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

Specifying Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099) in Grade 12.9 Steel pairs the dimensional form of Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099) (GB/T 120.1 / ISO 8735) with the engineering properties of Grade 12.9 Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.

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.

Comparable Grades

For Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099), class 8.8 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.

Sizes of Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099) Available in Grade 12.9 Steel