Mechanical Properties
| Yield Strength (Rp0.2) | Tensile Strength (Rm) | Impact Energy (KV) | Elongation (A) | Reduction of Area (Z) | Brinell Hardness |
| ≥ 440 MPa | ≥ 737 MPa | ≥ 12 J | ≥ 24% | ≥ 14% | ≤ 223 HBW |
Martensitic Stainless Steel Hardened Shafts
420J2 Stainless Steel Shafting AISI 420J2 | UNS S42000
Applications involving wear, repeated contact, and moderate corrosion exposure often require a stainless steel grade with higher hardness and reliable mechanical strength. 420J2 martensitic stainless steel contains approximately 12%–14% chromium and a relatively higher carbon content, giving the material a useful combination of corrosion resistance, strength, and wear resistance after proper processing.
Compass Power Tech manufactures 420J2 stainless steel precision ground shafting for medical instruments, cutting tools, measuring tools, springs used below 300°C, shafts used below 400°C, bolts, valves, bearings, and other precision components requiring stable dimensions and durable surface performance.
This grade is a practical option for customers who need stainless steel shafting with better hardness and wear resistance than general-purpose stainless steel materials, while still maintaining suitable corrosion resistance for many industrial applications.
Chemical Composition (%)
| Grade | C | Si | Mn | P | S | Ni | Cr |
| 420J2 (S42000) | 0.26–0.40 | ≤ 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.
