1)Standard of screw: DIN95/96/97, DIN7995, DIN7997, BS1210, BS1210 Hardened
2)Size: M2-M8, ST2-ST8
3)Material: 6A,8A,brass,stainless steel,aluminum and so on.
4)Surface of screw: plain, zinc Cr+3,Yellow Zinc Cr+6 drum
5)Packing: bulk, box packing
6)grade: 4.8 grade and 8.8 grade