Industrial fasteners
Define the joint before choosing the fastener.
A fastener is part of a load path. Selection begins with what the joint must clamp, locate, retain, pivot or anchor—then continues through loading, environment, thread, assembly and manufacturing requirements.
Selection funnel
Four decisions narrow the manufacturing route
Type, material and finish should not be selected independently. Each decision changes the next: loading affects material and grade; environment affects material and coating; thread and assembly affect tolerances, finish allowance and inspection.
Joint role
Clamp, locate, retain, pivot, anchor or provide controlled movement.
Service demand
Tension, shear, fatigue, impact, vibration and preload behavior.
Exposure
Temperature, moisture, chemicals, corrosion and mating materials.
Production route
Stock matching, cold forming, forging, machining, threading and finishing.
Fastener roles
Choose the family by function
A familiar shape can hide important differences in load transfer, assembly access, removal, alignment and locking. Start with the job, then confirm geometry and standard.
Manufacturing route
Geometry, quantity and material condition shape the process
Cold forming can support efficient repeat production for suitable shapes and quantities. Machining can address controlled features, lower volumes or geometries not suited to forming. Forging and secondary operations may be combined where section, strength flow or complex features require them.
The correct route is confirmed from the drawing, sample, material, tolerances, finish, inspection scope and order quantity—not from the product name alone.
RFQ completeness
Record what is confirmed and what remains open
Joint role, mating parts, installation access, tightening or locking method and reuse expectations.
PROJECT INPUTHead, shank, length, diameter, thread system, pitch, class/tolerance, direction and special features.
DRAWING OR SAMPLEMaterial family, strength or property class, heat treatment, hardness range where specified, and critical load mode.
TO BE CONFIRMEDCoating/finish, corrosion exposure, thread allowance, appearance, tests, certificates, packing and traceability.
ORDER REQUIREMENTStock matching
Suitable when a recognized standard or existing RELIA item matches the function, dimensions, thread, material/grade, finish and quantity.
- Provide full designation where known
- Confirm deviations are not hidden by a similar description
- State any required documentation
Custom manufacture
Suitable when geometry, material, tolerances, performance, branding, packing or order program requires a controlled project specification.
- Use drawing, sample or controlled requirement list
- Separate critical features from reference information
- Agree sample and inspection scope before repeat production
Buyer questions
Questions to resolve before quotation
Is material name enough to define fastener strength?
No. Material, property or strength grade, heat treatment, hardness, manufacturing route and applicable standard work together. State the required designation or performance basis when known.
Can coating thickness affect thread fit?
Yes. A finish adds material to thread surfaces and may change fit, gauge results and assembly behavior. The required finished condition and inspection method should be defined.
Can RELIA quote from a sample without a drawing?
A sample can start identification or custom review. Critical dimensions, original versus worn geometry, material, performance, finish and acceptance requirements still need to be recorded before production release.
When should a custom fastener be considered?
Consider custom manufacture when a standard item does not meet geometry, material, tolerance, surface, performance, identification, packing or order-program requirements.
Factory review
Have a drawing, sample or fastener requirement list?
Send the joint function, dimensions, thread, material or grade, finish, quantity and available reference files. RELIA can compare stock matching with custom production and identify the remaining confirmation points.
