Grade 12.9 Steel Stud Bolt, Double-End — GB/T 901 / DIN 939 (Series 091)

For Stud Bolt, Double-End — GB/T 901 / DIN 939 (Series 091) in Grade 12.9 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 12.9 Steel Stud Bolt, Double-End — GB/T 901 / DIN 939 (Series 091) and lists every size we supply.

Why Choose Grade 12.9 Steel for Stud Bolt, Double-End — GB/T 901 / DIN 939 (Series 091)

The highest common strength class, for high-load machine assembly. For stud bolt, double-end — gb/t 901 / din 939 (series 091), this matters when requires plating or black-oxide protection is the primary requirement.

Mechanical & Physical Properties

Corrosion Behavior in Service

Carbon and alloy steel stud bolt, double-end — gb/t 901 / din 939 (series 091) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.

Galvanic & Galling Considerations

For stud bolt, double-end — gb/t 901 / din 939 (series 091) in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.

Sizes of Stud Bolt, Double-End — GB/T 901 / DIN 939 (Series 091) Available in Grade 12.9 Steel