| GB/T | ASTM | JIS | EN (British) | DIN (German) | France |
|---|---|---|---|---|---|
| GCr15 | AISI 52100 | SUJ2 | EN31 | 1.3505 / Wks 1.3505 | 100C6 |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | |
|---|---|---|---|---|---|---|---|---|---|
| 100Cr6 | 0.93–1.05% | 0.15–0.35% | 0.25–0.45% | ≤0.030% | ≤0.025% | 1.35–1.65% | ≤0.30% | ≤0.30% | ≤0.08% |
| 100C6 | 0.95–1.10% | 0.15–0.35% | 0.25–0.45% | ≤0.030% | ≤0.025% | 1.35–1.65% | ≤0.30% | ≤0.30% | ≤0.10% |
| AISI 52100 | 0.93–1.05% | 0.15–0.35% | 0.25–0.45% | ≤0.025% | ≤0.015% | 1.35–1.60% | ≤0.30% | ≤0.30% | ≤0.10% |
| SUJ2 | 0.95–1.10% | 0.15–0.35% | 0.25–0.45% | ≤0.025% | ≤0.025% | 1.30–1.60% | ≤0.25% | ≤0.25% | ≤0.08% |
| GCr15 | 0.95–1.05% | 0.15–0.35% | 0.25–0.45% | ≤0.025% | ≤0.020% | 1.40–1.65% | ≤0.25% | ≤0.25% | ≤0.10% |
Physical & Mechanical Properties of Heavy-Duty Bearing Steel Balls
| Item | Parameters | ||||
|---|---|---|---|---|---|
| Hardness | HRC 60 -66 | ||||
| Tensile strength | 1600–2000 Mpa | ||||
| Yield strength | 1400–1800 Mpa | ||||
| Elastic modulus | ≈ 190–210 GPa | ||||
| Density | 7.81g/cm³ | ||||
Bearing Steel Ball Size Chart with Inch Conversion and Precision Grades
| Metric Size | Inch Size | Available Precision Grades | Most Requested Grade | Common Applications |
|---|---|---|---|---|
| 1mm | — | G10–G1000 | G100 / G200 | Precision instruments, small components |
| 1.5mm | 1/16" approx. | G100 | Miniature bearings, valves | |
| 2mm | — | G100 | Small bearings, hardware parts | |
| 2.5mm | 3/32" approx. | G100 | Precision components, small mechanisms | |
| 3mm | — | G25 / G100 | Bearings, bicycle parts, machinery | |
| 3.175mm | 1/8" | G25 / G100 | Bearings, casters, automotive parts | |
| 3.969mm | 5/32" | G25 / G100 | Industrial bearings, mechanical parts | |
| 4mm | — | G25 / G100 | Bearings, valves, hardware | |
| 4.763mm | 3/16" | G25 / G100 | Bearings, automotive parts | |
| 5mm | — | G25 / G100 | Machinery, guide rails, valves | |
| 6mm | — | G25 / G100 | Industrial bearings, mechanical assemblies | |
| 6.35mm | 1/4" | G25 / G100 | Rolling bearings, valves, bicycles | |
| 7.938mm | 5/16" | G25 / G100 | Bearing assemblies, machinery | |
| 8mm | — | G25 / G100 | Industrial equipment, valves | |
| 9.525mm | 3/8" | G25 / G100 | Industrial bearings, machinery | |
| 10mm | — | G25 / G100 | Bearings, hardware, mechanical parts | |
| 12.7mm | 1/2" | G25 / G100 | Valves, bearings, grinding media | |
| 15.875mm | 5/8" | G100 / G200 | Heavy-duty industrial use | |
| 19.05mm | 3/4" | G100 / G200 | Large bearings, mechanical parts | |
| 22.225mm | 7/8" | G100 / G200 | Large machinery, valves | |
| 25.4mm | 1" | G100 / G200 | Large machinery, valves, industrial parts |
Lot Diameter Variation & Normal Gauge for Factory-Direct Bearing Steel Balls
| Lot Diameter Variation | Gauges Interval | Preferred Guages | Subguage Interval | Subguages | |
|---|---|---|---|---|---|
| Gade | |||||
| 10 | 0.5 | 1 | -9,-1,0+1,+9 | 0.2 | -0.4, -0.2, 0, +0.2, +0.4 |
| 16 | 0.8 | 2 | -10,-2,0+2,+10 | 0.4 | -0.8,0.40.,+0.4,+0.8 |
| 20 | 1 | 2 | -10,-2,0+2,+10 | 0.4 | -0.8,0.40.,+0.4,+0.8 |
| 24 | 1.4 | 2 | -12,-2,0+2,+12 | 0.4 | -0.8,0.40.,+0.4,+0.8 |
| 28 | 2 | 4 | -16,-4,0+4,+16 | 0.8 | -1.6,-0.80.,+0.8,+1.6 |
| 40 | 3 | 5 | -20,-5,0+5,+20 | 1 | -2,-1,0,+1+2 |
| Ball diameter variation | Spherical deviation | Surface roughness | Diameter variation | Diameter tolerance | |
|---|---|---|---|---|---|
| Grade | Vdws | ΔSph | Ra | Vdwl | Tdn |
| Not Over | |||||
| μm | |||||
| 10 | 0.25 | 0.25 | 0.02 | 0.5 | ±2.5 |
| 16 | 0.4 | 0.4 | 0.032 | 0.8 | ±4 |
| 20 | 0.5 | 0.5 | 0.04 | 1 | ±5 |
| 24 | 0.6 | 0.6 | 0.05 | 1.2 | ±6 |
| 28 | 0.7 | 0.7 | 0.06 | 1.4 | ±7 |
| 40 | 1 | 1 | 0.08 | 2 | ±10 |
| 60 | 1.5 | 1.5 | O.10 | 3 | ±15 |
| 100 | 2.5 | 2.5 | 0.1 | 5 | ±12.5 |
| 200 | 5 | 5 | 0.15 | 10 | ±25 |
| 500 | 12.5 | 12.5 | not specified | 25 | ±50 |
| 1000 | 25 | 25 | not specified | 50 | ±125 |
Extreme Hardness for Bulk Manufacturing: Our precision steel ball factory's quenching ensures wholesale bearing steel balls achieve uniform HRC 60-66, maximizing wear resistance for industrial procurement.
