Ko te matotoru o te porotiti 16b he 17.02mm. E ai ki a GB/T1243, ko te whānui iti rawa o te wāhanga o roto b1 o ngā mekameka 16A me te 16B ko: 15.75mm me te 17.02mm. Nā te mea ko te piko p o ēnei mekameka e rua he 25.4mm, e ai ki ngā whakaritenga o te paerewa ā-motu, mō te porotiti he piko neke atu i te 12.7mm, ka tatauhia te whānui niho bf=0.95b1 penei: 14.96mm me te 16.17mm. Mena he porotiti rarangi kotahi, ko te matotoru o te porotiti (whānui niho katoa) ko te whānui niho bf. Mena he porotiti rarangi rua, rarangi toru rānei, tera atu anō te tātai.
Wā tuku: 31 o Ākuhata-2023