INDUSTRY COMPONENT

Crosshead pin (wrist pin)

A precision cylindrical pin connecting the piston to the connecting rod in reciprocating engines and compressors.

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Component Specifications

Definition
The crosshead pin, also known as a wrist pin or piston pin, is a hardened cylindrical component that serves as the pivotal connection between the piston and the connecting rod in reciprocating machinery. It transfers combustion forces from the piston to the connecting rod while allowing oscillating motion, and is typically press-fitted or secured with retaining rings in the piston bosses.
Working Principle
The crosshead pin operates as a bearing surface that allows the connecting rod small end to pivot relative to the piston during the reciprocating cycle. It converts linear piston motion into rotational crankshaft motion while withstanding high cyclic loads, shear stresses, and thermal expansion differentials.
Materials
Case-hardened alloy steel (e.g., SAE 8620, 4140), carburized or nitrided for surface hardness (58-62 HRC) with tough core; sometimes chrome-plated for wear resistance.
Technical Parameters
  • Length 50-200 mm
  • Diameter 20-100 mm
  • Hardness 58-62 HRC surface, 30-40 HRC core
  • Concentricity 0.005 mm
  • Surface Finish Ra 0.2-0.4 μm
  • Straightness Tolerance 0.01 mm per 100 mm
Standards
ISO 286-2, DIN 71902, SAE J144

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crosshead pin (wrist pin).

crosshead pin wrist pin piston pin connecting rod pin engine piston component compressor linkage reciprocating machinery parts Crosshead pin (wrist pin) Crosshead pin (wrist pin) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Crossheads

A reciprocating component in the power end of machinery that converts linear motion to rotational motion or vice versa.

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Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Wear and ovalization
  • Seizure due to inadequate lubrication
  • Retaining ring failure causing catastrophic damage
FMEA Triads
Trigger: Insufficient lubrication
Failure: Scoring, seizure, and accelerated wear
Mitigation: Implement oil pressure monitoring, use forced lubrication systems, specify proper oil viscosity
Trigger: Material fatigue from cyclic loading
Failure: Crack propagation and fracture
Mitigation: Use shot peening for compressive stress, implement regular ultrasonic inspection, maintain proper hardness gradient

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO IT6-IT7 for diameter, geometric tolerances per ISO 1101
Test Method
Ultrasonic testing for internal defects, magnetic particle inspection for surface cracks, dimensional verification with CMM

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 crosshead pin and a wrist pin?

In industrial terminology, 'crosshead pin' typically refers to larger machinery like compressors and diesel engines with separate crossheads, while 'wrist pin' is more common in automotive engines where the pin connects directly to the piston. Functionally they are similar.

How are crosshead pins lubricated?

They are lubricated through oil passages in the connecting rod (pressure lubrication) or via splash lubrication. Some designs include oil holes in the pin itself for distribution.

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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Crossbeam Crosshead Shoe / Slipper