304 vs 316 Stainless Steel Fasteners: Industrial Material Selection and OEM Engineering Guide

304 vs 316 Stainless Steel Fasteners: How to Choose the Right Material for Industrial Applications

OEM Engineering Guide to A2/A4 Grades, Corrosion Resistance, Mechanical Properties, Fastening System Design and Industrial Procurement

Selecting between 304 and 316 stainless steel fasteners is not simply a question of choosing a lower-cost or higher-cost corrosion-resistant material.

For industrial OEM manufacturers, the correct material must be compatible with the entire fastening system.

That system may include a screw, bolt, nut, washer, blind rivet nut, self-clinching fastener, welded component, threaded insert or custom machined part.

Each component may experience different mechanical loads, environmental exposure, manufacturing processes and installation conditions.

A suitable stainless steel fastener specification must therefore consider:

• Material grade and chemical composition

• Mechanical property class

• General and localized corrosion resistance

• Chloride and chemical exposure

• Mating materials

• Joint geometry and load distribution

• Thread engagement

• Installation and production processes

• Surface condition and passivation

• Inspection requirements

• Material traceability

• Total lifecycle cost

For example, 316 stainless steel may be a better material candidate than 304 for certain coastal equipment installations.

However, changing only the screw to 316 may not solve corrosion problems if the joint contains incompatible aluminum components, 

trapped moisture or an unsuitable washer arrangement.

Likewise, changing from 304 to 316 does not automatically increase mechanical strength.

This guide explains how to select stainless steel materials for complete industrial fastening assemblies, with practical considerations for design engineers, manufacturing engineers, production managers, supplier development teams and global procurement departments.

Juxin Fasteners supports OEM customers with stainless steel fastening components and drawing-based industrial solutions.

What Is Stainless Steel and Why Does Material Grade Matter?

Stainless steels are iron-based alloys containing chromium and other elements that provide corrosion resistance under suitable conditions.

Chromium supports the formation of a protective passive surface film.

The stability of this film depends on:

• Alloy composition

• Surface condition

• Temperature

• Moisture

• Chloride concentration

• Chemical exposure

• Oxygen availability

• Joint geometry

Stainless steel is not immune to corrosion.

Its performance must be evaluated against the actual operating environment.

For many industrial fasteners, the two most familiar austenitic stainless steel materials are 304 and 316.

Other stainless steel families, including martensitic, ferritic and duplex grades, may be used when specific hardness, strength or corrosion requirements justify them.

304 Stainless Steel Fasteners: General Industrial Applications

304 stainless steel is widely used for industrial fastening components requiring a combination of corrosion resistance, formability and manufacturing practicality.

Typical 304-type applications include:

• Industrial machinery

• Indoor electrical cabinets

• Automation equipment

• Electronic equipment housings

• Noncritical automotive accessories

• General equipment brackets

• Selected outdoor assemblies

Advantages of 304 Stainless Steel

General Corrosion Resistance

304 provides useful corrosion resistance in many indoor and moderately exposed environments.

Manufacturing Flexibility

304 is suitable for a range of manufacturing methods, depending on the component design and material condition.

These may include:

• Cold forming

• Thread rolling

• Machining

• Selected welding processes

Manufacturing feasibility depends on component geometry, tooling and the specified material condition.

Material Cost

304 is often less expensive than 316.

Where the application does not require the additional localized corrosion resistance of 316, 304 can provide a more economical material choice.

Limitations of 304 Stainless Steel

304 may be vulnerable to localized corrosion in chloride-containing or otherwise aggressive environments.

Engineers should evaluate:

• Coastal exposure

• Deicing salts

• Cleaning chemicals

• Standing water

• Enclosed crevices

• Elevated temperature

Engineering Example: Indoor Electrical Cabinet

An indoor control cabinet operates in a relatively dry, controlled environment.

If the specified mechanical properties and corrosion requirements are satisfied, 304 stainless steel fastening components may be sufficient.

Selecting 316 without a defined environmental benefit may increase procurement cost unnecessarily.

316 Stainless Steel Fasteners: Corrosion-Resistant Solutions for More Demanding Environments

316 stainless steel contains molybdenum, which generally improves resistance to certain forms of localized corrosion compared with 304.

This is particularly relevant in many chloride-containing environments.

