Pins: Diameter Tolerance h6/h7 (ISO), Chamfer 0.3-0.5 mm × 45°

Component Specifications

Definition

Chain drive pins are precision-engineered cylindrical components that serve as the primary connecting elements between adjacent chain links in roller chains. They are inserted through bushings and secured with retaining clips or press fits, forming the articulated joints that allow the chain to flex while maintaining structural integrity under tensile loads. These pins must withstand shear forces, wear from articulation, and exposure to contaminants while maintaining precise dimensional tolerances for smooth engagement with sprocket teeth.

Working Principle

Chain pins function as rotating or fixed pivots that connect chain plates, allowing articulation between links while transmitting tensile forces along the chain's longitudinal axis. During operation, pins rotate within bushings (in roller chains) or directly contact adjacent links (in silent chains), creating low-friction joints that enable the chain to wrap around sprockets while maintaining constant pitch. The pin's cylindrical geometry distributes shear stresses evenly across its cross-section, while surface hardening prevents wear from repeated articulation.

Materials

Typically manufactured from case-hardened alloy steels (e.g., AISI 8620, 15B35) or stainless steels (e.g., 304, 316) for corrosion resistance. Surface treatments include carburizing (0.5-1.0mm case depth), nitriding, or chrome plating to achieve 50-60 HRC surface hardness with tough cores (25-35 HRC). High-performance applications may use tool steels or precipitation-hardening grades.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Chamfer	0.3-0.5 mm × 45°
Straightness	0.01 mm per 25 mm
Hardness Core	25-35 HRC
Surface Finish	Ra 0.4-0.8 μm
Hardness Surface	50-60 HRC
Diameter Tolerance	h6/h7 (ISO)

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 606, DIN 8187, ANSI B29.1

Parent Products

This component is used in the following industrial products

Chain Drive

A mechanical power transmission system that uses a chain and sprockets to transfer torque from the input shaft to the output shaft within a transfer case.

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Engineering Analysis

Risks & Mitigation

Shear failure under overload
Wear-induced elongation changing chain pitch
Corrosion in wet environments
Fatigue cracking from cyclic loads

FMEA Triads

Trigger: Inadequate lubrication
Failure: Accelerated wear and seizure
Mitigation: Implement automated lubrication systems and use chain-compatible greases

Trigger: Misalignment between sprockets
Failure: Uneven loading and premature fatigue
Mitigation: Laser-align sprockets during installation and monitor alignment quarterly

Trigger: Contaminant ingestion
Failure: Abrasive wear and corrosion
Mitigation: Install protective covers and use sealed chain designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter: ±0.025 mm, Length: ±0.1 mm, Hardness: ±2 HRC

Test Method

Dimensional verification with micrometers, hardness testing per ISO 6508, fatigue testing per ISO 1352

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

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Manufacturers of Pins

Manufacturer profiles associated with Pins.

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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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Frequently Asked Questions

What causes chain pin failure?

Primary failure modes include shear fracture from overload, wear from inadequate lubrication, corrosion in harsh environments, and fatigue from cyclic loading. Proper material selection and maintenance prevent these issues.

Are chain pins interchangeable between brands?

Pins are generally NOT interchangeable between different chain manufacturers due to precise diameter, length, and hardness specifications. Always use OEM-specified pins for safety and warranty compliance.

How do I identify a worn chain pin?

Measure pin diameter at multiple points—wear exceeding 1% of original diameter indicates replacement need. Visual signs include scoring, pitting, or visible deformation.

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.

Pins