Property Class 12.9 Steel Full-Hex Open-End Blind Rivet Nuts are supplied to ISO 898-1 property class 12.9. Corrosion behaviour is requires plating or black-oxide protection, the material is magnetic, and the usable service range is commonly limited to approx. +300 °C; confirm against the coating and the load. In practice this grade is the highest common strength class, for high-load machine assembly.
- Grade
- ISO 898-1 property class 12.9
- Corrosion resistance
- Requires plating or black-oxide protection
- Magnetic response
- Magnetic
- Service temperature
- commonly limited to approx. +300 °C; confirm against the coating and the load
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
Material specification page for full-hex open-end blind rivet nuts in Property Class 12.9 Steel. Covers the grade designation (ISO 898-1 property class 12.9), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to Trade series (full-hex open-end blind rivet nuts).
Why Choose Property Class 12.9 Steel for Full-Hex Open-End Blind Rivet Nuts
The highest common strength class, for high-load machine assembly. For full-hex open-end blind rivet nuts, 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 |
|---|
Corrosion Behavior in Service
Carbon and alloy steel full-hex open-end blind rivet nuts 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 Full-Hex Open-End Blind Rivet Nuts, 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 Full-Hex Open-End Blind Rivet Nuts Available in Property Class 12.9 Steel
| Thread size | Pitch (mm) | Grip ranges (mm) | Installation hole (mm) | Flange diameter (mm) | Typical torque resistance (Nu00b7m) | Material options |
|---|
| M4 | 0.7 | 0.5~2.0 | 6.0 | 9.0 | 4 | steel or aluminum alloy |
| M5 | 0.8 | 0.5~2.5 / 2.5~5.0 | 7.0 | 10.0 | 6.5 | steel or aluminum alloy |
| M6 | 1.0 | 0.5~3.0 / 3.0~5.5 | 9.0 | 12.7 | 12 | steel or aluminum alloy |
| M8 | 1.25 | 1.0~3.5 / 3.5~5.5 | 11.0 | 16.0 | 31 | steel or aluminum alloy |
| M10 | 1.5 | 1.0~3.5 / 3.5~6.0 | 12.0 | 18.0 | 42 | steel or aluminum alloy |
Applications & Industries
Where Full-Hex Open-End Blind Rivet Nuts are used, and what decides the specification in each case. Stocked from M4 to M10.
Industries that specify Full-Hex Open-End Blind Rivet Nuts
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Trailer manufacturing
High-torque blind threads in rails and box sections.
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Electrical enclosures
Removable covers attached to thin steel or aluminum sheet.
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Solar equipment
Serviceable bracket threads in thin profiles and formed frames.
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Industrial machinery
Blind mounting points where the full-hex body must resist spin.
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Building services
Threaded rod, channel and suspension assemblies.
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Machine building & OEM
The clamping counter-face on studs and bolts throughout an assembly.
Typical applications
- resisting insert rotation with a full-hex body in the installation hole
- providing a reusable open thread without access to the back face
- specifying hole diameter, grip range and torque resistance together
- installing a threaded point after a panel or tube is closed
- completing a bolted joint on a stud, rod or bolt
- locking an adjustment so it cannot drift
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Match the class
- A nut below the bolt property class strips before the bolt reaches its own limit — pair class 8 nuts with 8.8 bolts, class 10 with 10.9.
Where to use something else
- Do not use the typical torque resistance as a substitute for the parent-sheet grip and hole limits.
Full application guide: where Full-Hex Open-End Blind Rivet Nuts are used, how to specify them, and the cases they are wrong for
