Ma bawuti amatanthauzidwa mu ANSI B1.13M ya Grade 6 g tolerances.Zinthu za bolt zimayenderana ndi ASTM F568M ya Kalasi 4.6.Zopangira ma bolt osamva dzimbiri zimayenderana ndi ASTM F 568M ya Gulu 8.83.mabawuti.Chithandizo chapamwamba chidzatsata AASHTO M232.
