A2 STAINLESS HEX LOCK NUTS SCREW NUT BOTH FINE PITCH & LEFT HAND THREADED M8-M20 

A2 304 Stainless Steel  

Both left hand thread and fine/coarse pitch 

M2-M24   (Eg: M4 Nut: Thread diameter is 4mm, suit for M4 screws/bolt)

Type of Stainless Steel:

- 201 Stainless Steel (SUS), suitable for use in a dry environment, it is easy to rust with water.

- 304 Stainless Steel (A2), outdoor or humid environment, resistant to corrosion and acid.

- 316 Stainless Steel (A4), added molybdenum, more corrosion resistance and pitting resistance, especially suitable for seawater and chemical media.