Hex Bolts/Screws
| PROPERTY CLASS | 10.9 |
|---|---|
| Size | M4 to M80 |
| TENSILE STRENGTH | 1040N / mm2 min |
| STANDARD | ISO 4017 (Full Thread) ISO 4014 (Half Thread) |
Industrial fastening, specified properly
Hex bolts selected for the joint, not just the diameter
A hex bolt may look like one of the simplest parts in a bill of materials, yet it carries several decisions at once: diameter, length, thread pitch, threaded length, property class, material, finish, mating nut, washer arrangement and inspection requirement. When even one of those details is assumed, a bolt that physically enters the hole can still be wrong for the load, environment or installation method.
Shree OSR Enterprises supplies metric hex bolts and hex-head screws for industrial maintenance, equipment assembly, fabrication, construction and project procurement. The listed range is M4 to M80, with property class 10.9 highlighted for high-strength requirements. Full-thread options are referenced to ISO 4017, while partial-thread hex bolts are referenced to ISO 4014. Availability in other materials, property classes and finishes should be confirmed against the exact enquiry rather than inferred from a generic product name.
This page is designed to help engineers, contractors, fabricators, OEM buyers and purchase teams prepare that enquiry. It explains where full and partial threads differ, what class 10.9 does—and does not—tell you, how finish affects procurement, and which information allows an accurate comparison between quotations. If you are still defining the joint, start with the practical industrial fastener selection guide. If the specification is ready, send it for an itemised commercial response.
Product scope at a glance
Read the listing as a starting specification
The values below reproduce the scope published for this product, but a purchase order should never rely on the headline alone. Diameter and length availability, thread pitch, coating, lot documentation and the applicable edition of a standard must be agreed in the quotation.
Metric size
M4–M80
Nominal diameter range shown on the current Shree OSR Enterprises product listing.
Highlighted strength
Class 10.9
High-strength carbon or alloy steel category; match nuts and washers to the joint specification.
Full thread
ISO 4017
Hexagon-head screw format with threads extending substantially along the shank for the specified length.
Partial thread
ISO 4014
Hexagon-head bolt format with an unthreaded shank portion, depending on diameter and nominal length.
Thread coverage and joint behaviour
ISO 4014 or ISO 4017: the visible difference matters
In everyday trade, both products are often called “hex bolts.” The formal standard names are more precise: ISO 4014 covers hexagon-head bolts with a partial thread, while ISO 4017 covers hexagon-head screws that are normally threaded along the available shank. The better choice is determined by the grip length, shear plane, adjustment need and assembly design—not by a preference for one catalogue label.
Partial-thread hex bolt
A defined unthreaded shank remains between the head and the threaded portion when the selected diameter and length provide it. Designers may use that smooth shank through the clamped materials or across a shear plane.
- Useful when the grip length is known and an unthreaded bearing section is required.
- Thread length is standardised; “half thread” is only a shop-floor shortcut and should not be interpreted literally.
- The nut must achieve sufficient thread engagement without running into the incomplete thread or shank.
Full-thread hex-head screw
Threads extend from near the head across the usable shank length, subject to the standard’s end and under-head details. This gives the installer more freedom to position the nut across varying stack thicknesses.
- Practical for thinner assemblies, variable grip lengths and general equipment fastening.
- Thread roots can lie within a shear plane, so the joint designer must account for the relevant tensile-stress or minor-diameter area.
- Extra thread does not automatically mean a stronger joint; load path and preload remain decisive.
