TR Self Clinch Blind Standoff installation

1 Step 1 Blind Standoff Step 1

Select the appropriate hole size from the table below for the standoff size required. Punch the hole diameter into the sheet.

2 Step 2 Blind Standoff Step 2

Place the standoff spigot end into the hole on the side opposite the mating face, so that stand-off rests on the hexagon head. 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 misalign.

3 Step 3 Blind Standoff Step 3

Using a punch, apply only sufficient pressure to ‘squeeze’ the hexagon head into the parent sheet.

4 Step 4 Blind Standoff Step 4

The hexagon head if properly installed will provide torsional (rotational) resistance. After installation the head should be flush with the sheet.



Installation animation


Using the table below with reference to the specific size of the Standoff, 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.

To install the fastener into the punched hole a profiled punch of a suitable size is required.

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



Hole sizes - metric (mm)

Thread and pitch M3 0.5 M3alt 0.5 M4 0.7 M5 0.8
Min rec sheet thickness 1.0 1.0 1.3 1.3
Hole size +0.08 -0.00 4.2 5.4 7.2 7.2
Min distance to edge of sheet 6 6.8 8 8


Hole sizes - inches

Thread and pitch No.4 No.6 No.8 No.10
Min rec sheet thickness .040 .040 .050 .050
Hole size +0.08 -0.00 .166 .213 .281 .281
Min distance to edge of sheet .23 .27 .31 .31



Self Clinch Blind Stand off Punch Anvil Diagram Thread size D  mm
M3 4.18
M3 alt 5.39
M4 7.10
M5 7.10
‘L’ = length of standoff