Potential applications include:

• Coastal industrial equipment

• Marine-related auxiliary hardware

• Outdoor electrical enclosures

• Selected chemical-processing equipment

• Food-processing machinery

• Industrial washdown equipment

• Certain liquid-cooling equipment accessories

Advantages of 316 Stainless Steel

Improved Resistance to Chloride-Related Pitting

316 generally provides improved resistance to localized pitting corrosion compared with 304 under many comparable conditions.

Improved Performance in Selected Chemical Environments

316 may provide better resistance to certain chemicals.

However, chemical compatibility must be checked for the actual substance, concentration and temperature.

Potential Lifecycle Benefits

Where corrosion is the principal failure risk, 316 may reduce maintenance or replacement requirements compared with an unsuitable 304 design.

These benefits must be evaluated rather than assumed.

Limitations of 316 Stainless Steel

316 is not universally suitable for:

• Continuous seawater immersion

• Stagnant chloride solutions

• Highly concentrated chloride environments

• All chemical-processing conditions

• Every elevated-temperature application

316 can still experience pitting, crevice corrosion, galvanic corrosion and stress corrosion cracking.

Engineering Example: Coastal Electrical Enclosure

An electrical enclosure is installed near the coast and exposed to airborne salt deposits.

316 may be preferred for evaluation over 304.

However, the complete design must also consider drainage, washer geometry, aluminum contact surfaces and maintenance requirements.

304 vs 316 Stainless Steel Fasteners: Engineering Comparison

Important Conclusion

316 is not automatically stronger than 304.

Its principal advantage in this comparison is improved resistance to certain corrosive environments.

What About 316L Stainless Steel Fasteners?

316L is a low-carbon variant of 316 stainless steel.

The reduced carbon content is relevant to certain manufacturing and corrosion considerations, particularly where welding or thermal exposure could otherwise contribute to sensitization.

However, 316L should not be presented as universally more corrosion-resistant than 316 in every environment.

For OEM fasteners, engineers should distinguish between:

• 316 material requirements

• 316L material requirements

• A4 fastener grade requirements

• Mechanical property class

• Component manufacturing process

A drawing that specifies 316L must be reviewed against the actual material and component requirements.

304, 316 and 316L: Why Material Names Alone Are Not Enough

An industrial fastener may be identified using several specification systems.

Examples include:

• 304 stainless steel

• 316 stainless steel

• 316L stainless steel

• A2 stainless steel fastener

• A4 stainless steel fastener

• A2-70

• A4-70

• A4-80

These designations are related, but they do not all describe the same information.

A material designation primarily identifies an alloy specification.

A fastener property designation also establishes mechanical requirements under an applicable standard.

A2 vs A4 Stainless Steel Fasteners

A2 is commonly associated with 304-type austenitic stainless steels.

A4 is commonly associated with molybdenum-bearing 316-type austenitic stainless steels.

However, an A2 or A4 designation should not automatically be treated as an exact chemical composition certificate for one specific alloy.

A2-70 vs A4-70

A2-70 identifies an A2 stainless steel fastener with property class 70.

A4-70 identifies an A4 stainless steel fastener with property class 70.

For applicable fasteners, class 70 corresponds to a specified minimum tensile strength level of 700 MPa.

The two grades may have different corrosion characteristics while sharing the same nominal tensile strength class.

A4-80

A4-80 identifies an A4 stainless steel fastener with property class 80.

It should not be assumed that every 316 stainless steel fastener is A4-80.

The property class must be specified and verified.

Engineering Rule

Material grade, fastener geometry and mechanical property class must be checked independently.

International Standards for Stainless Steel Fastener Selection

The correct standard depends on the component type.

ISO 3506-1:2020

Applies to specified corrosion-resistant stainless steel bolts, screws and studs within its scope.

It defines relevant mechanical and physical properties.

It does not independently establish joint torque/preload behavior, fatigue resistance, shear strength or weldability.

ISO 3506-2

Applies to specified corrosion-resistant stainless steel nuts within its scope.

ISO 3506-3:2025

Applies to specified stainless steel set screws and similar fasteners not under tensile stress.

ISO 3506-4:2025

Applies to specified stainless steel tapping screws.

ISO 3506-6:2020

Provides guidance on the selection of stainless steels and nickel alloys for fasteners.

ISO 3506-7:2024

Applies to specified stainless steel flat washers.

