lock washer size :m3--m64 material :Carbon Steel, Alloy Steel, Stainless Steel lock washersize :m4--m64material :Carbon Steel, Alloy Steel, Stainless Steel, Copper, Nylon, Plastic, etccoating :zinc .plain ,HDG Our biggest strength is non-standard product according to your drawing or samples. Product rangeBOLTS: hex bolts, heavy hex bolts, hex flange bolts, carrage bolts, wheel bolts, stud ...