| Selection point | ISO 4014 partial thread | ISO 4017 full thread |
|---|---|---|
| Grip control | Select length so the smooth shank passes through the intended grip without preventing nut tightening. | Accommodates a wider range of stack thicknesses because the nut can travel along more of the shank. |
| Shear plane | Can keep threads out of the shear plane when the joint is deliberately dimensioned that way. | Threads may be present at the shear plane; use the correct design area and code provisions. |
| Adjustment | Less adjustment range once the nut approaches the end of the standard thread. | Greater axial adjustment for brackets, slots and changing component thickness. |
| Ordering risk | Wrong grip or thread length can cause the nut to stop before the joint is clamped. | Assuming “fully threaded” without a standard can still produce differences near the head and point. |
| Best enquiry wording | “ISO 4014, M__ × __ mm, pitch, class, finish, quantity.” | “ISO 4017, M__ × __ mm, pitch, class, finish, quantity.” |
Measure length correctly. For a standard hex-head bolt or screw, nominal length is generally measured from the bearing face under the head to the end, not over the head. A drawing should take precedence where a special point, reduced shank or non-standard head is involved.
Do not mix dimensional and mechanical standards. ISO 4014 or ISO 4017 establishes the product geometry. A property class such as 10.9 is governed through the applicable mechanical-property specification. Material, coating, nut class and test documentation are separate lines in a complete purchase description.
What property class 10.9 tells the buyer
The two-number marking is a mechanical-property designation for metric steel fasteners. It is valuable, but it is not a complete material, coating, dimensional or installation specification.
A strength category—not a brand or steel grade
Class 10.9 identifies a high-strength set of mechanical requirements for carbon- or alloy-steel bolts, screws and studs when evaluated under the applicable fastener standard. The first number relates to nominal tensile-strength level; the second expresses the relationship between yield or proof behaviour and tensile strength. Exact acceptance values can vary with diameter, thread and the edition of the governing specification, so an inspection plan should cite that document rather than relying on an internet torque table.
The product listing currently states a tensile-strength value of 1040 N/mm² minimum. Put any mandatory minimum, test method, sample frequency and certificate requirement directly on the enquiry so supplier and buyer are evaluating the same criterion.
Strength and corrosion resistance are different decisions
Heat treatment can create the required mechanical performance, but it does not make carbon or alloy steel corrosion-proof. A plain or black class 10.9 bolt can still rust in moisture. Zinc plating, zinc-flake systems and hot-dip galvanizing are protective options with different coating thicknesses, friction behaviour, dimensional allowances and application limits. Stainless steel uses a separate grade and property-class system; “stainless 10.9” should not be used as casual replacement wording.
For a side-by-side material decision, use the internal guide to MS, HDG, stainless and heat-treated fasteners, then state the chosen material and finish independently in the RFQ.
The assembly is a system
A class 10.9 bolt should not be paired with an unspecified soft nut or washer simply because the thread fits. The mating nut must have an appropriate property class and thread tolerance. Washers need suitable dimensions and hardness for the bearing pressure and joint design. Coatings on all components must be compatible so thread fit, tightening behaviour and corrosion performance remain controlled.
- Specify bolt, nut and washer standards as separate items.
- Confirm whether components are supplied as a tested assembly or as individual commercial parts.
- For structural preloaded joints, use the project’s approved bolting system and installation procedure; do not substitute a generic ISO hex bolt without engineering approval.
Important coating caution for high-strength steel
Some electroplating and pickling routes can introduce hydrogen into high-strength steel, creating a risk of delayed brittle failure if the process and post-treatment are not properly controlled. That does not mean every zinc-finished class 10.9 fastener is unacceptable. It means the coating process, applicable specification, de-embrittlement controls and supplier documentation matter. When the consequence of failure is high, have the coating route reviewed by the responsible engineer and require the agreed records.
When class 10.9 may be the wrong answer
Higher strength is not automatically better. A lower property class can be more appropriate for a non-critical general assembly, while stainless steel may be selected for corrosion resistance even though its marking system is different. Elevated temperature, very low temperature, fatigue, vibration, pressure service, aggressive chemicals and fire design can all demand requirements outside a general class 10.9 description. Start with the joint duty, then select the fastener. The procurement-team fastener checklist can help capture those conditions before quotation.
Material and surface protection
Choose the finish from the exposure—not the colour
Black, silver or grey appearance is not a reliable specification. Two bolts can look similar while using different base metals, coating thicknesses, passivation systems and friction characteristics. Define the service environment and required life first, then name the permitted material or finish standard.
