Izikrufu ezilungisekayo zezimboni ezenziwe nge-chrome vanadium. Kudlula izindinganiso zamazwe ngamazwe ISO 6787-1982, ASME B.107.8M-1996, BS 6333-1995, DIN 3117-1988, JIS B4604-1976. Umhlathi we-15deg uvumela isikrufu ukuthi sisetshenziswe ezindaweni eziwumngcingo njengoba kudingeka ukujika okungu-30deg kuphela. Ukuvuleka komhlathi okubanzi kwandisa ububanzi bosayizi webhawodi okuzosetshenzwa kuwo. Ukungaphumeleli ekugcineni komhlathi onyakazayo kunikeza isenzo esingcono uma isikhala silinganiselwe. Isibambo sihlinzeka ngokulingana kwesandla okunethezekile. Ukuqeda i-phosphate.
| L (mm) | L (intshi) | Amandla (mm) | Amandla (af) | T (mm) | D (mm) | I-ISO Norm (Nm) | Isisindo (g) |
| 375 | 15 | 50 | 1 5/16" | 44 | 100 | 920 | 1200 |