Yemiqadi yokuhlangana ene-grooved iphantsi koxinzelelo lwangaphakathi kunye namandla okugoba angaphandle ngexesha lenkonzo. I-ASTM F1476- 07 ichaza ukudityaniswa okungqongqo njengendibaniselwano apho kungekho nto ifumanekayo yokuhamba ngokukhululekileyo kwe-angular okanye i-axial umbhobho kunye nokudibana okuguqukayo njengendibaniselwano apho kukho khona
intshukumo yombhobho ye-angular kunye ne-axial.