ISO 261 and ISO 965

Relevant to ISO metric thread dimensions and tolerances.

ASME B1.1

Relevant to Unified inch screw threads, including UNC and UNF.

ASTM F593 and ASTM F594

Relevant to specified stainless steel externally threaded fasteners and nuts within their respective scopes.

ASTM A967/A967M

Relevant to chemical passivation treatments for stainless steel parts.

ISO 9227 and ASTM B117

Define salt spray test methods.

Salt spray test results do not directly establish actual outdoor service life.

Standards Selection Principle

An OEM drawing may need separate specifications for:

• Material composition

• Mechanical properties

• Thread system

• Product geometry

• Surface treatment

• Functional testing

• Inspection

Do not apply the standard for one fastener family automatically to another.

Mechanical Strength: Can Stainless Steel Replace High-Strength Carbon Steel Fasteners?

Not automatically.

A stainless steel fastener may provide improved corrosion resistance while having different mechanical properties from a carbon steel or alloy steel fastener.

For example, replacing a class 10.9 alloy steel bolt with an A4-70 stainless steel bolt solely to improve corrosion resistance may reduce the available mechanical capacity.

A material substitution must consider:

• Tensile loading

• Yield-related properties

• Required preload

• Joint stiffness

• Fatigue

• Shear loading

• Thread stripping

• Temperature

• Service environment

OEM Engineering Insight

Corrosion resistance and mechanical strength are separate design requirements.

A suitable solution may involve:

• Selecting an appropriate stainless steel property class

• Retaining a high-strength steel fastener with a qualified protective coating

• Redesigning the joint

• Evaluating another suitable alloy

The final choice must be validated against the actual application.

Corrosion Failure Modes in Stainless Steel Fastening Systems

Pitting Corrosion

Pitting is localized corrosion that can develop when the passive surface film is disrupted.

Chloride-containing environments are a common concern.

Crevice Corrosion

Crevice corrosion can occur where stagnant moisture and aggressive species accumulate.

Potential locations include:

• Under bolt heads

• Under washers

• Between overlapping sheets

• Inside poorly drained joints

Galvanic Corrosion

Galvanic corrosion may occur when dissimilar metals are electrically connected in a conductive environment.

For example, a stainless steel fastener installed into aluminum equipment may create corrosion concerns for the aluminum component.

The severity depends on factors including:

• Material combination

• Electrolyte exposure

• Exposed surface areas

• Coatings

• Joint geometry

Stress Corrosion Cracking

Certain stainless steels can experience stress corrosion cracking under particular combinations of stress, temperature and environmental conditions.

Engineering Information Gain: Why Upgrading Only the Screw May Fail

Consider an outdoor aluminum equipment housing.

The assembly contains:

• Stainless steel screws

• Aluminum panels

• Stainless steel washers

• Moisture-exposed contact surfaces

Changing the screws from 304 to 316 may improve the screws' resistance to some corrosion conditions.

However, it does not automatically protect the aluminum panel from galvanic corrosion.

The correct engineering response may require:

• Material compatibility review

• Isolation measures

• Suitable coatings

• Drainage improvements

• Joint redesign

• Environmental validation

The complete fastening system determines reliability.

Thread Galling in Stainless Steel Fasteners

Thread galling is another important limitation of stainless steel assemblies.

It can occur when contacting metal surfaces experience adhesive damage during sliding.

Potential consequences include:

• Seized threads

• Damaged nuts and bolts

• Installation rejection

• Difficult maintenance

• Production interruptions

Risk factors include:

• Similar mating materials

• High contact pressure

• Surface roughness

• Damaged threads

• Inadequate lubrication

• Uncontrolled tightening

Possible Risk Reduction Measures

• Suitable material pairing

• Thread quality control

• Appropriate lubrication

• Validated tightening procedures

• Suitable surface treatments

• Controlled assembly equipment

Lubrication and coatings may change the relationship between tightening torque and preload.

They must therefore be considered in the complete assembly specification.

Material Selection for Different Stainless Steel Fastener Families

The correct material cannot be chosen independently of the fastener's geometry and manufacturing process.

