Locking Pins: Load Capacity 10-500 kN, Diameter 20-100 mm

Component Specifications

Definition

Locking pins are cylindrical or tapered mechanical fasteners designed to engage with corresponding receptacles in quick attach couplers, providing positive locking through shear force, spring mechanisms, or hydraulic pressure to prevent accidental detachment during operation. They ensure precise alignment and load transfer between the machine and attachment.

Working Principle

Locking pins operate by inserting into aligned holes in the coupler and attachment, then engaging a locking mechanism (such as a spring-loaded ball, hydraulic cylinder, or manual lever) that prevents axial movement. This creates a rigid connection that transfers operational forces while allowing quick release when disengagement is required.

Materials

Typically made from alloy steel (e.g., AISI 4140, 4340) or stainless steel (e.g., 304, 316) with hardness of 28-32 HRC for standard applications, or 40-45 HRC for high-wear applications. May include surface treatments like zinc plating, black oxide, or hard chrome coating.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	50-300 mm
Diameter	20-100 mm
Load Capacity	10-500 kN
Surface Finish	Ra 1.6-3.2 μm
Operating Temperature	-40°C to 120°C

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 11901, DIN 1481, SAE J429

Parent Products

This component is used in the following industrial products

Quick Attach Coupler

A tool-free mechanical interface for rapid attachment and detachment of implements on skid steer loaders.

View Product Details

Engineering Analysis

Risks & Mitigation

Shear failure under overload
Corrosion in harsh environments
Wear leading to reduced locking force
Improper installation causing detachment

FMEA Triads

Trigger: Material fatigue from cyclic loading
Failure: Pin fracture during operation
Mitigation: Use higher grade materials, implement regular inspection schedules, design with safety factors

Trigger: Contamination in locking mechanism
Failure: Failure to engage or disengage properly
Mitigation: Install protective covers, implement regular cleaning protocols, use sealed designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm for diameter, ±0.1 mm for length

Test Method

Load testing per ISO 11901, hardness testing per ASTM E18, dimensional verification with CMM

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.

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Manufacturers of Locking Pins

Manufacturer profiles associated with Locking 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 are the main types of locking pins for quick attach couplers?

The main types include spring-loaded ball lock pins, hydraulic locking pins, manual lever pins, and tapered locking pins, each suitable for different load requirements and operational environments.

How do I maintain locking pins for optimal performance?

Regular inspection for wear, cleaning of debris, lubrication of moving parts, and checking locking mechanism engagement. Replace pins showing significant wear or 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.

Locking Pins