Plain, black or lightly protected steel
Plain or black-finish carbon and alloy steel is often used in dry machinery, fabricated assemblies and controlled indoor environments. It can be economical and keeps coating buildup out of the thread, but storage oil or a dark surface should not be mistaken for long-term corrosion protection.
- State the property class and whether surface oil is permitted.
- Use suitable packaging and dry storage to limit transit and shelf corrosion.
- Do not specify “MS” alone when a defined high-tensile class is required.
Electroplated zinc
Zinc plating can provide a neat, controlled coating for indoor and mildly exposed service. The specification should identify coating type, thickness or service requirement, passivation colour where relevant, and any restrictions for high-strength steel. Tightening behaviour changes with coating and lubricant, so torque cannot be transferred blindly from a plain fastener.
- Confirm thread fit after coating, especially at larger thicknesses.
- Address hydrogen-embrittlement controls for susceptible high-strength components.
- Request corrosion-test performance only when the project defines the method and acceptance value.
Hot-dip galvanized (HDG)
HDG applies a substantially thicker zinc layer and is frequently selected for outdoor steelwork, utilities and construction. That thickness affects thread dimensions: the bolt-and-nut system needs the correct allowance and compatible tapping practice. An HDG bolt should be quoted with its matching nut and washer specification, not treated as a plain bolt that can be dipped after any nut is selected.
- Confirm the galvanizing standard and coating mass or thickness requirement.
- Keep mating components compatible in finish and dimensional allowance.
- See the related HDG bolt, nut and washer range.
Stainless steel
Stainless steel can offer corrosion resistance without a sacrificial zinc layer, but “SS” is incomplete. Grade, property class, finish, exposure, chloride level and risk of galling all matter. Austenitic stainless grades do not use the carbon-steel 8.8/10.9 marking system. Where stainless is required, quote the stainless designation and mechanical class together.
- Use the stainless-steel bolt, nut and washer page for a compatible set enquiry.
- Consider anti-galling controls, clean tools and approved lubricant where specified.
- Avoid mixing metals without reviewing galvanic-corrosion conditions.
Finish input for the RFQ
Replace “silver finish” or “rust-proof” with measurable procurement language.
Zinc-flake and specialist coatings: where low coating thickness, controlled friction or high corrosion performance is required, a zinc-flake or other engineered system may be considered subject to availability and project approval. State the coating specification, topcoat, colour, friction range and curing limitations rather than using a brand name alone.
Painted assemblies: if the completed joint will be painted, define whether fasteners arrive coated, receive site touch-up or remain masked. Paint over a joint does not correct poor base-metal preparation, and paint inside threads can prevent proper assembly.
Mixed environments: coastal chloride, chemical splash, continuous condensation, buried service and high temperature need separate engineering review. A finish that performs in a dry warehouse may fail quickly at a wet exterior interface.
Commercial comparison: compare quotations on the same finish system. A lower piece price based on a thinner or undefined coating is not an equivalent offer. When alternatives are allowed, ask suppliers to identify the deviation instead of silently accepting “nearest available.”
From hole to purchase description
Six checks before selecting diameter and length
A familiar size such as M10 × 50 is still incomplete. “M10” identifies nominal thread diameter; it does not state pitch, tolerance, strength, finish or whether 50 mm gives the right grip and thread engagement for the assembly.
Define the load path
Record whether the bolt primarily carries tension, shear, a combination, fatigue or an imposed preload. Identify prying, eccentricity and dynamic effects rather than selecting diameter only from machine familiarity.
- Use the governing design code or responsible engineer.
- Do not size a safety-critical joint from a generic chart.
Measure the grip
Add the actual thickness of every clamped component, including permanent washers, shims and brackets. For partial-thread bolts, position the standard unthreaded shank deliberately.
- Account for tolerance buildup.
- Avoid an unthreaded shank that prevents the nut from clamping.
