Ngwa nchekwa API 7K maka ọrụ eriri ọkpọkọ
Ihe njide nchekwa bụ ngwaọrụ maka ijikwa ọkpọkọ njikọ mmiri na olu ọkpọkọ mmiri. E nwere ụdị ihe njide nchekwa atọ: Ụdị WA-T, Ụdị WA-C na Ụdị MP.
Usoro Nkà na ụzụ
| Ụdị nlereanya | ọkpọkọ OD(n'ime) | Ọnụọgụgụ nkeNjikọ yinye | Ụdị nlereanya | ọkpọkọ OD(n'ime) | Ọnụọgụgụ nkeNjikọ yinye |
| WAT | 1 1/8-2 | 4 | MP-S | 2 7/8-4 1/8 | 7 |
| 4-5 | 8 | ||||
| MP-R | 4 1/2-5 5/8 | 7 | |||
| 2 1/8-3 1/4 | 5 | 5 1/2-7 | 8 | ||
| 6 3/4-8 1/4 | 9 | ||||
| 3 1/2-4 1/2 | 6 | 9 1/4-10 1/2 | 10 | ||
| MPM | 10 1/2-11 1/2 | 11 | |||
| WA-C | 3 1/2-4 5/8 | 7 | 11 1/2-12 1/2 | 12 | |
| 4 1/2-5 5/8 | 8 | 12 1/2-13 1/2 | 13 | ||
| 5 1/2-6 5/8 | 9 | 13 5/8-14 3/4 | 14 | ||
| 6 1/2-7 5/8 | 10 | 14 3/4-15 7/8 | 15 | ||
| 7 1/2-8 5/8 | 11 | MPL | 15 7/8-17 | 16 | |
| 8 1/2-9 5/8 | 12 | 17-18 1/2 | 17 | ||
| 9 1/2-10 5/8 | 13 | 18 1/8-19 3/8 | 18 | ||
| 10 1/2-11 5/8 | 14 | MP-XL | 19 3/8-20 3/8 | 19 | |
| 111/2-125/8 | 15 | 20 3/8-21 1/2 | 20 | ||
| 12 1/2-13 5/8 | 16 | 21-22 5/8 | 21 | ||
| 13 1/2-14 5/8 | 17 | 225/8-23 3/4 | 22 | ||
| 233/4-24 7/8 | 23 | ||||
| 14 1/2-15 5/8 | 18 | 24 7/8-26 | 24 | ||
| 26-27 1/8 | 25 | ||||
| 29 3/8-30 1/2 | 28 | ||||
| 35-36 1/8 | 33 |
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