INDUSTRY COMPONENT

Crosshead pin (wrist pin)

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

View Specifications

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.

View Product Details

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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (34 reviews)

"The technical documentation for this Crosshead pin (wrist pin) is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Crosshead pin (wrist pin) so far."

"Testing the Crosshead pin (wrist pin) now; the technical reliability results are within 1% of the laboratory datasheet."

Related Components

Machine Frame
The rigid structural foundation of a CNC wood router that provides stability, vibration damping, and precision alignment for cutting operations.
pH Sensor Assembly
Precision pH sensor assembly for automated monitoring and dosing systems in industrial applications
Load Cell Assembly
Precision load cell assembly for automated powder dispensing systems
Dust Collection Port
A dust collection port is a critical component in automated powder dispensing systems that captures airborne particulates at the source to maintain clean air quality and prevent cross-contamination.

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.

Get Quote for Crosshead pin (wrist pin)

Crossbeam Crosshead Shoe / Slipper