Grade 12.9 Steel Internally Threaded Dowel Pin

Grade 12.9 Steel Internally Threaded Dowel Pin are stocked to GB/T 120.1 / ISO 8735. The grade provides requires plating or black-oxide protection and is magnetic; the practical service range is up to approx. +300 °C. Property data, grade comparison and the full size table follow.

Why Choose Grade 12.9 Steel for Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099)

The highest common strength class, for high-load machine assembly. For internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099), this matters when requires plating or black-oxide protection is the primary requirement.

Mechanical & Physical Properties

Corrosion Behavior in Service

Carbon and alloy steel internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099) 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 internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099) 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 Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099) Available in Grade 12.9 Steel