Stainless Steel Screws and Bolts

Important requirements include:

• Mechanical property class

• Thread specification

• Head geometry

• Corrosion exposure

• Installation torque

• Mating component strength

Stainless Steel Nuts

Important requirements include:

• Internal thread quality

• Mechanical loadability

• Mating bolt compatibility

• Galling

• Locking performance where applicable

Stainless Steel Nylon Insert Lock Nuts

Important requirements include:

• Stainless steel body grade

• Nylon insert suitability

• Operating temperature

• Prevailing torque

• Reuse requirements

• Chemical compatibility

A stainless steel nut body does not eliminate the temperature limitations of its nonmetallic locking insert.

Stainless Steel Blind Rivet Nuts

Important requirements include:

• Body material

• Head and body configuration

• Grip range

• Sheet thickness

• Installation force

• Hole geometry

• Anti-rotation performance

• Pull-out and torque resistance

Stainless Steel Self-Clinching Fasteners

Important requirements include:

• Sheet hardness

• Sheet thickness

• Hole dimensions

• Installation force

• Push-out resistance

• Torque-out resistance

• Material compatibility

Stainless Steel Threaded Inserts

Important requirements include:

• Parent material

• Insert geometry

• Installation method

• Pull-out resistance

• Torque resistance

• Corrosion environment

Custom Stainless Steel Machined Components

Important requirements include:

• Material grade

• Machining characteristics

• Dimensional tolerances

• Surface condition

• Thread quality

• Inspection requirements

Important Manufacturing Principle

A material suitable for a machined threaded component is not automatically suitable for every cold-formed, welded or self-clinching design.

Manufacturing feasibility must be evaluated separately.

Automotive and EV Fastening Solutions

Automotive and EV equipment require controlled fastening performance under mechanical and environmental loading.

Potential Applications

• Electronic module housings

• Auxiliary battery enclosure accessories

• Cable-management brackets

• Interior equipment

• Thermal-management supports

• Noncritical mechanical covers

Engineering Challenges

• Vibration

• Temperature cycling

• Mixed materials

• Corrosion

• Production consistency

Potential Solutions

• A2 or A4 stainless steel threaded components

• Stainless steel nylon insert lock nuts

• Selected stainless steel blind rivet nuts

• Threaded inserts

• Custom fasteners

Material Selection Insight

304 may be suitable for protected interior assemblies.

316 may be evaluated where the environment creates a stronger corrosion requirement.

Safety-critical connections require OEM-specific validation and approval.

AI Data Centers and Server Infrastructure

AI data centers use large numbers of mechanical fastening interfaces in equipment racks, cooling infrastructure and power distribution systems.

Potential Applications

• Server cabinet accessories

• Equipment mounting brackets

• Cable-management hardware

• Fan assembly supports

• Electrical cabinet components

Engineering Challenges

• Assembly efficiency

• Service access

• Vibration

• Electrical bonding

• Mixed materials

• Maintenance

Potential Solutions

• Stainless steel machine screws

• Cage nuts

• Self-clinching nuts

• Self-clinching standoffs

• Selected threaded inserts

Material Selection Insight

For many controlled indoor installations, 304 may be sufficient if stainless steel is required.

316 should be justified by actual corrosion exposure rather than selected automatically.

Liquid Cooling and Thermal Management

Liquid cooling systems may expose fastening components to condensation, coolant leakage or aggressive service environments.

Potential Applications

• Pump mounting brackets

• Heat exchanger accessories

• Cooling equipment covers

• Mechanical supports

• Auxiliary equipment housings

Engineering Challenges

• Condensation

• Temperature cycling

• Galvanic corrosion

• Vibration

• Serviceability

Potential Solutions

• 304 stainless steel fasteners for suitable environments

• 316 stainless steel fasteners where justified

• Stainless steel blind rivet nuts

• Custom threaded components

Engineering Limitation

A corrosion-resistant fastener does not establish pressure containment or leak-tightness.

Industrial Electrical Equipment and Power Distribution

Industrial electrical equipment frequently uses sheet-metal enclosures and modular assemblies.

Potential Applications

• Electrical cabinets

• Power distribution enclosures

• Equipment covers

• Mounting brackets

• Auxiliary hardware

Engineering Challenges

• Thin sheet-metal construction

• Thread engagement

• Electrical bonding

• Corrosion

• Assembly efficiency

Potential Solutions

• Stainless steel machine screws

• Self-clinching nuts

• Blind rivet nuts

• Cage nuts

• Welded threaded components

Selection Insight

The fastening architecture may be more important than simply changing material.

