420 Stainless Precision Ground Bar

Martensitic Stainless Steel Hardened Shafts

420 Stainless Round Bar AISI 420 | UNS S42000

Higher hardness and wear resistance make 420 stainless steel a practical option for precision components that must withstand friction, movement, and repeated mechanical contact. With proper heat treatment, this martensitic stainless steel grade can provide dependable strength while maintaining corrosion resistance in general industrial environments.

Compass Power Tech manufactures 420 stainless steel precision ground bars for precision machinery, bearings, electrical equipment, instruments, transportation components, household appliances, and other parts requiring a combination of hardness, wear resistance, and dimensional stability.

Mechanical Properties

Tensile Strength (Rm)	Yield Strength (Rp0.2)	Elongation (A5)	Impact Energy (KV)	Hardness (Annealed)	Hardness (Quenched & Tempered)
≥ 635 MPa	≥ 440 MPa	≥ 20%	≥ 63 J	≤ 223 HBW	≥ 192 HBW

Chemical Composition (%)

Grade	C	Si	Mn	P	S	Ni	Cr
420 (S42000)	0.16–0.25	≤ 1.00	≤ 1.00	≤ 0.040	≤ 0.030	≤ 0.60	12.00–14.00

Specifications

Diameter	Tolerance	Roundness	Straightness	Standard Length	Surface Roughness
Φ3-Φ25	0.1mm/m	g6, h6, f7	≤1/2	2m 3m	Ra≤0.4
Φ25-Φ40	0.1mm/m ≤	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ40-Φ80	0.1mm/m ≤	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ80-Φ150	≤0.05mm/m	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ150-Φ180	≤0.05mm/m	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4

Additional Custom Services

Cut-to-length service: Shaft length can be customized according to customer assembly requirements.
End chamfering: Both ends of the shaft can be chamfered to simplify downstream machining and installation.
Drawing-based machining: Shafts can be machined according to customer drawings and supplied as ready-to-assemble components.
Surface rolling treatment: Surface rolling can be applied to improve surface hardness when higher wear resistance is required.

Packaging and Storage

To protect stainless steel precision ground shafting during sea freight and storage, Compass Power Tech uses anti-rust paper tube packaging. Before wrapping, anti-rust oil is applied evenly to the shaft surface, and anti-rust wax is applied inside the paper tube. This protection process helps reduce corrosion risk during transportation and ensures customers receive shafts in stable, ready-to-use condition.

Looking for Custom Metal Components for Your Application?

We manufacture precision ground shafts, stainless steel tubing, piston rods and aluminum alloy cylinder tubes for hydraulic, pneumatic, machinery, energy and transportation applications. Contact us for material selection, specifications and customization support.