Bambanci tsakanin sarkar 12B da sarkar 12A

1. Tsarin daban-daban

Bambancin da ke tsakanin sarkar 12B da sarkar 12A shine cewa jerin B na mulkin mallaka ne kuma ya dace da ƙayyadaddun Turai (galibi na Burtaniya) kuma ana amfani da shi gabaɗaya a ƙasashen Turai; jerin A yana nufin ma'auni kuma ya dace da ƙayyadaddun girman ma'aunin sarkar Amurka kuma ana amfani da shi gabaɗaya a Amurka da Japan da sauran ƙasashe.

2. Girma daban-daban

Girman sarƙoƙi biyu shine 19.05mm, sauran girman kuma sun bambanta. Nau'in ƙima (MM):

Sigogi na sarkar 12B: diamita na abin naɗin shine 12.07MM, faɗin ciki na ɓangaren ciki shine 11.68MM, diamita na shaft ɗin fil shine 5.72MM, kuma kauri na farantin sarkar shine 1.88MM;
Sigogi na sarkar 12A: diamita na abin naɗin shine 11.91MM, faɗin ciki na ɓangaren ciki shine 12.57MM, diamita na shaft ɗin fil shine 5.94MM, kuma kauri na farantin sarkar shine 2.04MM.

3. Bukatun ƙayyadaddun bayanai daban-daban

Sarƙoƙin jerin A suna da wani rabo na naɗewa da fil, kauri na farantin sarƙar ciki da farantin sarƙar waje daidai yake, kuma ana samun tasirin ƙarfi daidai na ƙarfin da ke tsaye ta hanyar daidaitawa daban-daban. Duk da haka, babu wani rabo bayyananne tsakanin babban girma da matakin sassan jerin B. Banda ƙayyadaddun 12B wanda ya fi ƙasa da jerin A, sauran ƙayyadaddun 12B na jerin B iri ɗaya ne da samfuran jerin A.