
Concealed Head Standoffs
Threaded standoffs fitted into a blind hole, hidden from the front.

Unthreaded spacers for a screw that passes right through.
Clear hole standoffs have a plain bore instead of a thread. A screw passes through them to a nut or tapped part beyond, while the standoff sets the spacing.
Full dimensions, preferred lengths and installation / push-out / torque-out performance data are in the tables below, taken from the self-clinching fasteners catalogue.
| Part numbers | SG-SO |
|---|---|
| Zinc Plated Steel | SG-SO |
| Sheet hardness (SG-SO) | HRB 80 or less |
All dimensions in mm unless stated. Values from the self-clinching fasteners catalogue. Install into sheet within the hardness limits shown in the specifications.
| Diameter code | 43.1 | 63.1 | 63.6 | 83.6 | 84.1 | 85.1 |
|---|---|---|---|---|---|---|
| D counterbore diameter ±0.13 | 3.1 | 3.1 | 3.6 | 3.6 | 4.1 | 5.1 |
| C ±0.13 | 4.2 | 5.39 | 5.39 | 7.12 | 7.12 | 7.12 |
| A nom. | 4.8 | 6.4 | 6.4 | 7.9 | 7.9 | 7.9 |
| Min. sheet thickness | 1.0 | 1.0 | 1.0 | 1.27 | 1.27 | 1.27 |
| Recommended hole size +0.08 | 4.22 | 5.41 | 5.41 | 7.14 | 7.14 | 7.14 |
| Min. distance to edge of sheet | 6.0 | 6.8 | 6.8 | 8.0 | 8.0 | 8.0 |
| Length L | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
|---|

Threaded standoffs fitted into a blind hole, hidden from the front.

Closed-end threaded spacers, sealed on one side.

Threaded spacers open at both ends.

Snap-top standoffs: push the board on, no screw needed.

Standoffs with a locking thread that resists screw loosening.

Keyhole-mount standoffs that slide and lock a board in place.