INDUSTRY COMPONENT

Pins and Locks

Telescopic boom pins and locks are mechanical fastening components that secure boom sections in extended positions for load stability.

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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 During retraction, the locking mechanism is disengaged, pins are withdrawn, and boom sections slide freely.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
  • 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
Standards
ISO 286-2, DIN 6325, ISO 898-1, DIN 471

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pins and Locks.

telescopic boom pins boom locking mechanism construction equipment components hydraulic pins boom safety locks crane boom components heavy machinery parts Pins and Locks Pins and Locks in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (10 reviews)

"Testing the Pins and Locks now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Pins and Locks meets all ISO standards."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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