based on the request from our customer, zbrf developed production of stainless curved bolt and spear bolts for tunneling in underground contruction. there are m27 and m30 at the moments, more size are available according to request from clients.
we developed and produce m27 and m30 stainless steel bolt, a2-70, a4-80
based on the request from our customer, zbrf developed production of stainless curved bolt and spear bolts for tunneling in underground contruction. there are m27 and m30 at the moments, more size are available according to request from clients.
material for bolts could be 316l, mechanical property could be upto requirements of a2-70 or a4-80.
tensile strength of bolt with hex nut could be upto 321kn.
hardness of washer could be more than 200hv.