1.washers:
1)standard
French standard NF( E25-513 NFE25-511), German standard (DIN125A/B, 9021,126,440R , 4)other kinds of fasteners ,such as bolts ,nuts ,screws and thread rods. DIN2093,DIN2095 etc).
American standard (USS/SAE, F/W ), British standard (BS3410 4320 )
Australian standard (AS 1252-1973 etc.)
F959 Loading Indication Washer.
all kinds of non-standard washers .
2)Materials:
mild steel,50#steel,65Mn steel, A2, A3, A4, copper, aluminum etc.
polished, hot dipped galvanized, nickel plated, cadmium plated, zinc plated(in white, yellow, bright, colourful) , tin plated, blackening etc.