Ụzọ ntụgharị n'etiti metric na eriri inch jikọtara ọnụ

Eriri bụ okirikiri okirikiri ejiri jikọọ bolts na mkpụrụ. Na mba na mpaghara dị iche iche, A na-eji ụkpụrụ eri dị iche iche. Imperial na metric bụ ụkpụrụ abụọ a na-ahụkarị.
Na ọkọlọtọ Britain, nkọwapụta eri nkịtị bụ UNC na UNF. UNC bụ mbiri nke Unified National Coarse, nke na-ezo aka na eri siri ike nke mba jikọtara ọnụ; UNF bụ mbiri nke Unified National Fine, nke na-ezo aka n'otu n'otu ezi eri nke mba. Ọmụmaatụ, UNC 1/4-20 pụtara otu mba keadighi rarii eri na pitch nke 20 TPI (eri kwa inch) na dayameta nke 1/4 inch.

A na-eji eri jikọtara sistemu inch n'ọtụtụ ebe na mba sistemu inch. A na-ekewa ụdị eri a ụzọ atọ: usoro nke siri ike UNC, usoro nke ọma UNF, extra fine thread series UNFF, gbakwunyere usoro ihe ngosi a kapịrị ọnụ UN.

Usoro akara: Dayameta eri eri - ọnụọgụ eri kwa inch; Usoro koodu-ezi ọkwa

Ọmụmaatụ: Usoro nha nha 3/8-16 UNC-2A

Ezi usoro eze 3/8-24 UNF-2A

Usoro nha nha nke ọma 3/8-32 UNFF-2A

Usoro ihe ngosi 3/8—20 UN—2A

Ọnụọgụ mbụ 3/8 na-anọchi anya dayameta mpụta nke eri na sentimita. Ka ịgbanwee gaa na metric unit mm, mụbaa site na 25.4, ya bu, 3/8×25.4= 9.525mm; nkeji nke abụọ na nke atọ 16, 24, 32, na 20 bụ Ọnụ ọgụgụ ezé kwa inch (ọnụ ọgụgụ nke ezé na ogologo nke 25.4mm); koodu ederede ka nkeji nke atọ gachara, UNC, UNF, UNFF, NA, bụ koodu usoro, na ọnụọgụ abụọ ikpeazụ, 2A, bụ ọkwa ziri ezi.

Edebere ya n'ụkpụrụ eri jikọtara ọnụ na nha n'aha nwere ike ịnwe ọkwa dị iche iche. Ọmụmaatụ, 1/2 nwere 13 ezé, 16 ezé, 20 ezé, na 32 ezé. Ọkọlọtọ ahụ kwuru na 13 ezé bụ akwa ezé na 20 ezé bụ ezi ezé. 28 ezé bụ ultra-ezi ezé; 16 ezé na 32 A na-akpọ ezé ezé abụọ mgbe niile, nke na-adịghị iche n'ezi ezé na ezi ezé.