Amabakala aphezulu ebholithi aveliswe ngumzi-mveliso wethu aquka imetric 8.8, 10.9, 12.9, ASTM standard UNC Gr5, 8 grade. Amantongomane aphezulu aquka i-metric 8 kunye ne-10 amabakala, kunye ne-ANSI ibakala eliqhelekileyo lesi-5 kunye ne-G8, zonke ezifuna unyango olushushu.