Coach car
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40CrMo
made knurl studs for wheel are widely used on wheel hub and Wheel Adapter.at least class 10.9.
XS
wheel bolts are made from 40Cr or 40CrMo by cold extrusion machine and chrome
layer gives the brilliant appearance with grade 10.9 strength, there are
conical seat, radius seat, and Allen key style.
Wheel Bolt, Wheel Stud, Standoff Bolt, Screw Stud, Knurled Stud Ningbo Xiangsheng Auto Parts Co., Ltd. , https://www.partsaa.com
Equipped with auxiliary brakes, reversible seats, rear pedals and other devices, it is used for car-dedicated job vehicles for driving school and transportation industry teaching. 
top quality steel from steel for all lug bolts,
and wheel locks. All lug bolts and wheel locks are COLD FORGED and
are tempered to strength class 10.9.
