Grade 10.9 vs 10.9S Bolts: Standards, Structural Assemblies and Selection Guide

Grade 10.9 vs 10.9S Bolts: Engineering Differences, Structural Standards and Correct Selection

An Engineering and Procurement Guide to ISO 898-1, EN 15048, EN 14399, HR/HV/HRC Systems and High-Strength Bolted Assemblies

Selecting high-strength bolts requires more than matching the numerical property class stamped on the bolt head.

In industrial machinery, steel construction, transportation equipment and heavy engineering,

 fasteners must be selected according to their mechanical properties, dimensional standards, 

joint design, installation method and applicable project requirements.

A common source of confusion is the difference between Grade 10.9 bolts and bolts described as Grade 10.9S.

Although these designations may appear similar, they should not be treated as universally interchangeable.

Property class 10.9 is an internationally recognized metric fastener strength classification covered by ISO 898-1.

By contrast, the meaning of 10.9S depends on the actual drawing, governing specification and market-specific marking convention. 

The letter S should not automatically be interpreted as a separate ISO mechanical property class or proof that the bolt is a European preloaded structural assembly.

For European steel construction, the relevant distinction is often between ordinary high-strength fasteners,

  EN 15048 non-preloaded structural bolting assemblies and EN 14399 high-strength structural bolting assemblies suitable for preloading.

Within EN 14399, different systems such as HR, HV and HRC have their own product requirements and installation considerations.

Juxin Fasteners supplies industrial fastening products and accepts drawing-based inquiries for high-strength bolts, nuts, washers and custom fastening components, subject to confirmation of the exact specification and supply capability.

This guide explains how design engineers, structural engineers, manufacturing engineers, production managers, purchasing specialists and supplier development teams can identify the correct bolt specification and avoid unsuitable substitutions.

What Does Grade 10.9 Mean?

Grade 10.9 is a metric mechanical property class defined by ISO 898-1 for applicable carbon steel and alloy steel bolts, screws and studs.

The numerical designation describes the fastener's strength classification.

For property class 10.9, the nominal values commonly used to explain the designation are:

• Nominal tensile strength: 1,000 MPa

• Nominal yield-strength ratio: 0.9

• Nominal yield-strength value: 900 MPa

These nominal designation values should not be confused with every minimum acceptance requirement in ISO 898-1.

For example, the standard specifies mechanical-property requirements and test conditions that depend on fastener size and other applicable factors.

Engineering Implication

A bolt marked 10.9 is not automatically approved for a particular structural joint.

Its dimensional specification, mating nut, washer arrangement, coating, installation procedure and applicable assembly standard must also be considered.

What Does 10.9S Mean?

The designation 10.9S appears in certain structural fastener specifications and purchasing documents.

However, it is not appropriate to assign one universal international definition to every product described as 10.9S.

The interpretation must be established from the governing specification.

Questions to Ask

• Which standard is cited on the drawing?

• Is the fastener intended for a preloaded or non-preloaded joint?

• Is the product supplied as a matched assembly?

• Does the bolt have a conventional hexagon head or a tension-control end?

• What head markings are required?

• Which nut and washer specifications apply?

• What tightening method is specified?

• What coating and lubrication conditions are required?

Important Engineering Principle

The marking 10.9S alone is not sufficient to establish equivalence with EN 14399 HR, HV or HRC assemblies.

A supplier should request the complete drawing and applicable standard before proposing a substitute.

Grade 10.9 Versus 10.9S: Practical Comparison

Why the Distinction Matters

The main procurement risk is assuming that identical numerical strength markings establish identical structural performance.

Two bolts may have comparable basic tensile properties but differ in:

• Head geometry

• Thread length

• Nut compatibility

• Washer requirements

• Tightening characteristics

• Coating

• Assembly testing

• Traceability

• Installation method

These differences can affect joint behavior and project compliance.

