TR Self Clinch Floating Fastener installation

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 size required. Punch the hole diameter into the sheet material.

2 Step 2

Place the nuts spigot end into the hole on the side opposite the mating face. So that nut rests on the serrations. 

3 Step 3

Using a profiled punch with an appropriate collar, apply only sufficient pressure to ‘squeeze’ the nut serrations into the parent sheet metal. 

4 Step 4

The serrations if properly installed will provide torsional (rotational) resistance. After installation the spigot joint should be flush with the sheet metal.



Installation animation


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

For the best dimensional accuracy and therefore performance, TR recommends that all holes in the sheet metal application be punched.

Note it is essential that the recommended Hole tolerances be observed.



Hole sizes - metric (mm)

Thread size and pitch M3 0.5 M4 0.7 M5 0.8 M6 1.0
Min sheet thickness 1 1.4 1 1.4 1 1.4 1.4
Hole size +0.08 -0.00 7.4 9.4 10.31 13.1
min distance to hole c/l to edge 7.62 8.64 9.14 11.0



tool scff1 update 2 Thread
A mm
+/- 0.03
B mm
+/- 0.13
D mm
M3 1.37 6.55 7.37
M4 1.37 6.55 9.28
M5 1.8 6.12 10.29
M6 2.34 5.59 12.96