INDUSTRY COMPONENT

Locking Pin

A precision-engineered locking pin used in brake and locking mechanisms to secure moving parts in position.

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Component Specifications

Definition
A locking pin is a cylindrical mechanical component designed to engage with mating holes or slots in machine parts to prevent relative movement. In brake and locking mechanisms, it serves as a positive locking device that maintains components in a fixed position during operation, ensuring safety and operational reliability. These pins typically feature chamfered ends for easy insertion and may include retention features like grooves for circlips or spring-loaded detents.
Working Principle
The locking pin operates on the principle of positive mechanical interference. When inserted into aligned holes in two or more components, it physically blocks relative motion by filling the clearance space. In brake mechanisms, it often engages with a rotor or lever to lock the system in a disengaged or engaged position. Some designs incorporate spring-loaded balls or detents that snap into place, providing tactile feedback and preventing accidental dislodgement.
Materials
Typically made from alloy steels (e.g., AISI 4140, 4340) for strength and wear resistance, often heat-treated to HRC 28-35. Corrosion-resistant versions use stainless steels (e.g., 304, 316) or coatings like zinc plating, black oxide, or phosphate. High-performance applications may use titanium alloys or case-hardened steels.
Technical Parameters
  • Length 10mm to 150mm
  • Diameter 3mm to 25mm (common range)
  • Hardness 28-35 HRC (core), 45-50 HRC (case for hardened versions)
  • Tolerance h6 or h7
  • Load Capacity Shear strength 400-800 MPa depending on material
  • Surface Finish Ra 1.6μm or better
Standards
ISO 8734, DIN 6325, ISO 13337, ANSI B18.8.2

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Locking Pin.

locking pin brake mechanism pin industrial locking component mechanical locking device safety pin DIN 6325 ISO 8734 shear pin retention pin Locking Pin in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Brake/Locking Mechanism

A mechanical or electromechanical device that stops or holds an indexing mechanism in a fixed position.

View Product Details

Twist Lock Mechanism

A mechanical locking device used to securely fasten shipping containers to lifting equipment or transport vehicles.

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Towing Hitch

A mechanical coupling device used to connect an asphalt distributor to a towing vehicle for transportation.

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Engineering Analysis

Risks & Mitigation
  • Shear failure under overload
  • Corrosion leading to seizure
  • Wear causing loosening
  • Improper installation
  • Fatigue failure from cyclic loading
FMEA Triads
Trigger: Excessive shear load beyond design limits
Failure: Pin shears, causing mechanism unlock
Mitigation: Implement load monitoring, use higher grade materials, regular inspection
Trigger: Corrosion in humid environments
Failure: Pin seizes in bore, preventing operation
Mitigation: Use corrosion-resistant materials/coatings, regular maintenance, environmental controls
Trigger: Wear from frequent engagement/disengagement
Failure: Increased clearance causes unreliable locking
Mitigation: Use hardened materials, implement wear indicators, establish replacement schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance typically h6 (ISO 286), length tolerance ±0.5mm
Test Method
Shear testing per ASTM F606, hardness testing per ASTM E18, dimensional inspection per ISO 2768

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a locking pin and a cotter pin?

Locking pins provide positive locking through precise dimensional fit and often include retention features, while cotter pins are flexible fasteners that secure by deformation. Locking pins offer higher precision and reliability in critical applications.

How do I select the right locking pin material?

Consider load requirements (shear strength), environmental conditions (corrosion resistance), wear characteristics, and compatibility with mating parts. Alloy steels are common for general use, stainless for corrosive environments, and hardened steels for high-wear applications.

What maintenance do locking pins require?

Regular inspection for wear, corrosion, and deformation. Lubrication may be needed depending on application. Replace pins showing significant wear or damage to maintain safety margins.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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