Internal serrated lock washers DIN6798J Size: M1.7-M30 Material: Stainless steel(A2,A4..), carbon steel, Spring steel, 65Mn,Brass ..... Surface:Zinc plating,black,quenching....... Package: Export carton+ pallet Ningbo Zhenhua stamping Co., Ltd. is a proffessional enterprise which specialized in producing cold stamping production. We offer national standard products DIN seriers, nonstandard products, and OEM service . We mainly engaged in manufacturing DIN6797, DIN6798, DIN137, DIN9250,DIN6796,DIN7967, DIN432,NFE25-511, cold stamping,stainless steel stamping,car assessories stamping, and rabidity mould stamping. Besides,we also can manufacture metal stamping products to exat specifications of our clients'