Round Serrated Spigot Rivet Bush installation
The round pattern bush features a serrated spigot providing a durable and effective alternative to the hexagon pattern. When installed, the serrations provide discreet anchorage against torsional resistance and pull out loads.
The round pattern is designed to be riveted or ‘peened’ over the sheet metal to provide a strong and reusable thread assembly.
Ensure the correct spigot length has been selected for sheet thickness being used. Select the appropriate hole size from the table below for the bush required. Punch the hole diameter into the sheet material.
Place the sheet metal on the bush so the spigot protrudes through the hole. If the bush is not seated ‘square’ in the hole, the joint will be imperfect and mating threads will misalign.
Using a profiled punch, apply only sufficient pressure to ‘peen’ the spigot over into the sheet metal and allow the serrations on the spigot to embed in the face of the sheet, providing torsional resistance.
Installation animation
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For best torsional and pull-out resistance, the serrated spigot should be embedded in the face of the sheet material and the spigot should be flush with the underside of the sheet after installation. |
Hole sizes - metric (mm)
| Thread form | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | |
|---|---|---|---|---|---|---|---|---|---|---|
| Recommended hole size +0.05 -0.00mm | 5.54 | 5.54 | 6.73 | 6.73 | 7.92 | 9.52 | 12.70 | 15.87 | 19.05 | |
Hole sizes - inches
| Thread form | BSW/F | - | 1/8" | - | 5/32" | 3/16" | 1/4" | 5/16" | 3/8" | 1/2" |
|---|---|---|---|---|---|---|---|---|---|---|
| BA | 8 | 6.5 | 4 | 3 | 2 | - | - | - | - | |
| UNC | 2 | 4 | 6 | 8 | 10 | 1/4" | 5/16" | 3/8" | 1/2" | |
| UNF | 2 | 4 | 6 | 8 | 10 | 1/4" | 5/16" | 3/8" | 1/2" | |
| Recommended hole size +0.002 -0.000" | .218 | .218 | .265 | .265 | .312 | .375 | .500 | .625 | .750 | |
Tooling
Detail 1 - Oil hardening steel 665 M17 (EN34)
Note: 760°C - 780°C oil quench temper 150°C - 200°C
| Punch dimensions | ||
|---|---|---|
| Thread size | A | B |
| M2.5/M3 | 9.05 | 4.39 |
| M3.5/M4 | 10.50 | 5.49 |
| M5 | 12.00 | 6.65 |
| M6 | 14.00 | 8.23 |
| M8 | 16.30 | 11.05 |
| M10 | 21.90 | 14.12 |
| M12 | 25.40 | 16.61 |