| GB/T | ASTM | EN | AFNOR | GOST |
|---|---|---|---|---|
| 420 | AISI420 | 1.4034 | Z34C14 | 40kh13 |
| Code | C | Si | Mn | P | S | Cr | Ni | |
|---|---|---|---|---|---|---|---|---|
| 420 | 3Cr13 | 0.28–0.36% | ≤0.8% | ≤1.0% | ≤0.04% | ≤0.03% | 12.0–14.0% | |
| 420C | 4Cr13 | 0.40–0.45% | ≤1.0% | ≤1.0% | ≤0.04% | ≤0.03% | 12.0–14.0% | ≤1.0% |
| 5Cr13 | 0.46% | ≤1.0% | ≤1.0% | ≤0.04% | ≤0.03% | 13% |
| Item | Parameters | ||||
|---|---|---|---|---|---|
| Tensile strength | 280,000 psi | ||||
| Yield strength | 270,000 psi | ||||
| Elastic modulus | 29,000,000 psi | ||||
| Density | 0.275 lbs/cubic inch | ||||
| Ball diameter variation | Spherical deviation | Surface roughness | Diameter variation | Diameter tolerance | |
|---|---|---|---|---|---|
| Grade | Vdws | △Sph | Ra | Vdwl | Tdn |
| Not Over | |||||
| μm | |||||
| 10 | 0.25 | 0.25 | 0.02 | 0.5 | * |
| 16 | 0.4 | 0.4 | 0.032 | 0.8 | * |
| 20 | 0.5 | 0.5 | 0.04 | 1 | * |
| 24 | 0.6 | 0.6 | 0.05 | 1.2 | * |
| 28 | 0.7 | 0.7 | 0.06 | 1.4 | * |
| 40 | 1 | 1 | 0.08 | 2 | * |
| 60 | 1.5 | 1.5 | 1 | 3 | * |
| 100 | 2.5 | 2.5 | 0.1 | 5 | ±12.5 |
| 200 | 5 | 5 | 0.15 | 10 | ±25 |
| 500 | 12.5 | 12.5 | * | 25 | ±50 |
| 1000 | 25 | 25 | * | 50 | ±125 |
We begin with premium-grade AISI 420 wire. The wire is cut to precise lengths and forged into rough 420 stainless steel spheres between two hemispherical dies under immense pressure.
Our heavy-duty cold-heading machinery ensures continuous, high-volume production without compromising the structural density of the martensitic steel. This guarantees consistent mechanical properties across large wholesale orders.
The newly forged, unhardened 420 steel balls are rolled between heavy cast-iron plates under high pressure. This step removes the "equator" seam (flashing) created during cold heading.
Soft grinding improves the initial sphericity of the AISI 420 balls and relieves internal surface stresses, creating a perfectly uniform foundation before the critical heat treatment and hardening phase.
The now-hardened magnetic 420 stainless balls undergo intense grinding using specialized abrasive ceramic wheels. This process removes any decarburized surface layers left by the heat treatment.
This is where raw material becomes a precision component. We grind our high-hardness steel balls down to exact micrometer tolerances, easily achieving precision grades from G10 to G100 based on your engineering requirements.
Polishing ball process is to initially polish the ball blank into a circle. It's a very important process.
We pass the polished 420C stainless balls through automated ultrasonic cleaning lines using eco-friendly, industrial-grade solvents to strip away all polishing compounds and residual machining oils.
We deliver 100% residue-free products. Cleanliness is paramount for buyers integrating our stainless steel spheres into sensitive pneumatic valves, food-processing machinery, or measuring instruments.
Because 420 stainless steel balls are magnetic, they are carefully separated and passed through precision roller-sorting machines and automated optical inspection systems.This guarantees zero defects. We strictly sort out any out-of-round pieces, microscopic surface scratches, or size variations, ensuring every wholesale 420 stainless steel ball you receive is dimensionally identical.
In our state-of-the-art laboratory, QA engineers use high-end measuring instrumentation—including roundness testers, surface roughness meters, and Rockwell hardness testers—to validate every batch of AISI 420 spheres.Data-backed reliability. We supply comprehensive Material Test Reports (MTR) and Certificates of Conformance (CoC) with every shipment, proving that your custom 420 steel balls perfectly match the requested chemical composition, hardness, and precision grade.
420/420C can be a practical choice when a project requires a hardened stainless ball but does not require the higher hardness and higher cost of 440C. For a detailed comparison, read 420 vs 440C Stainless Steel Balls.
Standard sizes range from 0.8 mm to 25.4 mm, with grades from G10 to G1000 evaluated according to the project requirement. RISHENG can also discuss inch sizes, custom packing and OEM supply.
4.420 Hardened Stainless Steel Guide Rail Balls — CNC Linear Guide, Drawer Slide & Precision Linear Motion Applications
HRC 50–55 hardness resists Brinelling (permanent raceway indentation) under shock and sustained loading — the primary failure mode for softer balls in linear guide rail systems. Used in CNC machine tool linear guides, robotic arm rails, precision linear actuators, and industrial drawer slides. Precision grades G10–G100, diameter tolerances to ±2μm.
Changzhou Risheng Steel Ball Co., Ltd. is located on the eastern shore of Taihu Lake, adjacent to Shanghai, with convenient transportation. Since its establishment in June 1995, the company has been dedicated to developing and manufacturing steel balls, integrating research and development with trade.
For many years, Risheng building on the foundation of the Wujin Metal Ball Research Institute, has been committed to researching steel ball manufacturing technology. We primarily produce bearing steel balls (AISI 52100), stainless steel balls (AISI 201/304/316/420/440/430), and carbon steel balls (AISI 1015/1045/1085) with diameters ranging from 0.8mm to 25.4mm, with precision grades up to G10, G40, and G100. We also offer custom specifications for alloy steel balls, military steel balls, copper balls, UFO balls, ceramic balls, and other metal balls.
High-strength inner packaging: Shockproof foam bags or custom plastic boxes are used to secure each 420/420C stainless steel ball in place, protecting it from impacts and scratches.
Moisture-proof protection: A moisture-proofing agent is added to effectively prevent the impact of moisture on the product during transportation.
Sturdy outer packaging: Thickened corrugated cardboard boxes or wooden pallets (for large orders) are used to ensure safe long-distance transportation.
Clear labeling: Product specifications, quantity, and drop warnings are clearly marked on the outer packaging box for easy verification and safe handling.
FAQ of 420/420C Stainless Steel Ball
Material Test Reports, Certificates of Conformance, hardness reports and inspection records can be supplied according to the confirmed order specification.
420 stainless steel has moderate corrosion resistance but is not the preferred choice for seawater, salt spray or high-chloride environments. For those conditions, 316 stainless steel balls are usually more suitable.
420/420C offers a balance of hardness, wear resistance and cost. 440C generally provides higher hardness and wear resistance, but normally costs more. The final choice depends on the required load, corrosion environment and budget.
Yes. 420 and 420C are martensitic stainless steels and are magnetic. This makes them suitable for applications where magnetic response is required.
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