Specification of Cap Nut:
1. Materials:
Carbon Steel, Stainless Steel, Copper and Alloy Steel
2. Standards & Sizes of Cap Nut that we can offer (also provdie non-standards sizes):
DIN917:M4-M24
DIN986:M4-M20

DIN1587:M4-M24

Here is Cap Nut table of standard DIN917:

Here is Cap Nut table of standard DIN917:

Here are Cap Nut table of standard DIN1587:

Here is the Packaging information of DIN1587 Cap Nut: