... .Zinc,Nickel plated,Black Oxide,HDG 4.SGS,ISO approve Hard lock nut 1. Standard:DIN, ANSI,BSW, JSB ans ... ,SS316 A4 etc), Brass or according require.3. Grade of Hard lock nut: Metric standard: Grade 4.8, Grade6.8, Grade8 ... , A4-70, A4-804. Size: M3-M64 or as request; Pitch:0.25-6mm5. OEM&Customize non-standard products welcome.6 ... please feel free to contact with us . tel: +86-13428766314 Hard lock nut