... .8,8.8,9.8... WASHER,LOCK WASHER ,SPRING LOCK WASHERS. A good non-standard fastenerS manufacturer for your better choice ... specification of our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such ... ...Stainless steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good ...