Heavy Hex Nut / Hex Nut

- ASTM / ASME A194: 2H, 2HM, Gr 4L,   Gr 7, 7M, 6, 8, 8A, 8M, 8MA,
  8C, 8CA,   8T
- A563 / A563M, UNI5587 2H
- DIN6915, JIS1181
- DIN934 Gr8, Gr10