Electrical grounding and bonding requirements must be evaluated independently.

Semiconductor and Precision Equipment

Semiconductor and precision equipment may require strict control of materials, geometry and surface condition.

Potential Applications

• Instrument housings

• Sensor brackets

• Mechanical fixtures

• Equipment covers

• Precision spacers

Engineering Challenges

• Dimensional accuracy

• Surface cleanliness

• Particle generation

• Corrosion

• Repeatability

Potential Solutions

• Stainless steel precision screws

• Stainless steel standoffs

• CNC machined threaded components

• Selected threaded inserts

Cleanroom compatibility must be established for the actual process environment.

HVAC and Ventilation Equipment

HVAC equipment may experience condensation, vibration and outdoor exposure.

Potential Applications

• Fan brackets

• Ventilation equipment

• Outdoor units

• Equipment panels

• Auxiliary mounting hardware

Engineering Challenges

• Moisture

• Corrosion

• Vibration

• Sheet-metal assembly

• Maintenance

Potential Solutions

• 304 stainless steel screws

• 316 stainless steel components for suitable coastal applications

• Stainless steel rivet nuts

• Locking nuts

• Clip-on nuts

Solar and Outdoor Energy Equipment

Solar and outdoor energy equipment may experience long-term atmospheric exposure.

Potential Applications

• Auxiliary mounting hardware

• Electrical enclosures

• Cable-management components

• Serviceable equipment brackets

Engineering Challenges

• Atmospheric corrosion

• Temperature cycling

• Mixed materials

• Maintenance access

Potential Solutions

304 or 316 stainless steel components may be considered depending on site exposure and engineering requirements.

Primary structural mounting systems require project-specific design and approval.

Food-Processing Machinery

Food-processing equipment may require corrosion-resistant fastening components.

Potential Applications

• Packaging machinery

• External machine frames

• Equipment covers

• Mechanical accessories

Engineering Challenges

• Cleaning chemicals

• Washdown

• Surface contamination

• Crevice corrosion

• Maintenance

Potential Solutions

• 304 stainless steel components

• 316 stainless steel components where justified

• Passivated components

• Custom threaded parts

Material selection alone does not establish food-contact compliance.

Medical and Laboratory Equipment

Medical and laboratory equipment may require precise, corrosion-resistant components.

Potential Applications

• Laboratory instrument frames

• Equipment housings

• Noncritical mechanical accessories

• Precision fixtures

Engineering Challenges

• Cleaning

• Corrosion

• Surface condition

• Dimensional consistency

• Traceability

Potential Solutions

• Stainless steel machine screws

• Precision threaded components

• Custom machined spacers

• Selected passivated components

Specific medical-device regulatory requirements must be addressed separately.

Marine and Coastal Equipment

Marine-related equipment may experience airborne salt, condensation, splash exposure and trapped moisture.

Potential Applications

• Coastal electrical enclosures

• Instrument brackets

• Auxiliary marine equipment

• Service panels

Engineering Challenges

• Chloride pitting

• Crevice corrosion

• Galvanic corrosion

• Difficult maintenance

Potential Solutions

316 stainless steel is often a stronger candidate than 304 for evaluation in chloride-containing environments.

However, severe marine exposure may require alternative alloys or redesigned connections.

Important Limitation

316 stainless steel is not universally suitable for continuous seawater immersion.

Industrial Machinery and Automation

Industrial machinery requires reliable mechanical fastening and efficient assembly.

Potential Applications

• Equipment housings

• Sensor mounts

• Mechanical brackets

• Automation fixtures

• Service panels

Engineering Challenges

• Cyclic loading

• Vibration

• Maintenance

• Production efficiency

• Thread wear

Potential Solutions

• Stainless steel screws

• Locking nuts

• Threaded inserts

• CNC machined components

High-load connections require verification of the actual mechanical property class.

Industry Material Selection Matrix

Surface Treatments and Corrosion Protection

Stainless steel often relies on its passive surface condition for corrosion resistance.

Additional surface treatments may be specified for particular requirements.

Passivation

Passivation can help remove certain surface contaminants and support corrosion resistance.

The process should follow an appropriate specification when required.

PTFE-Containing Coatings

Selected coatings may reduce friction or modify assembly behavior.

