1.Material: Gr1, Gr2, Gr3, Gr4, Gr5, Gr7, Gr9, Gr12
2.Standard: DIN 933, 912, 934, 7991
GB/T 13810, 3908,
GB 5780~5782, 5788, 6178~6180
3. Types of the Head: cheese, hexagon, pan
4. Types of the Groove: slot, square socket, phillips recess
5Parts: bolt and nut |