Tank Rivet Bush installation


The round pattern Tank Rivet Bush features a blind tapped hole and plain spigot designed for application in liquid environments. Like the hexagon and round bush, the blind pattern is designed to be riveted or ‘peened’ over the sheet metal to provide a strong and re-usable thread assembly. Applications demanding impervious joints will require additional suitable sealing technologies.

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

Using a profiled punch, apply only sufficient pressure to ‘peen’ the spigot over into the sheet metal, providing Torsional (rotational) resistance. 



Installation animation

Tank Bush Installation Step 5 Tank Bush Installation Step 6 For best torsional and pull-out resistance, the face should be 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 round tank 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. Note it is essential that the recommended hole tolerances be observed.



Hole sizes - metric (mm)

Thread form M3 M4 M5 M6 M8 M10 M12
Recommended hole size +0.05 -0.00mm 5.54 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 6.5 3 2 - - - -
UNC 4 8 10 1/4" 5/16" 3/8" 1/2"
UNF 4 8 10 1/4" 5/16" 3/8" 1/2"
Recommended hole size +0.002 -0.000" .218 .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
M3 9.05 4.95
M4 10.50 6.10
M5 12.00 7.19
M6 14.00 8.64
M8 16.30 11.71
M10 21.90 14.78
M12 25.40 17.86