Square head nuts

1)Description: square head nuts2) Standard:DIN,ANSI/ASME,BS,AS3) Nominal size:M3-M36 1/4- 1-1/2''''inch4) Surface: black,yellow zinc, white zinc, white blue zinc, H.D.G. , Dakeluo .5) Grade ofstrength: 4, 6, 8,10,12(2,5,8)6) Materials:SWRCH8A, SWRCH35K, Q195LY,35#, 45#, 40CrMo......7) Packing:Paper carton or bag in a stronger pallet.8) We can produce theNon-standard fasteners according to drawings or the samples.