Property Class 12.9 Steel Triangular-Socket Security Bolts are supplied to our own published dimensions — this is a trade-series article rather than one covered by a dimensional standard, so confirm the figures against the part you are replacing. The grade provides requires plating or black-oxide protection and is magnetic; the practical service range is commonly limited to approx. +300 °C; confirm against the coating and the load.
Why Choose Property Class 12.9 Steel for Triangular-Socket Security Bolts
The highest common strength class, for high-load machine assembly. For triangular-socket security bolts, this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating or black-oxide protection |
Galvanic & Galling Considerations
For triangular-socket security bolts 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.
Comparable Grades
For Triangular-Socket Security Bolts, 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 Triangular-Socket Security Bolts Available in Property Class 12.9 Steel
| Drive | Head style options | Matching tool | Material options | Typical use |
|---|---|---|---|---|
| three-sided socket | button / countersunk / hex flange | triangular security driver | carbon steel or stainless steel | outdoor equipment enclosures |
| three-sided socket | button / countersunk / hex flange | triangular security driver | carbon steel or stainless steel | cabinets and access panels |
| three-sided socket | button / countersunk / hex flange | triangular security driver | carbon steel or stainless steel | signage and street furniture |
Dimensions are independent of the material: every size above is available in Property Class 12.9 Steel.
Custom manufacturing · Made to drawing
Need this bolt in a grade that is not listed?
Grade 12 9 Steel is one of the grades the catalog describes. Where the standard stops, the drawing takes over: fine pitches, left-hand threads, partial threading, and property classes above the catalogued grade where material and heat treatment allow. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