Name the thread
Metric coarse pitch may be the default within ISO 4014/4017, but the purchase description should remove doubt. Fine pitch, left-hand threads and special tolerance classes require an explicit standard or drawing.
- State nominal diameter and pitch.
- Confirm mating internal thread and any coating allowance.
Check access and head clearance
Verify that a socket or spanner can reach the six-sided head and that the bearing surface is adequate. Nearby flanges, channel lips, welds and equipment housings can make a standard head impossible to tighten.
- Check width across flats and turning radius.
- Use an approved alternate head only after design review.
Plan thread engagement
The nut needs sufficient complete thread engagement without bottoming, running off the end or sitting on incomplete threads. Engagement rules depend on the materials, thread strength and joint design.
- Include washer thickness in the stack.
- Confirm projection limits where exposed threads create a snag or clearance risk.
Close the tolerance loop
Hole diameter, slot geometry, bolt straightness, thread tolerance, coating and component alignment all affect fit-up. Large or coated fasteners deserve a trial assembly when the interface is tight.
- Do not force mismatched threads.
- Escalate repeat fit problems instead of reworking bolts on site.
Write the requirement in one line
This pattern gives the supplier enough information to identify an equivalent item or clearly list deviations.
ISO 4014 hex bolt — M20 × 80 — coarse pitch — class 10.9 — specified finish — matching nut/washer — quantity — certificate requirement
Coarse versus fine pitch
Coarse threads are common, more tolerant of minor damage and usually faster to assemble. Fine threads offer different adjustment and stress-area characteristics but are more sensitive to damage and cross-threading. ISO 4014 and ISO 4017 are coarse-pitch dimensional standards; fine-pitch hex products use different standards. Never request “ISO 4017 fine thread” without resolving that conflict.
Bolt, screw, stud or anchor?
A through-bolt with a nut is not interchangeable with a fastener installed into a tapped hole, and neither replaces an anchor designed for concrete. For post-installed base-material connections, compare heavy-duty anchors, wedge anchors or Rawl bolts according to the approved application.
Where hex bolts are used
One head form, very different operating conditions
Hex bolts are common because standard spanners and sockets can apply tightening force to the six-sided head. That convenience spans many industries, but it does not make the specifications interchangeable. Each application below introduces a different question that must be resolved before procurement.
Machinery and OEM assemblies
Machine frames, guards, drive units, brackets, bearing housings and service panels often use metric hex fasteners because they can be installed with conventional tools and replaced during maintenance. Repetition makes consistency important: a small change in head dimension, thread length or coating friction can affect an assembly station, automated feeder or torque programme.
Specification watch: lock the drawing revision, thread tolerance, coating, lubricant condition and approved tightening method. If the bolt enters a tapped component, confirm engagement in that component’s material rather than applying through-bolt rules.
Fabrication and general steelwork
Fabricated supports, frames, platforms and non-preloaded connections may use hex bolts for site-friendly assembly and disassembly. Hole condition, washer bearing area, paint system and exterior exposure can matter as much as nominal strength.
Specification watch: do not substitute a standard class 10.9 ISO bolt for an approved structural bolting assembly. Structural design codes can require dedicated bolts, nuts, washers, testing and installation controls.
Automotive and transport equipment
Vehicle bodies, trailers, material-handling equipment and ancillary assemblies may expose fasteners to vibration, fatigue, splash, salt and repeated service. Product approval is normally tied to a drawing or OEM specification.
Specification watch: capture fatigue duty, locking strategy, coating friction, traceability and replacement policy. Never treat a visually matching bolt as an automatic service replacement.
MEP supports and building services
Mechanical, electrical, fire-service and HVAC supports use bolts with channels, brackets, clamps and fabricated hangers. The installed environment can move from dry indoor plant rooms to humid roofs and external service zones.
Specification watch: coordinate bolt finish with channel, nut and washer finishes. For channel assemblies, also review the available slotted C channel and MS spring nut options.