Ultimate Fatigue Resistance from a Source Supplier: Premium 100Cr6 empowers our precision chrome steel spheres against rolling stresses. Partnering with a verified bearing steel balls manufacturer eliminates spalling and extends OEM bearing components lifespan.
Dimensional Stability in Wholesale Orders: Our ISO-certified custom steel ball factory guarantees minimal deformation. Centerless grinding maintains strict G10-G1000 tolerances across all bulk steel ball orders for flawless sphericity.
Exceptional Surface Finish for Global Supply Chains: Multi-stage lapping gives our factory-direct chrome metal balls a mirror-like finish. This minimizes friction, making our industrial-grade steel balls ideal for automotive and motor wholesale buyers.
| Property | Chrome Steel Balls (AISI 52100 / GCr15) | Stainless Steel Balls (304 / 316 / 420 / 440C) |
|---|---|---|
| Material | High-carbon chromium bearing steel | Corrosion-resistant iron-chromium(-nickel) alloy |
| Hardness | HRC 60–66 (highest of all ball materials) | HRC 25–62 (varies widely by grade) |
| Wear resistance & load capacity | Excellent — the default for heavy rolling loads | Fair to good, depending on grade |
| Corrosion resistance | Poor — rusts without oil or coating | Good to excellent |
| Magnetic | Yes (ferromagnetic) | 304 / 316 non-magnetic; 420 / 440C magnetic |
| Max working temp (approx.) | ~120 °C | ~250–400 °C (grade-dependent) |
| Ideal environment | Dry, lubricated, sealed assemblies | Wet, humid, chemical, food, or medical |
Changzhou RISHENG Steel Ball Co., Ltd. is a premier direct manufacturer and trusted wholesale supplier of premium AISI 52100 chrome steel spheres. Operating an advanced precision steel ball factory, we bypass trading middlemen to offer true factory-direct pricing and reliable OEM custom manufacturing for global industrial procurement.
IATF 16949 & ISO 9001 Source Factory: Our custom bearing steel ball manufacturing facility strictly adheres to international quality management systems. We guarantee flawless metallurgical integrity and zero-defect rates for every bulk wholesale order you place.
Advanced Automated Production Line: Our high-end workshop is equipped with state-of-the-art centerless grinders and continuous heat treatment furnaces. As a top-tier precision metal balls manufacturer, we ensure exact G10-G1000 tolerances for your most demanding industrial ball bearing applications.
Global Export & Wholesale Capacity: Every ball we ship passes through the same 14 steps in our Changzhou plant, from
incoming wire inspection to VCI packing. The sequence below is what keeps grade tolerance and HRC 60–66 hardness consistent from one lot to the next.
Secure Inner Packaging for OEM Orders: Balls are packed in poly bags or lined boxes so they cannot impact each other in transit — important at G10–G25, where a single knock can put a ball out of grade.
VCI Anti-Rust Protection for Global Supply Chains: To protect your bulk steel ball procurement against maritime humidity, our bearing steel ball factory applies premium anti-rust oil combined with advanced VCI (Volatile Corrosion Inhibitor) packaging. This strict process guarantees your wholesale AISI 52100 spheres arrive absolutely rust-free and ready for immediate precision bearing assembly.
Export-Grade Palletizing for Direct Sourcing: For large-scale industrial steel ball wholesale, we load thickened corrugated cartons onto reinforced, fumigation-free wooden pallets with high-strength strapping. This heavy-duty export setup ensures safe, long-distance seaworthy shipping directly from our China source manufacturer facility to your global warehouses.
Custom OEM Labeling & Logistics Integration: Material specifications, G10-G1000 precision grades, lot numbers, and quantities are clearly marked. As your dedicated bearing steel balls supplier, we fully support custom barcode labeling to seamlessly integrate the goods into your Tier-1 automotive or OEM mechanical supply chain receiving systems.
After-Sales Service – A professional team is available to assist you at any time.
Strict Quality Control – Each production stage is thoroughly inspected by our QC team.
Professional Packaging – Secure packaging ensures safe delivery.
Free Samples – Available for quality confirmation before purchasing.
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