Tungsten Carbide Ball and Seat API Standards
Tungsten carbide ball & seat, made from virgin raw materials, have high hardness, wear-resistance, corrosion resistance, and resistance to bending. We are able to supply Carbide Balls in various desired material specifications including TC Cobalt, TC Nickel and TC Titanium, and the TC Balls are manufactured as per ISO and Anti-Friction Bearing Manufacturer Association (AFMBA) standards.
Blank balls and finished balls can be both supplied. Standard and non-standard balls are available.
RECOMMEND GRADES AND SPECIFICATIONS:
| Grade | Binder (Wt %) | Density (g/cm3) | Hardness (HRA) | TRS (≥N/mm²) |
| YG6 | 6 | 14.9 | 90.5 | 2100 |
| YG8 | 8 | 14.7 | 89.0 | 2250 |
| YG11 | 11 | 14.5 | 88.5 | 2600 |
| YG13 | 13 | 14.2 | 87.5 | 2650 |
| YG15 | 15 | 14.0 | 87.0 | 2750 |
| YG20 | 20 | 13.5 | 85.5 | 2850 |
| Grade | Allowable Ball Diameter Variation | Deviation From Spherical Form | Surface Roughness Arithmetical Average | Basic Diameter Tolerance | Allowable Lot Diameter Variation |
| 3 | 3 µ" | 3 µ" | .5µ" | ±30 µ" | 5 µ" |
| .000003" | .000003" | .0000005" | ±.00003" | .000005" | |
| 5 | 5 µ" | 5 µ" | .8 µ" | ±50 µ" | 10 µ" |
| .000005" | .000005" | .0000008" | ±.00005" | .00001" | |
| 10 | 10 µ" | 10 µ" | 1.0 µ" | ±100 µ" | 20 µ" |
| .00001" | .00001" | .000001" | ±.0001" | .00002" | |
| 15 | 15 µ" | 15 µ" | 1.0 µ" | ±100 µ" | 30 µ" |
| .000015" | .000015" | .000001" | ±.0001" | .00003" | |
| 16 | 16 µ" | 16 µ" | 1.0 µ" | ±100 µ" | 32 µ" |
| .000016" | .000016" | .000001" | ±.0001" | .000032" | |
| 24 | 24 µ" | 24 µ" | 2.0 µ" | ±100 µ" | 48 µ" |
| .000024" | .000024" | .000002" | ±.0001" | .000048" | |
| 25 | 25 µ" | 25 µ" | 2.0 µ" | ±100 µ" | 50 µ" |
| .000025" | .000025" | .000002" | ±.0001" | .00005" | |
| 48 | 48 µ" | 48 µ" | 3.0 µ" | ±200 µ" | 96 µ" |
| .000048" | .000048" | .000003" | ±.0002" | .000096" | |
| 50 | 50 µ" | 50 µ" | 3.0 µ" | ±300 µ" | 100 µ" |
| .00005" | .00005" | .000003" | ±.0003" | .0001" | |
| 100 | 100 µ" | 100 µ" | 5.0 µ" | ±500 µ" | 200 µ" |
| .0001" | .0001" | .000005" | ±.0005" | .0002" | |
| 200 | 200 µ" | 200 µ" | 8.0 µ" | ±1000 µ" | 400 µ" |
| .0002" | .0002" | .000008" | ±.001" | .0004" | |
| 300 | 300 µ" | 300 µ" | ±1000 µ" | 400 µ" | |
| .0003" | .0003" | ±.001" | .0004" | ||
| 500 | 500 µ" | 500 µ" | ±2000 µ" | 1000 µ" | |
| .0005" | .0005" | ±.002" | .001" | ||
| 1000 | 1000 µ" | 1000 µ" | ±5000 µ" | 2000 µ" | |
| .001" | .001" | ±.005" | .002" | ||
| 2000 | 2000 µ" | 2000 µ" | ±5000 µ" | 4000 µ" | |
| .002" | .002" | ±.005" | .004" | ||
| 3000 | 3000 µ" | 3000 µ" | ±5000 µ" | 6000 µ" | |
| .003" | .003" | ±.005" | .006" |
