TR Self-Clinch Broaching Stand-off Installation





Self Clinch Broaching Standoff Installation Step 1 Self Clinch Broaching Standoff Installation Step 2 Self Clinch Broaching Standoff Installation Step 3 Self Clinch Broaching Standoff Installation Step 4
Select the appropriate hole size from the table below for the stand-off size required. Punch the hole diameter into the sheet material. Place the stand-off spigot end into the hole on the side opposite the mating face. So that stand-off rests on the serrations.  Ensure both plate and stand-off are aligned along the same axis.  If the stand-off is not seated ‘square’ in the hole, the joint will be imperfect and mating threads will mis-align. Using a profiled punch, apply only sufficient pressure to ‘squeeze’ the stand-off serrations into the parent sheet metal.  The serrations if properly installed will provide torsional (rotational) resistance. After installation the spigot joint should be flush with the sheet metal.
Click on the play button to watch the installation animation.

Using the table below with reference to the specific size of the Hexagon flush nut, 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.   

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


Hole Sizes - Metric (mm)

Thread or Through Hole Size M2.5 M3 M4 3.6 4.2
Minimum rec sheet thickness 1.53 1.53 1.53 1.53 1.53
Hole size +0.08 -0.00 4.22 4.22 6.4 5.4 6.4
Minimum distance to edge of sheet 4.4 4.4 6.4 5.5 7


Hole Sizes - Inch (inches)

Thread or Through Hole Size 4-40   6-32 0.116   0.143
Minimum rec sheet thickness 0.06 0.06 0.06 0.06
Hole Size In Sheet + 0.003 - 0.000 0.166 0.213 0.166 0.213
Minimum distance to edge of sheet 0.17 0.22 0.17 0.22




Broaching Standoff Punch and Anvil


Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.