General High-Strength Bolts Under ISO Standards

Many industrial applications use Grade 10.9 hexagon bolts manufactured to internationally recognized dimensional and mechanical standards.

ISO 898-1

Defines mechanical and physical properties for applicable carbon steel and alloy steel bolts, screws and studs.

ISO 4014

Defines dimensions for hexagon head bolts with specified thread arrangements.

ISO 4017

Defines dimensions for hexagon head screws with full threads.

ISO 4032

Defines dimensions for regular hexagon nuts.

ISO 898-2

Defines mechanical properties for applicable nuts.

Engineering Consideration

A dimensional standard and a mechanical property standard serve different purposes.

ISO 4014 or ISO 4017 defines bolt geometry.

ISO 898-1 defines applicable mechanical properties.

Neither standard alone establishes that a bolt-and-nut combination is a qualified preloaded structural assembly.

Can Grade 10.9 Bolts Be Used in Steel Structures?

Yes, in suitable applications and where the governing design and assembly specifications permit.

It is incorrect to state that ordinary property class 10.9 bolts are categorically prohibited from structural steelwork.

For European steel construction, however, the required structural bolting assembly specification must be considered.

EN 15048

Covers structural bolting assemblies for non-preloaded applications.

EN 14399

Covers high-strength structural bolting assemblies suitable for preloading.

Important Distinction

A property class 10.9 bolt purchased individually is not automatically an EN 15048 structural bolting assembly or an EN 14399 preloaded assembly.

The appropriate assembly must meet the requirements of the governing standard.

EN 15048: Non-Preloaded Structural Bolting Assemblies

EN 15048 applies to structural bolting assemblies for non-preloaded applications within its scope.

These assemblies are used where the structural design does not require the specified controlled preloading associated with preloaded structural joints.

Potential Applications

• Selected steel building connections

• Industrial support structures

• Non-preloaded structural connections

• Equipment support steelwork

Actual suitability depends on the structural design and applicable project requirements.

Important Procurement Requirement

The required structural bolting assembly must be specified and supplied in accordance with the relevant standard.

Purchasing a bolt and nut separately by nominal size and property class does not automatically establish EN 15048 assembly conformity.

EN 14399: High-Strength Structural Bolting Assemblies for Preloading

EN 14399 addresses high-strength structural bolting assemblies suitable for preloading.

The standard series includes requirements for complete assemblies and defined component systems.

The relevant components may include:

• Bolt

• Nut

• Washer or washers

• Specified coating and lubrication condition

• Required identification and traceability

Why Assembly-Level Control Matters

Preloaded joints are sensitive to the relationship between tightening input and the resulting bolt tension.

This relationship can be affected by:

• Thread friction

• Bearing surface friction

• Coating

• Lubrication

• Bolt geometry

• Nut geometry

• Washer condition

• Installation procedure

Engineering Principle

A qualified structural bolting assembly is more than a high-strength bolt supplied with an arbitrary nut.

HR, HV and HRC Structural Bolting Systems

European structural bolting practice includes different systems under EN 14399.

These systems must be identified individually.

System HR

System HR is covered by relevant parts of EN 14399, including EN 14399-3 for specified hexagon bolt and nut assemblies.

HR assemblies are designed to achieve the required structural preloading behavior through their specified bolt-and-nut system.

System HV

System HV is covered by EN 14399-4 for specified hexagon bolt and nut assemblies.

HV uses a different system design from HR.

System HRC

System HRC is covered by EN 14399-10 for specified bolt and nut assemblies with calibrated preload.

Certain HRC designs use a tension-control end and a dedicated installation method.

Critical Distinction

HR, HV and HRC are not simply alternative names for one bolt.

They are distinct structural bolting systems.

Their components should not be mixed without specific engineering authorization and compliance with the relevant requirements.

Why HR and HV Components Must Not Be Mixed

HR and HV systems use different design approaches to the behavior of the bolt-and-nut assembly.

