
Usoro nke UC na-ezo aka na ahaziri ahazi, ejiri ọtụtụ ebe Ohiri isi ngọngọ nkeji bọọlụ nwere aka nkwụnye aka. N'ime isi ha bụ bọọlụ nwere oghere dị omimi nke nwere a dayameta mpụta okirikiri (SPB) emebere ka ọ dabara n'ime oghere okirikiri dabara adaba nke ụlọ nkedo. Na-akwado metric akụkụ, A na-ahazi usoro isiokwu a maka ngwa mmepụta ihe na-achọ ikike ibu dị elu, nrụnye kwụ ọtọ, na arụmọrụ a pụrụ ịdabere na ya.
| ISO | UCFA204 | |
| Nrụpụta Mba. | UC204 | |
| Ebe obibi | FA204 | |
| Obere dayameta | d | 20 mm |
| Ogologo ụlọ, obosara ma ọ bụ dayameta | a | 3-55/64 nke |
| Ebe dị anya n'ịtinye oghere | e | 3-5/64 nke anụ ọhịa |
| Ebe dị anya na-agbago elu ruo n'etiti ibu | i | 19/32 nke |
| Ogologo ụkwụ ụlọ / elu flange | g | 15/32 nke |
| Ogologo ụlọ | I | 1 in |
| Obosara oghere oghere | s | 25/64 nke |
| Obosara ụlọ / dayameta | b | 2-3/8 n'arọ |
| Ngụkọta elu site na mgbago elu | z | 1-5/16 nke |
| Ebe dị anya n'ịtinye oghere | f | 1-37/64 nke |
| Obosara ụlọ na oghere oghere | c | 1-31/32 nke |
| Obosara mgbanaka ime | B | 1.2205 n'arọ |
| Anya ihu akụkụ/ebe etiti | n | 0.5 nke anụ ọhịa |
| Nha Bolt | 5/16 | |
| Ibu ibu | 0,42 n'arọ | |