Maintenance, repair and plant shutdowns
Maintenance teams frequently need to identify an existing fastener under time pressure. Diameter and length alone are insufficient: the removed bolt may have a fine pitch, special material, non-standard shank, controlled head marking or application-specific coating. Photograph the head marking, measure the pitch and retain an undamaged sample where practical.
Specification watch: separate “match the sample” from “supply an engineering equivalent.” If the original failed, investigate the joint, environment and installation history before reproducing it. A stronger replacement can move the failure elsewhere rather than solve the cause.
Hex bolts are not post-installed anchors
A standard hex bolt normally clamps components using a nut or internal machine thread. Fixing into concrete, solid masonry, hollow block or brick requires a correctly designed anchor system and verified base-material conditions. Read the guide to chemical versus mechanical anchors before choosing a fixing solely because it has a hex head.
Faster, comparable quotations
The 10-line hex bolt RFQ
A price per piece is meaningful only when every bidder is pricing the same product and service scope. Attach the drawing or project specification when one exists, and use these ten lines to remove the most common assumptions.
Product and standard
ISO 4014, ISO 4017 or exact drawing/specification with revision.
Diameter × length
Metric nominal diameter and under-head length for each line item.
Thread details
Coarse/fine pitch, right/left hand, tolerance and full/partial coverage.
Strength or grade
Property class 10.9 or other approved mechanical requirement.
Material
Steel type or stainless designation; do not use only a colour description.
Finish and lubrication
Coating standard, class/thickness, passivation and friction requirement.
Companion parts
Nut and washer standards, classes, finish and quantity per assembly.
Quantity and packing
Total pieces, call-off lots, labels, kit packing and preservation needs.
Quality documents
CoC, MTC, test report, traceability or third-party inspection, if required.
Delivery terms
Required date, delivery PIN code, project name and tax/commercial details.
For samples
State whether the sample is for dimensional approval, coating approval, functional trials or final production approval. A sample without acceptance criteria cannot close the specification.
For rate contracts
Share the size-wise forecast, release quantity, delivery frequency, price-validity expectation and inventory responsibility. Annual total alone does not describe the supply pattern.
For urgent shutdowns
Separate immediately acceptable stock from exact-specification replenishment. Record any temporary substitution approval in writing and preserve traceability to the installed location.
Evidence matched to risk
Decide the acceptance plan before dispatch
A certificate should support a defined requirement; it should not be requested as a vague substitute for one. Agree what will be checked, which document governs acceptance, how lots remain identifiable and who pays for additional inspection before the order is placed.
Approve specification
Freeze standard, size, class, finish, drawing revision and any project clauses.
Define the lot
Agree lot identification, sampling basis, traceability and segregation rules.
Inspect and document
Check agreed dimensions, threads, markings, finish and mechanical evidence.
Release and preserve
Verify labels, count, packaging, rust protection and document pack before shipment.
Typical receiving checks
The appropriate level depends on consequence, quantity and contract requirements.
- Purchase description, quantity, packaging and lot label.
- Head marking, diameter, nominal length and visible thread condition.
- Go/no-go thread gauging under the agreed standard and coating condition.
- Across-flats dimension, head height and thread length when critical.
- Finish appearance and specified coating evidence—not colour alone.
- Certificate identity linked to the delivered lot where traceability is required.
Documents to request only when needed
List the exact document type and information expected in the RFQ.
- Certificate of conformity to the purchase specification.
- Material or mechanical test certificate with defined test scope.
- Coating certificate, thickness results or corrosion-test report.
- Dimensional inspection report or first-article record.
- Heat/lot traceability and third-party inspection release.
- Country-of-origin, packing or project-specific declarations.
Good product, controlled installation
Protect the specification after it reaches site
Storage, handling and tightening can change joint performance. The responsible engineer’s method, project specification and equipment instructions always take priority; these points are a practical control list, not a universal installation procedure.
Do
- Keep fasteners dry, labelled and segregated by size, class, finish and lot. Retain protective packaging until needed.
- Inspect threads and bearing surfaces before assembly. Clean only by an approved method that does not remove or contaminate the coating.