Their specified nut geometry, bolt characteristics and deformation behavior are not necessarily identical.

Potential Risks of Mixing Components

• Incorrect assembly behavior

• Changed tightening characteristics

• Reduced reliability

• Failure to meet the specified structural assembly requirements

• Rejection during project inspection

Procurement Rule

A supplier should identify the complete HR or HV system rather than quote a generic bolt, nut and washer based only on nominal dimensions.

What Are HRC Tension-Control Bolts?

HRC structural bolting assemblies are covered by EN 14399-10.

The standard addresses specified high-strength structural assemblies suitable for preloaded joints.

The published scope includes property class 10.9/10 assemblies with thread sizes M12 to M36.

Tension-Control Installation

Certain HRC systems use a dedicated tightening tool that interacts with the bolt's tension-control end.

During the specified installation process, the end may separate when the designed tightening condition is reached.

Important Limitation

A separated tension-control end is not, by itself, proof that every structural preload requirement has been satisfied.

The approved installation sequence, assembly condition, tool operation and inspection requirements must all be met.

Are All 10.9S Bolts Tension-Control Bolts?

No universal conclusion can be made from the designation alone.

A drawing marked 10.9S must be checked against its referenced standard.

Similarly, not all EN 14399 structural bolting systems use a tension-control end.

Engineering Recommendation

Confirm the actual system before selecting the installation tool or preparing a quotation.

Mechanical Properties and Structural Performance

Basic bolt strength is important, but structural connection performance depends on more than tensile strength.

Relevant Properties

• Tensile strength

• Yield strength

• Proof-load behavior

• Hardness

• Ductility

• Thread integrity

• Fatigue behavior

• Fracture characteristics

Important Qualification

The exact mechanical acceptance requirements depend on the applicable product standard and assembly system.

A universal impact toughness requirement should not be assigned to every bolt described as 10.9S.

Why Material Grade Alone Is Not Enough

Different steel compositions and manufacturing processes may be capable of producing fasteners with a specified mechanical property class.

However, the chemical composition, heat treatment, hardenability and other material requirements must comply with the actual product specification.

Engineering Rule

Do not identify a structural bolt as compliant merely because it is made from an alloy steel commonly associated with high-strength fasteners.

The complete product must meet the governing requirements.

Structural Joint Design: Bearing-Type Versus Slip-Resistant Connections

Structural steel connections can transfer loads through different mechanisms.

Bearing-Type Connections

Load transfer may involve contact between the bolt shank and the connected material after relative movement reaches the bearing condition.

Slip-Resistant Connections

These rely on the specified resistance to slip at the connected surfaces under the applicable design conditions.

Important Engineering Distinction

Not every structural bolted joint requires a slip-resistant design.

Not every high-strength bolt must be installed as a preloaded structural assembly.

The structural engineer determines the connection category and corresponding requirements.

Eurocode 3 and Structural Bolted Joint Design

EN 1993-1-8 provides design rules relevant to joints in steel structures.

It addresses structural connection behavior and associated design requirements.

Design Considerations

• Bolt diameter

• Bolt strength

• Joint geometry

• Plate thickness

• Hole type

• Edge distance

• Bolt spacing

• Shear and tension

• Slip resistance

• Fatigue where applicable

Important Limitation

A fastener catalog cannot replace the structural design calculations required for the project.

Preload: Why It Matters

Preload is the tensile force established in the bolt during tightening.

In a preloaded structural connection, the specified preload contributes to the intended joint behavior.

Relevant Factors

• Bolt tensile stress area

• Fastener mechanical properties

• Tightening method

• Friction

• Surface condition

• Joint geometry

• Installation sequence

Engineering Principle

The tightening procedure must be compatible with the approved bolting assembly and structural design.

Torque and Preload Are Not the Same

Tightening torque is the rotational moment applied during installation.

Preload is the resulting axial force in the bolt.

The relationship between them depends significantly on friction and assembly conditions.