However, no coating should be assumed to completely prevent galling.

Black Surface Finishes

Black finishes may be selected for appearance or reduced reflection.

Corrosion resistance and coating durability require verification.

Salt Spray Testing

ISO 9227 and ASTM B117 provide laboratory salt spray test methods.

Test duration should not be presented as a direct prediction of field service life.

Manufacturing Engineering: Selecting Material for Reliable Production

For manufacturing engineers and production managers, material selection affects production performance as well as service life.

Cold Forming

Material condition and geometry affect forming feasibility.

Machining

Different stainless steel grades may exhibit different machining behavior.

Thread Rolling

Material condition, thread geometry and tooling affect process capability.

Welding

Weldability and corrosion behavior must be evaluated for the specified component.

Assembly

Galling, friction and thread quality may influence installation consistency.

Inspection

Material identity, dimensional requirements and mechanical performance must be controlled.

Production Insight

A material change from 304 to 316 may affect manufacturing cost, tooling, production efficiency and procurement lead time.

It should be evaluated before mass-production approval.

Common Failure Modes and Corrective Actions

OEM Procurement: How to Qualify a Stainless Steel Fastener Supplier

Purchasing and supplier development teams should evaluate more than quoted unit price.

Material Verification

Confirm the exact specified grade.

Mechanical Requirements

Confirm the applicable fastener property class.

Drawing Conformity

Review:

• Dimensions

• Thread specifications

• Tolerances

• Geometry

• Surface condition

Manufacturing Feasibility

Confirm that the supplier can manufacture the required component using a suitable process.

Quality Documentation

Depending on the project, request:

• Material certificates

• Inspection reports

• Mechanical test reports

• Surface treatment records

• Lot traceability

Supply Chain Considerations

Evaluate:

• MOQ

• Prototype requirements

• Production quantities

• Lead time

• Packaging

• Delivery requirements

• Change control

• Long-term supply continuity

Supplier Qualification Insight

A supplier listing 316 stainless steel does not automatically establish conformity with an A4-70 drawing or a specific OEM material requirement.

The actual component must be qualified.

Material Substitution and Second-Source Approval

OEM manufacturers may seek alternative suppliers or material substitutions to reduce cost and supply risk.

However, substitutions should follow a controlled process.

Review the Original Drawing

Identify all material, dimensional and mechanical requirements.

Compare Candidate Materials

Review corrosion behavior, strength, manufacturing compatibility and cost.

Review the Complete Joint

Consider mating components, washers, coatings and installation procedures.

Perform Required Validation

The OEM may require corrosion testing, mechanical testing or assembly trials.

Approve Changes Before Production

Material or supplier substitutions should not be implemented without the required customer authorization.

Commercial Insight

A lower quoted unit price does not necessarily represent a lower total cost if the substitution increases inspection, maintenance, assembly or failure costs.

304 vs 316 Stainless Steel Fasteners: Total Cost of Ownership

Material cost is only one component of procurement cost.

A practical evaluation may include:

• Fastener unit price

• Manufacturing cost

• Surface treatment cost

• Installation cost

• Inspection cost

• Maintenance cost

• Replacement cost

• Failure risk

• Supplier reliability

Scenario: Indoor Industrial Cabinet

If 304 meets all requirements, selecting 316 may create unnecessary material cost.

Scenario: Coastal Equipment

If 304 presents unacceptable corrosion risk, 316 may provide lifecycle value.

Scenario: Stainless Steel Assembly with Galling

Changing material grade alone may not solve the problem.

Assembly design and friction control may be more important.

Scenario: Thin Sheet-Metal Connection

A stainless steel blind rivet nut or self-clinching component may provide a more effective solution than changing the screw material.

Juxin Fasteners: Stainless Steel Fastening Solutions for OEM Manufacturers

Juxin Fasteners supports industrial customers requiring corrosion-resistant fastening components and drawing-based engineering review.