- Use the specified nut and washer, confirm free thread engagement by hand and investigate binding before applying powered tools.
- Use calibrated equipment and the approved tightening sequence where preload matters. Record results when the quality plan requires it.
- Replace any component rejected by the project criteria, and protect exposed assemblies using the approved touch-up system.
Do not
- Mix visually similar grades or coatings in one bin, or identify class only from colour. Verify the marking and documentation.
- Force a nut over damaged, dirty or mismatched threads. Chasing a plated thread can remove protection and change tolerance.
- Reuse high-strength fasteners automatically. Reuse depends on the joint, tightening method, service history and governing specification.
- Apply oil, anti-seize or threadlocker unless the approved procedure accounts for its effect on friction and preload.
- Use a generic online torque value as final authority for a critical joint, especially after changing finish or lubricant.
Why this page does not publish a universal torque table
Torque is only an indirect route to bolt tension. The resulting preload changes with diameter, pitch, property class, nut condition, coating, lubrication, bearing surface, tool accuracy, reuse and tightening method. A single number attached to “M16 class 10.9” can be unsafe when those inputs are unknown. Use the project engineer’s validated procedure or the approved assembly supplier’s data, and confirm whether the value is dry, lubricated or coating-specific.
Commercial evaluation
Compare hex bolt quotations line by line
The lowest number in the price column is not necessarily the lowest procurement cost. When evaluating a hex bolts manufacturer or supplier in India, first confirm technical equivalence; then compare quantity breaks, documentation, packing, freight, taxes, lead time and exclusions on the same basis.
Technical compliance
Create a compliance column for every mandatory attribute. A quotation that repeats only “M20 × 80, 10.9” has not confirmed the complete requirement.
- Standard and revision
- Pitch and thread coverage
- Material, class and finish
- Nut, washer and document scope
Unit-price basis
Confirm whether the price is per piece, hundred pieces, kilogram, set or box. Check if nuts and washers are included and whether packing quantities create a rounding difference.
- Currency and tax basis
- Price validity
- Quantity-break threshold
- Tooling or testing charges
Minimum order and pack
A low piece rate can require more stock than the project needs. Compare minimum order quantity, standard box size, inner packing and mixed-size packing rules.
- MOQ per size/finish
- Full-box rounding
- Project kit or line-side pack
- Return or cancellation limits
Lead time and availability
Separate physical stock from stock subject to inspection or coating. A “ready” plain bolt may still need plating, matched nuts, testing, packing and dispatch documentation.
- Ex-stock quantity
- Production/coating time
- Inspection hold points
- Part and complete dispatch dates
Landed delivery cost
Freight, insurance, palletisation and remote-area charges can reverse the unit-price ranking, especially for heavy diameters and low-value bulk hardware.
- Dispatch point and delivery term
- Freight inclusion
- Weight and package count
- Transit damage responsibility
Risk and after-sales response
Record how deviations, shortages, certificate errors and rejected lots will be handled. A clear response route can be more valuable than a marginal purchase-price saving.
- Deviation approval method
- Replacement timeline
- Traceability retention
- Single technical contact
| Evaluation field | Bidder A | Bidder B | Decision rule |
|---|---|---|---|
| Standard / size / class | Record confirmed offer | Record confirmed offer | Reject or technically approve every deviation before comparing price. |
| Finish and coating control | Specification + evidence | Specification + evidence | Visual similarity is not equivalence; compare coating system and requirements. |
| Accessories | Nut/washer included? | Nut/washer included? | Normalise both offers to the same completed assembly. |
| Documents and inspection | Included / extra / excluded | Included / extra / excluded | Add the cost and time of every mandatory record or witness point. |
| Delivered quantity and cost | MOQ, freight, tax, total | MOQ, freight, tax, total | Compare total landed cost for the usable quantity, not an isolated piece rate. |
| Committed delivery | Dated line-item schedule | Dated line-item schedule | Use a confirmed dispatch/delivery date, not only “two to three weeks.” |
What changes the hex bolt price?
