Crosshead for Reciprocating Pumps - Component Specifications

Product Specifications

Technical details and manufacturing context for Crosshead

Definition

The crosshead is a critical component within the power end of reciprocating pumps. It serves as the mechanical interface between the rotating crankshaft (via the connecting rod) and the linearly reciprocating plunger rod or piston rod. Its primary function is to absorb the side thrust forces generated by the angular motion of the connecting rod, ensuring the plunger/piston moves in a true linear path within the fluid cylinder, thereby preventing wear and misalignment. The crosshead is typically guided by crosshead guides or distance pieces, which constrain its motion to a straight line. It is connected to the connecting rod via a wrist pin (crosshead pin) and to the plunger rod at the opposite end. Materials commonly used include forged steel, ductile iron, and alloy steel. Key parameters include stroke length (50–300 mm), plunger diameter (20–150 mm), maximum operating pressure (10–35 MPa), operating temperature range (-20 to 120 °C), surface roughness (Ra 0.2–0.8 µm, ISO 4287), hardness (50–60 HRC, ISO 6508), material grade (42CrMo4, EN 10083), weight (15–80 kg), center distance (100–400 mm), thread size (M20–M80, ISO 68-1), lubrication flow rate (2–10 L/min), and maximum sliding velocity (0.5–2.0 m/s). These values are reference ranges and must be verified for the specific model and application. The crosshead is essential for reliable pump operation, and proper lubrication and maintenance are critical to prevent premature wear and failure. Always consult the legal manufacturer or supplier for model-specific specifications and standards compliance.

Working Principle

The crosshead is connected to the connecting rod via a wrist pin. As the crankshaft rotates, the connecting rod imparts an oscillating, non-linear motion to the wrist pin. The crosshead, constrained within linear guideways or crosshead guides, converts this motion into pure linear, back-and-forth movement. This linear motion is then transferred directly to the plunger rod attached to the other end of the crosshead.

Common Materials

Forged Steel, Ductile Iron, Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stroke Length	50–300 mm	Determines displacement volume
Plunger Diameter	20–150 mm	Matches pump capacity
Maximum Operating Pressure	10–35 MPa	Above 35 MPa requires special seals
Operating Temperature Range	-20–120 °C	Outside range affects lubrication
Surface Roughness (Sealing Surface)	Ra 0.2–0.8 µm	Critical for seal lifeISO 4287
Hardness (Contact Surface)	50–60 HRC	Wear resistanceISO 6508
Material Grade	42CrMo4	High strength alloy steelEN 10083
Weight	15–80 kg	Affects inertia and handling
Center Distance	100–400 mm	Must match pump frame
Thread Size (Plunger Connection)	M20–M80	Standard metric threadISO 68-1
Lubrication Flow Rate	2–10 L/min	Insufficient flow causes overheating
Maximum Sliding Velocity	0.5–2.0 m/s	Higher speeds require better lubrication

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Crosshead Body
The main structural element that houses the wrist pin bore and plunger rod connection, designed to withstand reciprocating loads.

Material: Forged Steel
Wrist Pin (Crosshead Pin) Part
A hardened steel pin that connects the crosshead to the small end of the connecting rod, allowing oscillating motion.

Material: Case-Hardened Alloy Steel
Crosshead Shoe / Slipper Part
A replaceable wear surface, often with a Babbitt metal lining, attached to the crosshead body to interface with the guide and reduce friction.

Material: Steel with Babbitt Lining
Tie Rods / Studs Part
Threaded rods that secure the crosshead assembly together and to the plunger rod.

Material: High-Tensile Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crosshead.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Pump Power End

View system integration details

Manufacturers of Crosshead

Manufacturer profiles associated with Crosshead.

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Frequently Asked Questions

What is the primary function of a crosshead in a reciprocating pump?

The crosshead converts the rotary motion of the crankshaft into linear motion for the plunger or piston, while absorbing side thrust forces to ensure straight-line movement.

What materials are commonly used for crossheads?

Common materials include forged steel, ductile iron, and alloy steel, as listed in the directory.

What are typical stroke length and plunger diameter ranges?

Typical stroke length ranges from 50 to 300 mm, and plunger diameter from 20 to 150 mm, but these must be confirmed for the specific model.

Why is lubrication important for a crosshead?

Proper lubrication reduces friction and wear, preventing overheating and premature failure. The lubrication flow rate should be within the specified range (2–10 L/min) for the application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 5000 psi
flow rate:	Dependent on pump design, typically 0-500 GPM
temperature:	-40°C to 150°C
slurry concentration:	Up to 60% solids by weight

Crosshead

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards