M4 Closed-End Round-Body Blind Rivet Nuts dimensions to Trade series (closed-end blind rivet nuts): coarse thread pitch 0.7 mm. Tighten to approximately 2.9 Nm at property class 8.8 in a dry, as-supplied condition.
- Coarse thread pitch
- 0.7 mm
- Tightening torque (class 8.8)
- 2.9 Nm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
The M4 size of Closed-End Round-Body Blind Rivet Nuts is dimensioned by Trade series (closed-end blind rivet nuts). The table below gives the dimensional row from the standard, followed by the drive and the installation notes for this type.
M4 Dimensional Row (Trade series (closed-end blind rivet nuts))
| Thread size | Pitch (mm) | Grip range (mm) | Installation hole (mm) | Head diameter (mm) | End | Material options |
|---|
| M4 | 0.7 | 0.5~2.5 | 6.1 | 9.0 | closed | zinc-plated steel / stainless steel / aluminum alloy |
Spanner & Drive for M4 Closed-End Round-Body Blind Rivet Nuts
Drive geometry for M4 Closed-End Round-Body Blind Rivet Nuts is given by the row above; match the tool to the listed values.
Tightening Torque for M4
| Class 8.8 (dry, ~µ 0.125) | ≈ 2.9 Nm |
|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 4.1 Nm |
|---|
| Class 12.9 (dry, ~µ 0.125) | ≈ 4.9 Nm |
|---|
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 M4
| Tensile stress area As (ISO 898-1) | 8.78 mm² |
|---|
| Proof load, class 8.8 | 5.1 kN |
|---|
| Proof load, class 10.9 | 7.3 kN |
|---|
| Proof load, class 12.9 | 8.5 kN |
|---|
| Min. ultimate tensile, class 8.8 | 7 kN |
|---|
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.
Installation Tips for M4 Closed-End Round-Body Blind Rivet Nuts
- At M4 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
When to Step Up or Down from M4
When the joint preload approaches the proof load of M4 class 8.8, step up to M5 class 8.8 (or move to M4 class 10.9). When the joint is over-specified, M3 often saves weight and cost without losing the safety margin.
Applications & Industries for M4 Closed-End Round-Body Blind Rivet Nuts
What Closed-End Round-Body Blind Rivet Nuts are specified for, industry by industry. Stocked from M4 to M10.
Industries that specify Closed-End Round-Body Blind Rivet Nuts
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Outdoor enclosures
Cover and bracket attachment points exposed to water and dirt.
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HVAC fabrication
Panel hardware installed after the duct or enclosure has been formed.
-
Refrigeration equipment
Sealed threaded mounting points in formed panels and closed housings.
-
Vehicle bodywork
Blind threads in rails and box sections where the cavity must stay closed.
-
Automotive & transport
Vibration-prone joints where the locking type is specified on the drawing.
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Maintenance & MRO
Replacements matched to the existing bolt class, thread and finish.
Typical applications
- forming the blind bulb within the specified grip range
- choosing steel, stainless steel or aluminum for the service environment
- adding a sealed internal thread from the front face of a panel
- keeping water and debris out of a closed section behind the insert
- joints re-torqued at a service interval
- completing a bolted joint on a stud, rod or bolt
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 drill to the thread minor diameter; the installation hole is set by the body and forming requirements.
Full application guide: where Closed-End Round-Body Blind Rivet Nuts are used, how to specify them, and the cases they are wrong for