Sources of Variation

• Thread surface finish

• Lubrication

• Coating

• Washer condition

• Nut geometry

• Installation speed

• Repeated tightening

Why This Matters for Procurement

A supplier substitution may change the torque-to-preload relationship even when the nominal bolt diameter and property class remain unchanged.

The K-Factor and Structural Bolting Assemblies

In structural bolting, tightening characteristics may be evaluated using specified test methods and assembly classifications.

The term k-factor is commonly associated with the relationship between applied tightening torque and achieved preload.

Important Engineering Consideration

A single generic k-factor should not be assumed for every Grade 10.9 bolt.

The appropriate tightening data must correspond to the actual assembly, surface condition and governing standard.

EN 14399-2

Provides suitability testing requirements for preloading of applicable structural bolting assemblies.

Procurement Implication

The buyer should request the required assembly-specific testing and documentation rather than relying solely on the bolt's material certificate.

Installation Methods for Structural Bolts

Depending on the structural system and project requirements, installation methods may include:

• Torque-controlled tightening

• Combined tightening methods

• Direct tension indication

• Approved tension-control systems

The permitted method must follow the governing installation specification.

EN 1090-2

Provides technical requirements for execution of steel structures, including relevant structural bolting installation requirements.

Important Distinction

An installation method approved for one bolting assembly should not automatically be transferred to another system.

Tension-Control Installation and Visual Inspection

Certain tension-control systems provide a visible change during final tightening.

This may help installers identify completion of a particular installation operation.

However, the visible condition must be interpreted within the approved procedure.

Required Controls May Include

• Correct assembly identification

• Suitable installation tool

• Defined tightening sequence

• Correct surface condition

• Inspection of the completed connection

• Project-specific acceptance criteria

Production Engineering Principle

Visual installation indicators are useful only when the complete process is controlled.

Why Coatings Matter for Grade 10.9 Structural Bolts

Surface treatment affects corrosion resistance and can influence tightening behavior.

Potential coating systems include:

• Zinc-based coatings

• Zinc-flake coatings

• Zinc-nickel coatings

• Other specified protective systems

• Uncoated or otherwise treated surfaces where permitted

Important Limitation

No single coating should be described as mandatory for every bolt designated 10.9S.

The permitted coating depends on the applicable standard, approved assembly and project specification.

Hydrogen Embrittlement Risk

High-strength steel fasteners can be sensitive to hydrogen-assisted cracking under certain conditions.

Relevant factors may include:

• Material strength

• Manufacturing process

• Surface treatment

• Hydrogen exposure

• Applied tensile stress

• Environmental conditions

ISO 4042

Provides requirements relevant to electroplated coating systems for fasteners, including provisions associated with hydrogen embrittlement risk.

Engineering Recommendation

High-strength fastener coating selection should consider both corrosion protection and hydrogen embrittlement control.

A coating change must not be treated as a purely cosmetic modification.

Why a Stronger Bolt Is Not Always a Better Bolt

Increasing fastener strength may create new engineering concerns.

Potential Considerations

• Ductility

• Hydrogen embrittlement susceptibility

• Nut compatibility

• Joint stiffness

• Fatigue

• Tightening control

• Cost

Engineering Principle

The correct bolt is the one that satisfies the complete joint requirements, not necessarily the bolt with the highest nominal tensile strength.

Washer Selection in Structural Assemblies

Washers influence bearing conditions and may be part of the specified structural assembly.

Relevant Factors

• Washer dimensions

• Material hardness

• Bearing surface

• Chamfer orientation

• Coating

• Assembly system

EN 14399-5 and EN 14399-6

Address specified washer configurations for structural bolting assemblies.

Important Procurement Rule

A generic washer of the same nominal diameter should not automatically replace a washer specified as part of an EN 14399 assembly.

Thread Length and Grip Length

The relationship between bolt length, thread length and connected material thickness can influence joint behavior.

