| size | Metric/ Imperial Size |
|---|
| hardness | 4.8、8.8、10.9、12.9， A2-70, A4-80 (304/316) |
|---|
| material | Carbon Steel, Stainless Steel, Brass, Cooper |
|---|
| standard | DIN 6921, ISO 4162, ASME B18.2.1, SAE J429 |
|---|
| surfaceTreatment | Natural, Plain, Oxide Black, Zinc Plated, HDG, Dacromet |
|---|
