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

Standoffs designed for very thin sheet metal.
Thin sheet standoffs give a threaded spacer in sheet thinner than a standard standoff allows.
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-TSO, SG-TSOS |
|---|---|
| Zinc Plated Steel | SG-TSO |
| Stainless Steel | SG-TSOS |
| Sizes | M2.5, M3, M3.5 |
| Sheet hardness (SG-TSO) | HRB 60 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.
| Thread | M2.5 | M2.5 alt | M3 | M3 alt | M3.5 |
|---|---|---|---|---|---|
| C -0.13 | 4.2 | 5.39 | 4.2 | 5.39 | 5.39 |
| D ±0.25 | 4.8 | 6.4 | 4.8 | 6.4 | 6.4 |
| Min. sheet thickness | 0.63 | ||||
| Recommended hole size +0.08 | 4.22 - 4.30 | 5.41 - 5.49 | 4.22 - 4.30 | 5.41 - 5.49 | 5.41 - 5.49 |
| Min. distance to edge of sheet | 5.8 | 7.1 | 5.8 | 7.1 | 7.1 |
| Length L | M2.5 | M2.5 alt | M3 | M3 alt | M3.5 |
|---|---|---|---|---|---|
| 2 | • | ||||
| 3 | • | • | |||
| 4 | • | • | |||
| 6 | • | • | • | ||
| 8 | • | • | • | ||
| 10 | Blind | • | • | ||
| 12 | Blind | ||||
| 14 | Blind | Blind |
"Blind" = available as a blind (closed) standoff in that length.

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.

Unthreaded spacers for a screw that passes right through.

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

Standoffs with a locking thread that resists screw loosening.