Ka'idojin da aka fi amfani da su sune kamar haka:
GB-China National Standard (National Standard)
Matsayin Ƙasar Amirka na ANSI (Amurka)
DIN-Jamus National Standard (Jamus Standard)
ASME-American Society of Mechanical Engineers Standard
Ma'aunin Ƙasa na JIS-Japan (Jafananci)
BSW-British Standard Standard
Bugu da ƙari ga wasu nau'i na asali, irin su kauri da kai da gefen gefe, mafi bambancin sashi na ka'idodin da aka ambata don sukurori shine zaren. Zaren GB, DIN, JIS, da dai sauransu duk suna cikin MM (milimita) , gaba ɗaya ake magana da shi azaman zaren awo.Zaren kamar ANSI, ASME, suna cikin inci kuma ana kiran su daidaitattun zaren Amurka.Bayan metric zaren da zaren Amurka, akwai kuma ma'auni na BSW-British, kuma zaren kuma suna cikin inci, wanda akafi sani da zaren Whitworth.
Zaren ma'auni yana cikin MM (mm), kuma kusurwarsa tana da digiri 60.Dukkan zaren Amurka da na Imperial ana auna su cikin inci.Matsakaicin kusurwar zaren Amurka kuma yana da digiri 60, yayin da kusurwar zaren Birtaniyya ke da digiri 55.Saboda nau'ikan ma'auni daban-daban, hanyoyin wakilci na zaren daban-daban su ma sun bambanta.Misali, M16-2X60 yana wakiltar zaren awo.Yana nufin cewa ƙananan diamita na dunƙule shine 16MM, farar shine 2MM, kuma tsawon shine 60MM.Wani misali: 1/4-20X3/4 yana nufin zaren tsarin Burtaniya.takamaiman ma'anarsa shine ƙananan diamita na screw shine 1/4 inch (inch ɗaya = 25.4MM), akwai hakora 20 akan inch ɗaya, kuma tsayin shine 3/4 inch.Bugu da kari, idan kuna son nuna dunkulallun da Amurka ke yi, UNC da UNF galibi ana kara su ne bayan skru na Biritaniya don banbance tsakanin zaren da Amurka ke yi da zare masu kyau da Amurka ke yi.
Yihe Enterprise wani kamfani ne da ya ƙware wajen kera screws AMchine da aka yi a Amurka, ANSI, BS machine screw, bolt corrugated, indlcuidng 2BA, 3BA, 4BA;Mashin da aka yi da Jamusanci DIN (DIN84 / DIN963 / DIN7985 / DIN966 / DIN964 / DIN967);GB Series da sauran nau'ikan daidaitattun samfuran samfuran da ba na yau da kullun ba kamar sukuran injin da kowane nau'in skru na injin tagulla.
Lokacin aikawa: Fabrairu-09-2023