4140 hard chrome plated rod

Steel 4140 is AISI standard grade, it is a kind of alloy structural steel, equivalent to China standard GB 42CrMo.
SAE 4140 alloy steel has high fatigue strength and low notch sensitivity, high low temperature impact toughness, no obvious temper brittleness, and is mainly used in the quenched and tempered state. It is used to manufacture high-strength parts and parts with large cross-sections and other stress-bearing components under impact load. Such as high strength Hydraulic cylinder rods, penaumatic cylinder rods, the transmission eccentric shaft of the horizontal forging machine, the crankshaft of the forging press, etc.


4140 chrome plated rod is manufactured through SAE 4140 steel bar, by using high precision centerless grinding and polishing methods, and then chrome plated to a min. plating thickness of 20 microns (0.0008″), 25 microns (0.001″), or other. The chrome plating layer provides corrosion resistance and a highly reflective appearance.

4140 chrome plated rods are used widely by the hydraulic industries and pneumatic industries, and is also widely usually used for applications where high yield strength and tensile strength is required.

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Why choose Grand’s 4140 hard chrome bar?

Here below are the main advantages of our products and services.

  • Nearly 20 years production experience for chrome plated rods;
  • Advanced manufacturing equipment and facilities, including: cold drawing machine, straightening machine, polishing machine, heat treatment furnace, grinding machine, etc. Our professional engineers do regular scheduled maintenance on these machines to guarantee them work well.
  • High quality raw material: our raw materials of 4140 chrome plated rods are mainly from the famous China steel makers, such as TPCO, BAO STEEL, SHA STEEL, which are best and largest steel rod manufacturers in China.
  • High precision: Our chrome plated rod are manufactured with high dimension precision, tolerance can be ISO f7, f8 or g6, upon request. Which ensures the precision of the hydraulic cylinder or the machine.
  • Reliable Packing: All the chrome plated shafts will be oiled by the anti-rust oil before packing. And to protect the outer surface of the chroming of piston rods, we will use cardboard tube to pack each rod, and then pack with seaworthy package such as wooden cases or rope wraps.
  • Strictly quality control: Our factory has a QC team of more than 10 persons. All the 4140 chrome bars will be inspected before delivery. The inspections including: Chemical Analysis Test, Tensile Test, Dimension Inspection, Roughness Testing, Chrome plated thickness test and other tests according to standards and cusotmer’s requirements.
  • Mature quality management system: our Total quality management system ensures all the working processes related to product quality are in good control.
We have been exporting our 4140 chrome plated rods to customers in many countries for the applications of hydraulic cylinder rods and shafts for various machines, and other applications.
Typical applications including: Agricultural Equipment, Hydraulic Cylinders, Hoists, Jacks & other Lifting equipment, Machine Tools, Mining and Earth Moving Equipment, Pumps, Waste Disposal Transport and Equipment etc.

Besides 4140 hard chrome plated rods, we also produce 4140 cylinder honed tubes, 4140 chrome plated hollow rods.


4140 hard chrome plated rod is a kind of high strength hard chrome plate rod made of material SAE 4140 steel rod. Our factory is a high quality China 4140 chrome plated rod supplier, we manufacturer and supply a wide size range of hard chrome plated 4140 steel bars, from metric size 10 mm to 500 mm.

Product Name: SAE 4140 hard chrome plated rod


Material: SAE4140 /AISI4140

Size Range: Dia. 10 mm – Dia. 500 mm

Tolerance: ISO f7, h8, g6 on request.

Length:  random length & cut length, max. length upto 12m

Surface Roughness: Max Ra 0.2 μm

Chrome Plated thickness: min. 20 microns, 25 microns, 30 microns, 50 microns

Surface Hardness: Min. 900HV

Packing method:

Supplied in cardboard tubes for protection on outer surface, and then put in wooden cases

Delivery Conditions available:

Hard Chrome Piston Rod ( HRC 15-20)
Quenched & Tempered (Q+T) Rod (HRC 28-32)
Induction Hardened Rod (HRC 55-62)
Q+T Induction Hardened Rod (HRC 60-65)



Below is the chemical composition of 4140 chrome plated rod for shafts.

SAE 4140 C% Si% Mn% P% S% Cr% Mo%
Min 0.36 0.1 0.65 0.75 0.15
Max 0.44 0.4 1.1 0.04 0.04 1.2 0.35

Here below is the mechanical properties of SAE 4140.

4140 Yield strength Tensile Strength Elongation Hardness HB
Min 800 Mpa /115K psi 900 Mpa /130K psi 20% 270 HB

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