Dimensional data for M8 Full-Hex Open-End Blind Rivet Nuts to Trade series (full-hex open-end blind rivet nuts), with the drive and the installation notes for this type. Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M8 Dimensional Row (Trade series (full-hex open-end blind rivet nuts))
| Thread size | Pitch (mm) | Grip ranges (mm) | Installation hole (mm) | Flange diameter (mm) | Typical torque resistance (Nu00b7m) | Material options |
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| M8 | 1.25 | 1.0~3.5 / 3.5~5.5 | 11.0 | 16.0 | 31 | steel or aluminum alloy |
Spanner & Drive for M8 Full-Hex Open-End Blind Rivet Nuts
Drive geometry for M8 Full-Hex Open-End Blind Rivet Nuts is given by the row above; match the tool to the listed values.
Tightening Torque for M8
| Class 8.8 (dry, ~µ 0.125) | ≈ 25 Nm |
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| Class 10.9 (dry, ~µ 0.125) | ≈ 35 Nm |
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| Class 12.9 (dry, ~µ 0.125) | ≈ 41 Nm |
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Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M8
| Tensile stress area As (ISO 898-1) | 36.6 mm² |
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| Proof load, class 8.8 | 21 kN |
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| Proof load, class 10.9 | 30 kN |
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| Proof load, class 12.9 | 36 kN |
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| Min. ultimate tensile, class 8.8 | 29 kN |
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Proof load = stress area × proof stress per ISO 898-1. Design joints so the working preload stays below the proof load of the selected class.
Mating Parts for M8
Pair M8 with the matching M8 bolt or screw, plus a M8 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M8
When the joint preload approaches the proof load of M8 class 8.8, step up to M10 class 8.8 (or move to M8 class 10.9). When the joint is over-specified, M6 often saves weight and cost without losing the safety margin.
Applications & Industries for M8 Full-Hex Open-End Blind Rivet Nuts
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
