... GB,ISO.DIN.JIS,ANSI,BS,UNI,AS,etc and non-standard nuts;3.size range:Mm3-Mm36;4.we manufacture ... non-standard nuts according to customers'drawings or samples;5.grade: ... .surface:hot treatment;10.our main products include flat washer,spring washer,metal washer,etc;11.competive price for FOB or ... any quality problem we pay for the loss at once; Spring Washer