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Hydraulic Cylinder Piston and Rods

Hydraulic cylinder pistons and rods are fundamental components that work in tandem to convert fluid power into linear mechanical force and motion. The piston, sealed within the cylinder barrel, acts as the pressure-bearing surface, while the piston rod (or rod) transmits the generated force to the external machine component.

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Description

The performance and longevity of the entire hydraulic cylinder are heavily dependent on the quality and specification of these parts. As detailed in the technical document, piston rods are precision-engineered to exacting standards. They are typically manufactured from high-strength steel grades such as CK45, 42CrMo4, 40Cr, or ST52. These materials are selected for their excellent mechanical properties, including high tensile strength (≥580 MPa) and yield strength (≥350 MPa), ensuring they can withstand significant operational loads and pressures.

A critical feature of the piston rod is its surface treatment. Most are hard chrome plated to a minimum thickness of 20 microns. This chrome layer provides an extremely hard surface (800-1150 HV) for superior wear resistance against seals and environmental contaminants, as well as exceptional corrosion protection. The surface is finely ground and polished to an ultra-smooth finish (Ra ≤ 0.2µm) to minimize friction and prevent damage to the cylinder seals.

Dimensional accuracy is paramount. Rods are produced to strict ISO f7 tolerance limits, with stringent controls on straightness (≤ 0.2mm/1000mm) and roundness. This ensures perfect alignment and smooth, consistent operation without buckling or excessive seal wear.

These components are supplied in various conditions to meet different application needs, including Hard Chrome Plated, Quenched & Tempered (Q&T), or Induction Hardened. The combination of a robust piston and a precisely crafted, durable piston rod is what delivers the reliable, powerful, and efficient performance expected from industrial hydraulic systems in construction, manufacturing, and heavy machinery.

Technical Specification

Product Name	Hard chrome plated Hydraulic cylinder piston rod
Diameters	6-300mm
Length	100mm-1200mm
Steel grade	DIN CK45 JIS 45C ASTM 1045 SAE 1045 AISI 1045
Tolerance	ISO f7
Chrome thickness	20μm(min)
Hardness of the chrome layer	850H V(min)
Roughness	Ra 0.2μm(max)
Straightness	0.2/1000mm
Mechanical Properties(ck45)	Yield strength≥20Mpa Tensile strengh≥80 M p a Elongation≥5%
Supply condition	1.Hard chrome plated
	2.Induction hardened
	3.Quenched & Tempered
	4.Induction hardened with Q&T

Chemical Composition

Material	C%	Mn%	Si%	S%	P%	V%	Cr%
Ck45	0.42-0.50	0.50-0.80	0.17-0.37	≤0.035	≤0.035		≤0.25
ST52	≤0.22	≤1.6	≤0.55	≤0.04	≤0.04	0.02-0.15
20MnV6	0.17-0.24	1.30-1.70	0.10-0.50	≤0.035	≤0.035	0.10-0.20	≤0.30
42CrMo4	0.38-0.45	0.50-0.80	0.17-0.37	≤0.035	≤0.035	0.07-0.12	0.90-1.20
40Cr	0.37-0.45	0.50-0.80	0.17-0.37	≤0.035	≤0.035		0.80-1.10

Mechanical Properties

Material	T.S N/MM2	Y.S N/MM2	E%(MIN)	CHARPY	CONDITION
CK45	610	355	15	>41J	NORMALIZE
CK45	800	630	20	>41J	Q + T
ST52	500	355	22		NORMALIZE
20MnV6	750	590	12	>40J	NORMALIZE
42CrMo4	980	850	14	>47J	Q + T
40Cr	1000	800	10		Q + T

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Induction Hardened Chrome Piston Rod

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