Diameter, length, thread form, property class, base material, coating, order quantity, custom drawing features, testing, certification, packing and delivery location all affect the final quote. Steel and coating input prices also change over time, so use a dated quotation with a stated validity period rather than a permanent “lowest price” claim.
Approve alternatives transparently
If the requested item is unavailable, an alternative standard, finish or pack may reduce lead time. The supplier should identify the difference, and the authorised technical owner should accept it before dispatch. The internal fastener procurement checklist provides a useful record for that review.
Internal technical library
Useful reading before finalising the RFQ
These guides support the product page without repeating it. Use them to align engineering, procurement and site teams around the same selection language.
What Are Industrial Fasteners?
Understand the roles of bolts, screws, studs, nuts, washers and anchors.
How to Choose the Right Industrial Fasteners
Work through load, material, thread, finish, environment and installation.
Industrial Fastener Selection Checklist
A practical handoff tool for procurement teams comparing technical offers.
MS vs HDG vs Stainless vs Heat-Treated
Separate base material, strength treatment and corrosion protection.
Hex bolt questions from buyers
Frequently asked questions
Use these answers to prepare the enquiry. Final suitability, availability and installation requirements must be confirmed for the actual joint.
What is the difference between a hex bolt and a hex-head screw?
Trade language often uses both terms for an externally threaded fastener with a six-sided head. In the standards used on this page, ISO 4014 describes a hexagon-head bolt with partial thread, while ISO 4017 describes a hexagon-head screw with threads along the available shank. In practice, specify the standard and thread coverage instead of relying on the noun alone.
What hex bolt sizes are listed by Shree OSR Enterprises?
The current commercial listing states M4 to M80. Availability is size-, length-, class-, material-, finish- and quantity-dependent. Current ISO 4014:2022 and ISO 4017:2022 cover coarse-pitch products through M64, so requirements from M68 to M80 need an alternative governing standard or approved drawing confirmed in the quotation.
Do you supply grade 10.9 hex bolts?
Property class 10.9 is the highlighted high-tensile option on this product listing. Send the standard, diameter × length, pitch, thread coverage, finish, quantity and document requirements so availability can be checked. “10.9” should be specified together with geometry and surface condition, not as a complete description by itself.
Is a 10.9 bolt always better than an 8.8 bolt?
No. Class 10.9 offers a higher mechanical-property category, but the correct class depends on joint design, mating components, preload, fatigue, environment and governing code. A higher-strength substitution can change ductility, tightening requirements and failure mode. Obtain engineering approval before changing the specified property class.
Can class 10.9 bolts be zinc plated or hot-dip galvanized?
Protective coatings may be possible, but the permitted process must be reviewed for the strength level and application. Electroplating routes require appropriate controls for hydrogen-embrittlement risk. HDG coating thickness affects thread fit and the mating nut. Specify the coating standard and require written confirmation of the process, dimensional allowance and documentation.
Can I order stainless-steel hex bolts as class 10.9?
Do not combine those terms casually. Corrosion-resistant stainless fasteners use stainless grade and property-class designations under their applicable specification, while 10.9 is associated with quenched-and-tempered carbon/alloy steel fasteners. State the required stainless grade, mechanical class, standard and environment. See the stainless bolt, nut and washer range for a related enquiry.
Should I choose full thread or partial thread?
Choose from the joint geometry and load path. Partial thread can place a smooth shank through the grip or shear plane when correctly sized. Full thread provides more nut adjustment across variable stack thickness. Check grip, standard thread length, shear-plane location and required engagement; neither form is universally stronger.
How is hex bolt length measured?
For a conventional hex-head bolt or screw, nominal length is normally measured from the bearing surface under the head to the end. The head height is not included. Special points, reduced shanks and drawing-specific parts may use additional dimensions, so the referenced standard or approved drawing controls.
Can I send an old bolt as a sample?
A sample helps identify diameter, pitch, head, length, markings and finish, but wear or corrosion can hide important details. State whether you need an exact replacement, a dimensional match or an engineered equivalent. For critical equipment, provide the OEM drawing or obtain design approval instead of reverse-engineering solely from a used part.
Do I need matching nuts and washers?
Most bolted assemblies do. The nut needs compatible thread, tolerance, property class and coating allowance. Washers must suit the bearing area, hardness and finish required by the joint. Request the items as a coordinated package when interchangeability matters. Review available plain washers and specify their standard separately.
What information is needed for a hex bolt price?
Provide product standard, diameter × length, pitch, full or partial thread, property class or material, finish, nut/washer scope, quantity, packing, certificate or inspection needs, delivery location and required date. Price changes with all of these inputs. A quote for “M16 bolt” is not comparable with one for a fully defined coated assembly.
Can standard hex bolts be used as concrete anchors?
Not by default. Concrete and masonry fixings need a designed anchorage mechanism, verified base material, edge distance, spacing, embedment, hole preparation and load approval. A hex-shaped head does not make a machine bolt an anchor. Review the wedge-anchor versus drop-in-anchor guide or submit the base-material application for suitable options.
Do you offer custom or non-standard hex bolts?
Send the controlled drawing, material specification, tolerances, finish, test requirements, annual and release quantities, sample requirement and delivery schedule for feasibility review. Do not assume that every non-standard diameter, length or head geometry is available. Any tooling, minimum order, approval sample, inspection and lead-time conditions should be stated in the quotation.
Can you supply hex bolts across India?
Shree OSR Enterprises presents itself as an industrial fastener supplier serving requirements across India. Share the delivery PIN code, quantity, pack size, required date and unloading or transport constraints so dispatch feasibility and commercial terms can be confirmed for the order.
Are all sizes from M4 to M80 available from stock?
The published range describes the overall commercial scope, not a promise that every combination of diameter, length, pitch, class and finish is continuously stocked. An M12 zinc-plated full-thread screw and an M72 partial-thread high-tensile bolt have very different sourcing and production conditions. Send a size-wise schedule for a live availability check. The quotation should separate ex-stock quantities from items requiring manufacture, heat treatment, coating, testing or special packing, and should give a dated dispatch commitment for each group.
What does a size such as M20 × 80 mean?
“M20” identifies a metric thread with 20 mm nominal diameter. “80” normally identifies the nominal length in millimetres, measured from under the hex head to the end. The notation does not reveal pitch, full or partial thread, class, material, finish or standard. Write the complete line as, for example, ISO 4014, M20 × 80, metric coarse pitch, class 10.9, approved finish, with the required nut, washer, quantity and documents.
Why can two quotations for the same hex bolt size differ significantly?
The bids may not cover equivalent products. One may include a defined coating, matching class nut, hardened washer, traceable test certificate, export packing and delivered freight; another may price only a plain loose bolt. Material route, heat treatment, coating thickness, order quantity, stock position, testing and delivery date also affect cost. Use the quotation-comparison section above to normalise both offers. Ask every bidder to state deviations instead of choosing from piece price alone.
Can hex bolts be labelled or packed project-wise?
Project, floor, equipment, assembly or size-wise packing may be requested subject to feasibility, quantity and commercial confirmation. Define the inner quantity, label fields, barcode or purchase-order reference, corrosion protection, maximum package weight and whether nuts and washers must be kitted with each bolt. Special packing adds handling and may change lead time, but it can reduce site sorting errors when the requirement is agreed before quotation.
Which certificates come automatically with an order?
Do not assume a standard document package. Certificate of conformity, material or mechanical test records, coating evidence, dimensional reports, heat or lot traceability and third-party release are different deliverables. State exactly what the project requires in the RFQ and ask the quotation to confirm inclusion, format, traceability, extra cost and lead-time impact. Documents requested after manufacture or dispatch may not be recoverable for the delivered lot.
Ready to request the correct hex bolt?
Send the standard, size, class, finish, quantity, documentation and delivery location. The more complete the input, the faster the technical and commercial comparison.