Fastener Body/Bolt: Length Range 5mm to 500mm

Component Specifications

Definition

A fastener body or bolt is a cylindrical mechanical component with external threading, typically featuring a head at one end for torque application. It functions by creating clamping force through tension when tightened with a nut or into a tapped hole, providing secure joint connections in machinery assemblies. Bolts are engineered to withstand axial loads, shear forces, and vibration while maintaining structural integrity.

Working Principle

Works on the principle of creating tensile preload through thread engagement. When tightened, the bolt stretches elastically, generating clamping force that holds components together. The friction between threads and bearing surfaces resists loosening, while the bolt's shank transfers shear loads across the joint interface.

Materials

Commonly manufactured from carbon steel (Grade 2, 5, 8), alloy steel (4140, 4340), stainless steel (304, 316), or titanium alloys. Surface treatments include zinc plating, hot-dip galvanizing, phosphate coating, or Dacromet for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Drive Type	Hex, Torx, Phillips, Slotted
Head Style	Hex, Socket, Button, Flange
Thread Type	Metric (M), UNC, UNF
Length Range	5mm to 500mm
Diameter Range	M3 to M64
Strength Grade	4.6, 8.8, 10.9, 12.9

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 898-1, ISO 4014, ISO 4017, DIN 931, DIN 933, ASME B18.2.1

Parent Products

This component is used in the following industrial products

Fastener System

A mechanical assembly designed to securely join and fasten panels together within a larger panel joint system.

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Engineering Analysis

Risks & Mitigation

Thread stripping
Over-torquing damage
Corrosion failure
Fatigue cracking
Vibration loosening
Galvanic corrosion

FMEA Triads

Trigger: Insufficient torque during installation
Failure: Joint separation under load
Mitigation: Implement calibrated torque tools and torque verification procedures

Trigger: Corrosive environment exposure
Failure: Reduced cross-section and tensile failure
Mitigation: Specify corrosion-resistant materials and protective coatings

Trigger: Cyclic loading beyond fatigue limit
Failure: Crack initiation and propagation
Mitigation: Design for proper preload and use bolts with higher fatigue strength

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance 6g for external threads per ISO 965-1, length tolerance ±0.5mm for standard bolts

Test Method

Tensile testing per ISO 898-1, hardness testing, salt spray testing per ASTM B117, torque-tension testing

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Fastener Body/Bolt

Manufacturer profiles associated with Fastener Body/Bolt.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between a bolt and a screw?

Bolts typically require nuts for assembly and are designed for through-holes, while screws engage directly with tapped holes. Bolts generally have unthreaded shank sections for shear resistance.

How do I select the correct bolt grade?

Select based on required tensile strength, shear capacity, and environmental conditions. Grade 8.8 is common for general machinery, while 10.9/12.9 grades are for high-stress applications. Consider corrosion requirements for material selection.

What causes bolt loosening in machinery?

Vibration, thermal cycling, insufficient preload, improper torque application, or joint relaxation. Use locking mechanisms like nylon inserts, thread lockers, or prevailing torque nuts for critical applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Fastener Body/Bolt