thin flat washer 1.material:rubber,nbr,ptfe 2.various size 3.place of ... , BS, IFI, JIS, ISO,GB,ANSI,ASME,Non-Standard2. Material: 1) Carbon Steel 2) Alloy Steel 3) Stainless Steel 4) Brass ... Clear 2) Zinc Yellow 3) Black 4) Nickel-plating4 Type 1) Spring washers 2) Flat washers(plain washer,IFI,ASTM) 3) ...