Nkọwa nkenke:

Ihe mkpuchi isi nke hexagonal na isi ihe (cylinder) ya na ihe ndozi na mpụga n'akụkụ abụọ, jiri nut na-ejigide akụkụ abụọ ahụ na oghere, enwere ike kewaa arụmọrụ ha 4.8, 6.8, 8.8, 10.9, 12.9, were gabazie, karịa 10 ọkwa, gụnyere a 8.8 na n'elu bolt mebere ala carbon alloy nchara na ọkara carbon nchara na okpomọkụ ọgwụgwọ (quenching na tempering), mara dị ka elu ike bolts, ndị ọzọ na-akpọ nkịtị bolts. Aha Hegzagon bolt Size M6, M8, M10 10 M12 ...