GB/T 5782 black oxide hex 8.8 grade bolt specification

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

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Post time: Dec-31-2021