Pins and Locks: Pin Diameter 25-100 mm, Locking Force 5-50 kN

Component Specifications

Definition

Telescopic boom pins and locks are precision-engineered mechanical fastening systems used in construction and material handling equipment to securely lock individual boom sections in extended positions. These components consist of hardened steel pins that engage with precisely machined holes or slots in adjacent boom sections, along with locking mechanisms (manual, hydraulic, or pneumatic) that prevent accidental disengagement during operation. They are critical for maintaining structural integrity, load capacity, and operational safety by preventing boom collapse or unintended retraction under load.

Working Principle

The working principle involves aligning boom sections to precise positions where pin holes match, then inserting locking pins through aligned holes using mechanical, hydraulic, or pneumatic actuators. Once engaged, secondary locking mechanisms (such as spring-loaded detents, hydraulic pressure locks, or mechanical latches) secure the pins in place to prevent vibration-induced dislodgement. During retraction, the locking mechanism is disengaged, pins are withdrawn, and boom sections slide freely.

Materials

High-strength alloy steel (AISI 4140, 4340), case-hardened to 45-55 HRC; corrosion-resistant coatings (zinc plating, powder coating, or thermal spray); bronze or polymer bushings for wear reduction; stainless steel for marine environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cycle Life	≥ 100,000 cycles
Pin Diameter	25-100 mm
Locking Force	5-50 kN
Shear Strength	≥ 500 MPa
Tensile Strength	≥ 800 MPa
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 286-2, DIN 6325, ISO 898-1, DIN 471

Parent Products

This component is used in the following industrial products

Telescopic Boom

A multi-section hydraulic boom that extends and retracts to adjust the crane's reach and lifting height.

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Engineering Analysis

Risks & Mitigation

Pin shear failure under overload
Lock disengagement due to vibration
Corrosion-induced seizure
Misalignment causing binding
Hydraulic/pneumatic system failure

FMEA Triads

Trigger: Insufficient lubrication
Failure: Increased friction and wear, leading to pin binding or seizure
Mitigation: Implement automated lubrication systems, use high-temperature grease, and follow scheduled maintenance intervals

Trigger: Contamination in hydraulic/pneumatic systems
Failure: Lock actuator malfunction, causing incomplete engagement or disengagement
Mitigation: Install filtration systems, use sealed actuators, and conduct regular fluid analysis

Trigger: Fatigue from cyclic loading
Failure: Crack propagation in pin or locking mechanism, leading to catastrophic failure
Mitigation: Implement non-destructive testing (ultrasonic, magnetic particle), use fatigue-resistant materials, and enforce load limit controls

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

H7/g6 fit for pin/bore interface, ±0.05 mm positional accuracy for pin holes, surface finish Ra ≤ 1.6 μm

Test Method

Load testing per ISO 4309, non-destructive testing (ultrasonic, dye penetrant), functional cycle testing, corrosion resistance testing per ASTM B117

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 Pins and Locks

Manufacturer profiles associated with Pins and Locks.

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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

How often should telescopic boom pins and locks be inspected?

Visual inspection before each use, detailed inspection every 250 operating hours, and comprehensive testing every 1,000 hours or annually, following manufacturer guidelines and ISO 4309 standards.

What are common failure modes of boom pins and locks?

Common failures include wear deformation, corrosion pitting, fatigue cracking, hydraulic seal leakage in actuated systems, and spring failure in mechanical locks, often caused by overload, contamination, or inadequate maintenance.

Can pins and locks be replaced individually or as a set?

Replacement depends on wear patterns; typically replaced as matched sets to ensure uniform load distribution, though individual replacement is possible if components meet original specifications and tolerance requirements.

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 and Locks