Relevant Variables

• Bolt nominal length

• Grip length

• Thread engagement

• Nut position

• Washer thickness

• Thread runout

• Installation accessibility

Engineering Recommendation

Select the bolt length using the actual assembly geometry and the governing structural bolting specification.

Thread Standards and International Compatibility

ISO Metric Threads

Common metric designations include:

• M12 × 1.75

• M16 × 2.0

• M20 × 2.5

• M24 × 3.0

These are examples of metric thread designations, not confirmation that each configuration is available for every structural assembly system.

Unified Inch Threads

Examples include:

• 1/2-13 UNC

• 5/8-11 UNC

• 3/4-10 UNC

Important Distinction

Metric and UNC/UNF thread systems are not directly interchangeable.

BSW and BSF are also distinct thread systems.

ASTM Structural Bolts Are Not Direct EN 14399 Equivalents

North American steel construction commonly uses structural bolting specifications different from European EN 14399 systems.

ASTM F3125/F3125M

Covers specified high-strength structural bolt grades, including grades associated with the historical A325 and A490 designations.

Engineering Consideration

ASTM structural bolt grades and European property class 10.9 structural bolting systems must not be treated as direct substitutes based only on strength.

Differences may include:

• Dimensions

• Thread specifications

• Mechanical properties

• Nut requirements

• Washer requirements

• Coatings

• Testing

• Installation procedures

Procurement Recommendation

For projects involving both European and North American suppliers, establish the governing standard before requesting cross-reference quotations.

Typical Applications for General Grade 10.9 Bolts

Property class 10.9 bolts may be used in suitable:

• Industrial machinery

• Mechanical equipment

• Power transmission assemblies

• Manufacturing equipment

• Material-handling systems

• Automotive-related components

• Heavy industrial equipment

Engineering Requirements

• Bolt strength

• Joint loading

• Nut compatibility

• Tightening method

• Corrosion environment

• Fatigue

• Maintenance

Important Qualification

Safety-critical automotive and transportation applications require the responsible manufacturer's approval.

Typical Applications for Preloaded Structural Bolting Assemblies

Approved structural bolting systems may be used in suitable:

• Steel building structures

• Bridges

• Industrial steel frameworks

• Heavy equipment support structures

• Certain infrastructure connections

• Selected energy infrastructure

Engineering Requirements

• Structural design category

• Preload

• Slip resistance where required

• Installation method

• Assembly compatibility

• Inspection

• Traceability

Important Limitation

The application alone does not determine whether an HR, HV or HRC assembly is required.

The project drawing and governing specification control the selection.

Wind Energy and Heavy Equipment Structures

Wind energy equipment and heavy industrial structures may use high-strength bolted connections.

However, not all such applications are governed by EN 14399.

Specialized flange connections, equipment manufacturer specifications and other joint-design requirements may apply.

Engineering Recommendation

Do not automatically propose structural steelwork bolts for wind turbine flange joints or other highly specialized connections.

Railway Infrastructure and Rolling Stock

Railway projects may contain structural steel connections and specialized mechanical assemblies.

Infrastructure Applications

Some steelwork may be designed under applicable structural construction standards.

Rolling Stock Applications

Vehicle assemblies may follow separate railway OEM and component specifications.

Important Distinction

A bolt approved for a steel bridge connection is not automatically approved for a railway bogie or wheelset.

Manufacturing Engineering: Consistent Bolt Assembly Performance

High-strength structural bolting requires control of both product characteristics and installation conditions.

Potential Manufacturing Controls

• Material identification

• Heat treatment

• Thread production

• Dimensional inspection

• Coating

• Assembly matching

• Functional testing

• Packaging

• Traceability

Production Manager Priorities

• Stable process quality

• Rejection rates

• Tool compatibility

• Batch identification

• Installation consistency

• Production scheduling

• Delivery reliability

Important Supplier Boundary

These are recommended evaluation criteria, not a claim that every Juxin Fasteners product has already undergone every listed test or certification.

