美国标准
| GRADE | Ball Dia. variation | Deviation from spherical form (U) | Surface roughness (U) | lot Dia. variation (U) | Basic Dia. tolerance (U) | |
| INCH | (U) | |||||
| 3 | .000003 | 0.08 | 0.08 | 0.012 | 0.13 | ±0.75 |
| 5 | .000005 | 0.13 | 0.13 | 0.02 | 0.25 | ±1.25 |
| 10 | .000010 | 0.25 | 0.25 | 0.025 | 0.5 | ±2.5 |
| 16 | .000016 | 0.4 | 0.4 | 0.025 | 0.8 | ±2.5 |
| 24 | .000024 | 0.6 | 0.6 | 0.05 | 1.2 | ±2.5 |
| 48 | .000048 | 1.2 | 1.2 | 0.08 | 2.4 | ±5 |
| 100 | .0001 | 2.5 | 2.5 | 0.125 | 5 | ±12.5 |
| 200 | .0002 | 5 | 5 | 0.2 | 10 | ±25 |
| 500 | .0005 | 13 | 13 | - | 25 | ±50 |
| 1000 | .001 | 25 | 25 | - | 50 | ±125 |
| 2000★ | 50 | 50 | - | 100 | ±125 | |
|
美国标准2000级我公司用于生产研磨用球，抛光用球及未经热处理的软球及半成品球。若客户要求用此标准生产成品球，我公司仍可接受。 WE ONLY USE AFBMA10-1989 GRADE 2000 FOR SUPPLYING GRINDING BALLS, POLISHING BALLS OR SOFT BALLS AND SEMI-FINISHED BALLS THAT ARE NOT HARDENED, WE CAN USE THIS STANDARD TO SUPPLY THE FINISHED BALLS IF CUSTOMER SPECIALLY RQUEST. |
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