... .8,6.8,8.8,9.8,10.9........ Non Standard Fastener,Special Fastener,Iron Fastener.1.What’s the specification of our ... steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon ... professional manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2 ...