Umehluko phakathi kweketanga le-12B neketanga le-12A

1. Amafomethi ahlukene

Umehluko phakathi kochungechunge lwe-12B kanye nochungechunge lwe-12A ukuthi uchungechunge lwe-B lungolwasebukhosini futhi luhambisana nemininingwane yaseYurophu (ikakhulukazi yaseBrithani) futhi luvame ukusetshenziswa emazweni aseYurophu; uchungechunge lwe-A lusho i-metric futhi luhambisana nemininingwane yosayizi wezindinganiso zochungechunge lwaseMelika futhi luvame ukusetshenziswa e-United States naseJapan nakwamanye amazwe.

2. Osayizi abahlukene

Iphimbo lamaketanga amabili lingu-19.05MM, kanti amanye amasayizi ahlukile. Iyunithi yenani (MM):

Amapharamitha eketanga angu-12B: ububanzi be-roller bungu-12.07MM, ububanzi bangaphakathi besigaba sangaphakathi bungu-11.68MM, ububanzi be-pin shaft bungu-5.72MM, kanti ubukhulu be-chain plate bungu-1.88MM;
Amapharamitha eketanga angu-12A: ububanzi be-roller bungu-11.91MM, ububanzi bangaphakathi besigaba sangaphakathi bungu-12.57MM, ububanzi be-pin shaft bungu-5.94MM, kanti ubukhulu be-chain plate bungu-2.04MM.

3. Izidingo ezahlukene zokucaciswa

Amaketanga ochungechunge lwe-A anesilinganiso esithile kuma-roller nama-pin, ukujiya kwepuleti leketanga langaphakathi kanye nepuleti leketanga langaphandle kuyalingana, futhi umphumela wamandla alinganayo wamandla aqinile utholakala ngokulungiswa okuhlukile. Kodwa-ke, akukho silinganiso esicacile phakathi kosayizi oyinhloko kanye ne-pitch yezingxenye zochungechunge lwe-B. Ngaphandle kwencazelo ye-12B ephansi kunochungechunge lwe-A, ezinye izincazelo zochungechunge lwe-B ziyafana nemikhiqizo yochungechunge lwe-A.