Inspection and Quality Documentation

The required documentation depends on the actual product and project.

Potential Requirements

• Material certificate

• Mechanical test report

• Dimensional inspection

• Coating report

• Assembly suitability testing

• Preload-related test documentation

• Batch identification

• Manufacturer identification

• Customer-specific approval

Important Distinction

An ISO 898-1 mechanical-property report is not equivalent to complete EN 14399 assembly qualification.

Supplier Qualification for Structural Bolting

Procurement development teams should verify the supplier's ability to deliver the specified product or assembly.

Technical Qualification

• Governing standard

• Product system

• Thread designation

• Property class

• Dimensions

• Coating

• Mating components

• Required testing

Quality Qualification

• Traceability

• Inspection

• Test reports

• Change control

• Applicable certification requirements

Commercial Qualification

• MOQ

• Sample quantity

• Volume pricing

• Production lead time

• Packaging

• Delivery schedule

• Supply continuity

Why Second-Source Approval Is Important

A substitute bolt may appear identical to the original component.

However, differences in coating, lubrication, nut design or washer selection may change assembly performance.

Engineering Principle

A second source must be qualified against the actual assembly requirements.

Nominal dimensional similarity is insufficient.

Common Selection Errors

Information Gain: A Practical Bolt Substitution Decision Framework

Before approving a substitute high-strength bolt, evaluate the following sequence.

Identify the Governing Standard

Determine whether the project requires ISO 898-1, EN 15048, EN 14399, ASTM F3125 or another specification.

Identify the Joint Function

Determine whether the connection is non-preloaded, preloaded or slip-resistant under the governing design.

Identify the Complete Assembly

Confirm the bolt, nut, washer, coating and lubrication requirements.

Verify the Mechanical Properties

Review the applicable property class and test requirements.

Review the Installation Method

Confirm torque, combined tightening, direct tension indication or another approved method.

Confirm Testing and Documentation

Verify that the supplier can provide the documentation required by the project.

Obtain Engineering Approval

Do not release an alternative product for a safety-critical or regulated structural application before the responsible engineering authority approves it.

Why Total Installed Cost Matters

The lowest unit price does not necessarily produce the lowest project cost.

Relevant Cost Factors

• Bolt price

• Nut and washer price

• Assembly packaging

• Coating

• Installation tools

• Tightening time

• Inspection

• Testing

• Rework

• Supplier qualification

• Logistics

Procurement Insight

The correct comparison is the cost of an approved and correctly installed bolting assembly, not merely the price of a single bolt.

Juxin Fasteners: Industrial High-Strength Fastener Supply

Juxin Fasteners supports international industrial customers with standard and drawing-based fastening requirements.

Relevant inquiry categories may include:

• Property class 10.9 bolts

• High-strength hexagon bolts

• Compatible high-strength nuts

• Washers

• Drawing-based custom fasteners

• Project-specific structural bolting assembly inquiries

Important Product Qualification

Availability of a general Grade 10.9 bolt does not establish that a complete EN 14399 HR, HV or HRC structural assembly is available or certified.

Specialized structural assemblies, including tension-control designs, must be individually confirmed before quotation.

Commercial Approach

Juxin Fasteners welcomes technical inquiries and can review the customer's drawings, product specifications, quantities and documentation requirements.

The quotation process should establish:

• Exact product designation

• Applicable standard

• Required dimensions

• Mechanical properties

• Coating

• Mating components

• Testing

• Documentation

• Order quantity

• Delivery requirements

Frequently Asked Questions

What is the difference between Grade 10.9 and 10.9S bolts?

Grade 10.9 is a defined metric mechanical property class under ISO 898-1. The meaning of 10.9S must be established from the governing product specification and drawing.

Does S always mean a tension-control structural bolt?

No. The suffix alone does not establish the complete structural system or installation method.

