Round Serrated Face Rivet Bush installation


The round pattern Hanksert® Rivet Bush features a design with the serrations on the contact face for use in applications requiring maximum torsional resistance and a flush fit. Like the hexagon and round bush, the Hanksert® pattern is designed to be riveted or ‘peened’ over the sheet metal to provide a strong and re-usable thread assembly.

1 Step 1

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.

2 Step 2

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.

3 Step 3 - Automated

Using a profiled punch, apply only sufficient pressure to ‘peen’ the spigot over into the sheet metal and allow the serrations on the face to embed in the face of the sheet, providing torsional resistance. 



Installation animation

Serrated face Rivet Bush Installation Step 5 Rivet Bush in Sheet metal For best torsional and pull-out resistance, the serrated face should be fully embedded in the face of the sheet material and the spigot should be flush with the underside of the sheet after installation.

Using the table below with reference to the specific size of the Hanksert® Rivet Bush, select the correct hole size for the installation of the fastener.

For the best dimensional accuracy and therefore performance, TR Fastenings recommends that all holes in the sheet metal application be punched. To install the fastener into the punched hole a profiled punch or a ball bearing of a suitable size is required. 

The profiled punch can be sourced from the TR Fastenings sales team.



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



Round serrated face 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