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Threaded standoffs, M2.5 and M3 (hex and round)
What are the dimensions of M3 and M2.5 hex standoffs for mounting a PCB? · Hardware · basis: common vendor dimensions
- sizes
- 2 in table
Notes
- M2.5 (Raspberry Pi) standoffs: 5 mm across flats; M3: 5.5 mm across flats. Lengths 3–40 mm in 1–5 mm steps; male-female adds a 6 mm stud.
- Pocket for a hex standoff in a print: AF + 0.2 mm.
Sizes
| thread | width_af_mm | corner_mm | common_lengths_mm |
|---|---|---|---|
| M2.5 | 5 | 5.8 | 3, 5, 6, 8, 10, 12, 15, 20 |
| M3 | 5.5 | 6.4 | 5, 6, 8, 10, 12, 15, 20, 25, 30 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | Standoffs (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
Free files
★ Free files 16 parts, generated by Xem Studio from the standard. CC BY 4.0. Threads are plain cylinders at major diameter. index.json
| standoff-m2.5x5 | hex standoff M2.5 × 5, female-female | STEP · STL |
| standoff-m2.5x6 | hex standoff M2.5 × 6, female-female | STEP · STL |
| standoff-m2.5x8 | hex standoff M2.5 × 8, female-female | STEP · STL |
| standoff-m2.5x10 | hex standoff M2.5 × 10, female-female | STEP · STL |
| standoff-m2.5x12 | hex standoff M2.5 × 12, female-female | STEP · STL |
| standoff-m2.5x15 | hex standoff M2.5 × 15, female-female | STEP · STL |
| standoff-m2.5x20 | hex standoff M2.5 × 20, female-female | STEP · STL |
| standoff-m3x5 | hex standoff M3 × 5, female-female | STEP · STL |
| standoff-m3x6 | hex standoff M3 × 6, female-female | STEP · STL |
| standoff-m3x8 | hex standoff M3 × 8, female-female | STEP · STL |
| standoff-m3x10 | hex standoff M3 × 10, female-female | STEP · STL |
| standoff-m3x12 | hex standoff M3 × 12, female-female | STEP · STL |
| standoff-m3x15 | hex standoff M3 × 15, female-female | STEP · STL |
| standoff-m3x20 | hex standoff M3 × 20, female-female | STEP · STL |
| standoff-m3x25 | hex standoff M3 × 25, female-female | STEP · STL |
| standoff-m3x30 | hex standoff M3 × 30, female-female | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=threaded-standoffs-metric
Fits with
Questions
What size standoff does a Raspberry Pi use?
M2.5, 5 mm across flats. The Pi 4, Pi 5, Zero 2 W and Pico all mount on M2.5; common heights are 5, 6, 10 and 12 mm.
What is the across-flats size of an M3 hex standoff?
5.5 mm across flats, 6.4 mm across corners. Pocket in a print: 5.7 mm across flats.