1. Da farko, duba kusurwar zare
Hanya mafi daidaito ita ce a auna da ma'aunin zare. 60° na ma'aunin Amurka ne, kuma 55° na ma'aunin Birtaniya ne.
Idan babu kayan aiki, don zaren bututu, za ku iya lura da hanyar rufewa: Zaren NPT na Amurka yawanci suna rufewa da zaren da kansa; Zaren BSP na Burtaniya (kamar BSPT, BSPP) suna da kusurwar zare na 55°, kuma zaren BSPP masu layi ɗaya suna buƙatar dogara da zoben rufewa don rufewa.
2. Sigogi na duba maɓalli (girma da TPI)
Ga masu ɗaurewa kamar ƙusoshi da goro masu haɗin zare, bayan auna babban diamita (diamita na waje na zaren waje / diamita na ciki na zaren ciki), abu mafi mahimmanci shine a ƙidaya adadin zaren a kowace inci (TPI), sannan a duba daidai da littafin jagora.
Ga zaren bututu, ban da auna girman, kuna buƙatar tantance ko zaren ne mai tauri (kamar NPT, BSPT) ko zare madaidaiciya (kamar BSPP), da kuma hanyar rufewa.
3. Duba lambar da aka saba kai tsaye
Idan akwai alamar da aka saba amfani da ita a ɓangaren (kamar UNC, UNF, BSW, BSF, NPT, BSPP, da sauransu), wannan shine tushen da ya fi inganci.
Biyo baya zuwa ga asalin
Tsarin zaren da aka saba amfani da shi a Birtaniya ya samo asali ne daga zaren da Joseph Whitworth ya yi a digiri 55 a shekarar 1841;
William Sellers ne ya gabatar da zaren Amurka na yau da kullun a shekarar 1864 a matsayin zaren digiri 60.
A gaskiya ma, a lokacin Yaƙin Duniya na Biyu, ƙa'idodin Birtaniya da Amurka sun haifar da matsaloli masu yawa ga musayar kayan aiki tsakanin sojojin ƙawancen. Saboda haka, a cikin 1948, Amurka, Burtaniya, da Kanada sun haɗu suka ƙirƙiro ma'aunin zare mai haɗin kai (UNC/UNF).
Abin sha'awa, tun daga shekarar 1961, ƙungiyoyin ƙasa da ƙasa masu dacewa sun amince da ƙa'idar zaren da aka tsara a Burtaniya, ISO R 228. Don haka yanzu, zaren da aka yi amfani da shi a Burtaniya ƙa'ida ce mai ƙarfi a duk duniya.
Lokacin Saƙo: Fabrairu-05-2026
