Product：hexagon head screws / half thread

Specification：M20-M72

Property Class: ISO898-1  8.8, 10.9

Elongation after fracture

Minimum tensile strength

Lower yield strength or stress ar 0.2% non-proportional elongation

Stress under proof load

Strength under wedge loading

Hardness

Impact strength Kv， min at -20℃

Above property requirements comform to ISO898-1

Thread tolerance：6g,6e,6h

Tolerance standard：ISO 4759-1

Surface defect：ISO 6157-1

Quality management systems: ISO9001