Relevant product families include:

Stainless Steel Screws and Threaded Components

• Machine screws

• Selected hex head screws

• Socket screws

• Custom threaded parts

Stainless Steel Nuts

• Nylon insert lock nuts

• Selected all-metal locking nuts

• Flange locking nuts

• Custom nuts

Stainless Steel Blind Rivet Nuts

• Round body

• Knurled body

• Half-hexagonal body

• Full-hexagonal body

• Open-end designs

• Closed-end designs

Sheet-Metal Fasteners

• Selected self-clinching components

• Cage nuts

• Clip-on nuts

• Related threaded fastening hardware

Threaded Inserts

• Stainless steel threaded inserts

• Brass threaded inserts

• Thread repair inserts

• Inserts for plastic components

Custom Machined Components

• Spacers

• Standoffs

• Threaded components

• Drawing-based CNC machined parts

Specific grades, dimensions, coatings, production methods, inspection requirements and availability must be confirmed for each project.

Frequently Asked Questions

What is the main difference between 304 and 316 stainless steel fasteners?

316 contains molybdenum and generally provides improved resistance to certain chloride-related localized corrosion conditions compared with 304.

Is 316 always better than 304?

No. 304 may be the more economical and technically sufficient choice for many industrial applications.

Is A2 the same as 304?

A2 is commonly associated with 304-type stainless steels, but it is a fastener grade designation rather than one exact material identity.

Is A4 the same as 316?

A4 is commonly associated with molybdenum-bearing 316-type stainless steels. The exact material and fastener requirements should be verified.

Is 316L better than 316?

316L has a lower carbon content and may be preferred for certain manufacturing or corrosion considerations. It is not universally superior for every application.

Is A4-70 stronger than A2-70?

Not solely because it is A4. Both are property class 70 fasteners within the applicable standard.

Can 316 stainless steel fasteners rust?

Yes. They can experience localized or other forms of corrosion under unfavorable conditions.

Can 316 stainless steel be used in seawater?

Suitability depends on the exact environment and joint design. Continuous seawater exposure requires careful engineering evaluation.

Can stainless steel fasteners be used with aluminum?

Yes, in suitable designs, but galvanic corrosion and mechanical compatibility must be considered.

Why do stainless steel nuts and bolts seize?

Thread galling, damaged threads, friction and unsuitable tightening conditions can contribute to seizure.

Do stainless steel fasteners need passivation?

Not every component requires an additional passivation treatment. The need depends on the manufacturing condition and application specification.

Can A4-70 replace class 10.9 steel fasteners?

Not automatically. The mechanical requirements and complete joint design must be reviewed.

Which material is suitable for stainless steel blind rivet nuts?

304 or 316 may be considered depending on the environment, installation requirements and product design.

Is 316 required for solar equipment?

Not universally. Material selection depends on exposure, structural requirements and project specifications.

Can Juxin Fasteners support custom stainless steel components?

Juxin Fasteners accepts OEM drawing-based inquiries for technical and manufacturing feasibility review.

OEM Stainless Steel Fastener RFQ Checklist

For accurate technical review and quotation, please provide:

Product Information

• Product type

• Applicable standard

• 2D drawing

• 3D model if available

• Dimensions

• Tolerances

• Thread specification

Material Information

• 304, 316, 316L or another specified material

• A2/A4 grade where applicable

• Mechanical property class

• Material certificate requirements

Application Information

• Industry

• Operating environment

• Temperature

• Chemical exposure

• Chloride exposure

• Mechanical loading

• Vibration

• Mating materials

• Assembly process

Surface Requirements

• Passivation

• Coating

• Appearance

• Corrosion acceptance criteria

Quality Requirements

• Dimensional inspection

• Thread inspection

• Material verification

• Mechanical testing

• Functional testing

• Traceability

Commercial Requirements

• Sample quantity

• Initial order quantity

• Annual forecast

• MOQ expectations

• Target lead time

• Packaging

• Delivery destination

Request an OEM Stainless Steel Fastener Quotation

Juxin Fasteners supports international OEM manufacturers, design engineers, mechanical engineers, structural engineers, 

manufacturing engineers, production managers, purchasing specialists, procurement managers and supplier development teams.

Whether your project requires 304 stainless steel fasteners, 316 corrosion-resistant components, stainless steel blind rivet nuts, locking nuts, threaded inserts or customized fastening parts, material selection should begin with the complete application requirements.

Send your drawings, material specifications, operating conditions and purchasing quantities for technical review and quotation.

Company: Juxin Fasteners

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

Email: info@juxinfasteners.com

The right stainless steel fastener material is the one that meets the joint's corrosion, mechanical, 

manufacturing and lifecycle requirements—not simply the one with the higher alloy content.