nylon lock nut material:steel standard:DIN985,DIN982 size:M4-M39 finish:zinc plated,etc. nylon lock nutSpecifications Material: carton steel,stainless steelSize: M5-M72 Finish:Zinc plated/Plain Head:hex,round or squareMaterial: carton steel,stainless steelSize: M6-M72 Finish: zinc plated/plainHead:hex,round or square packing:25kgs/ctn, or according to your requirement nylon lock nut