Bearing Materials & Accuracy Standards: Technical Selection Guide
In high-precision manufacturing, Bearing Materials dictate the ultimate performance ceiling of any rotating assembly. At ZGBK, we prioritize metallurgical purity and geometric precision. Selecting the right alloy—whether it’s high-chrome GCr15 or specialized AISI 440C stainless steel—is essential for achieving the required L10 fatigue life and operational stability in demanding industrial environments.
Table 1. Chemical Composition of Bearing Steel (%)
| No. | C | Mn | Si | Cr | S < | P < | Ni < | Cu < | HB |
|---|---|---|---|---|---|---|---|---|---|
| GCr15 | 0.95-1.05 | 0.20-0.4 | 0.15-0.35 | 1.30-1.65 | 0.020 | 0.027 | 0.3 | 0.25 | 170-207 |
Table 2. International Bearing Steel Contrast
| Country | China | ISO | U.S.A | Germany | Japan | Sweden |
|---|---|---|---|---|---|---|
| Bearing Steel NO. | GCr15 | 683/XVII1 | (AISI)52100 | (Din)100Cr6 | (Jis)SUJ2 | SKF3 |
Table 3. Material Matching of Stainless Steel Bearing Components
| Rings material | Ball material | Cage material |
|---|---|---|
| AISI440C (9Cr18) | AISI440C | AISI304 |
| AISI440B (9Cr18Mo) | AISI420 | Nylon66 |
| AISI304 (1Cr18Ni9) | AISI316 | RS / ZZ4 |
| AISI316 (0Cr17Ni12Mo2) | AISI304 | ZZ AISI304 |
Table 4. Stainless Steel Chemical Composition (%)
| No. | C% | Cr% | Si% ≤ | Mn% ≤ | S% ≤ | P% ≤ | Mo% | Ni% |
|---|---|---|---|---|---|---|---|---|
| AISI 440C | 0.90-1.05 | 17-19 | 0.8 | 0.7 | 0.03 | 0.035 | – | – |
| AISI 440B | 0.75-0.90 | 17-19 | 0.8 | 0.8 | 0.03 | 0.035 | 1-1.3 | – |
| AISI304(304L) | 0.08(0.03) | 18-20 | 1 | 2 | 0.03 | 0.035 | – | 8-10.5(9-13) |
| AISI316(316L) | 0.75-0.90 | 16-18 | 1 | 2 | 0.03 | 0.035 | 2-3 | 10-14 |
Corrosive Resistance Capacity Ranking: AISI 316L > AISI 304L > AISI 316 > AISI 304 > AISI 440B > AISI 440C. Choosing the correct Bearing Materials based on chemical composition ensures structural integrity in specific industrial environments.
Table 5. Contrast of Bearing Accuracy Grade
| Country | Standard | Accuracy Grade | ||||
|---|---|---|---|---|---|---|
| China | GB307.1 | 0 | 6 | 5 | 4 | 2 |
| ISO | ISO | 0 | 6 | 5 | 4 | 2 |
| Sweden | SKF | P0 | P6 | P5 | P4 | P2 |
| Germany | DIN | P0 | P6 | P5 | P4 | P2 |
| Japan | JIS | P0 | P6 | P5 | P4 | P2 |
| U.S.A | ANSI | ABEC1 | ABEC3 | ABEC5 | ABEC7 | ABEC9 |
The Accuracy Grade determines vibration levels and high-speed stability. ZGBK products adhere to ISO 492 standards. For high-speed applications, higher precision like ABEC 5 or ABEC 7 is recommended to reduce noise and friction. By combining premium Bearing Materials with precise accuracy levels, ZGBK delivers industry-leading reliability.