Are 10.9 and 10.9S bolts interchangeable?

Not automatically. The applicable standards, dimensions, assembly components and installation requirements must be verified.

Are all EN 14399 bolts tension-control bolts?

No. EN 14399 includes HR, HV and HRC systems with different configurations.

What is the difference between HR and HV bolts?

They are different structural bolting systems with distinct assembly requirements and design characteristics.

What is an HRC bolt?

An HRC bolt is part of a specified EN 14399-10 structural bolting assembly with calibrated preload characteristics.

Can an ordinary Grade 10.9 bolt be used in structural steelwork?

It may be used where the approved structural assembly and project requirements permit. In European non-preloaded structural applications, EN 15048 may apply.

What is the difference between EN 15048 and EN 14399?

EN 15048 covers non-preloaded structural bolting assemblies. EN 14399 covers high-strength structural bolting assemblies suitable for preloading.

Do Grade 10.9 and 10.9S bolts always have identical mechanical properties?

This cannot be assumed without identifying the applicable 10.9S specification.

Do structural bolts always require a specific coating?

No universal coating requirement applies to every structural bolt. The coating must comply with the relevant assembly and project requirements.

Does a tension-control bolt automatically achieve the correct preload when the end breaks off?

Not automatically. The full approved installation and inspection procedure remains necessary.

Can EN 14399 components be mixed between suppliers?

The complete assembly and its compatibility must satisfy the governing standard. Components should not be mixed merely because they have the same nominal dimensions.

Can ASTM F3125 bolts replace EN 14399 bolts?

Not without a formal engineering review and approval of the complete specification differences.

What information is needed to quote Grade 10.9 or structural bolts?

The supplier needs the drawing, governing standard, bolt dimensions, thread, material and mechanical requirements, coating, mating components, testing requirements and purchasing quantities.

OEM RFQ — Grade 10.9 Bolts and Structural Fastening Assemblies

Juxin Fasteners welcomes inquiries from industrial machinery manufacturers, steel structure fabricators, infrastructure equipment suppliers, mechanical engineers, structural engineers, manufacturing engineers, production managers, purchasing specialists and supplier development teams.

For technical review and quotation, please provide the following information where applicable.

Product Specifications

• 2D engineering drawing

• 3D CAD model

• Applicable product standard

• Grade 10.9 or specified 10.9S designation

• Required HR, HV, HRC or other assembly system

• Bolt diameter

• Thread pitch

• Bolt length

• Thread length

• Head type

• Required markings

Mating Components

• Nut specification

• Washer specification

• Assembly system

• Required coating

• Lubrication condition

• Packaging configuration

Structural and Installation Requirements

• Preloaded or non-preloaded joint

• Required preload

• Tightening method

• Slip-resistance requirements

• Applicable execution standard

• Installation tooling

• Inspection criteria

Quality and Documentation

• Mechanical-property testing

• Dimensional inspection

• Coating requirements

• Assembly suitability testing

• Traceability

• Material documentation

• Customer-specific approval

• Applicable conformity documentation

Commercial Requirements

• Prototype quantity

• Sample quantity

• Initial order quantity

• Estimated annual demand

• MOQ expectations

• Volume pricing

• Delivery schedule

• Packaging requirements

Request a High-Strength Bolt Quotation

Whether your project requires industrial Grade 10.9 bolts, compatible nuts and washers or a specified structural bolting assembly, 

Juxin Fasteners welcomes your technical inquiry.

For regulated structural applications, the exact assembly standard, 

required conformity documentation and approved installation method must be confirmed before supply.

Company: Juxin Fasteners

Website: https://www.juxinfasteners.com/

Email: info@juxinfasteners.com

Send your drawings, standards, assembly requirements and estimated order quantities to request technical review, sample evaluation or an OEM quotation.

Correct structural bolt selection depends on the complete approved bolting assembly—not just the numerical strength class stamped on the bolt head.