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Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)
What are the head dimensions and clearance holes for M3, M4 and M5 socket head cap screws? · Hardware · basis: ISO 4762 / DIN 912; clearance per ISO 273 medium
- sizes
- 7 in table
Notes
- Head diameter ≈ 1.5 × thread, head height = thread diameter. Counterbore the head diameter + 0.5 mm, depth = head height + 0.5 mm.
- Clearance (medium): M2 2.4, M2.5 2.9, M3 3.4, M4 4.5, M5 5.5, M6 6.6, M8 9.0 mm. Printed holes: add ~0.2–0.3 mm.
- Tap drill: M2 1.6, M2.5 2.05, M3 2.5, M4 3.3, M5 4.2, M6 5.0, M8 6.8 mm.
Sizes
| thread | pitch_mm | head_dia_mm | head_height_mm | hex_key_mm | clearance_mm | tap_drill_mm |
|---|---|---|---|---|---|---|
| M2 | 0.4 | 3.8 | 2 | 1.5 | 2.4 | 1.6 |
| M2.5 | 0.45 | 4.5 | 2.5 | 2 | 2.9 | 2.05 |
| M3 | 0.5 | 5.5 | 3 | 2.5 | 3.4 | 2.5 |
| M4 | 0.7 | 7 | 4 | 3 | 4.5 | 3.3 |
| M5 | 0.8 | 8.5 | 5 | 4 | 5.5 | 4.2 |
| M6 | 1.0 | 10 | 6 | 5 | 6.6 | 5.0 |
| M8 | 1.25 | 13 | 8 | 6 | 9.0 | 6.8 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | Socket head screws (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 |
| Wikipedia | List of screw drives / ISO metric screw thread | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 47 parts, generated by Xem Studio from the standard. CC BY 4.0. Threads are plain cylinders at major diameter. index.json
| shcs-m2x4 | ISO 4762 M2 × 4, thread as plain cylinder | STEP · STL |
| shcs-m2x6 | ISO 4762 M2 × 6, thread as plain cylinder | STEP · STL |
| shcs-m2x8 | ISO 4762 M2 × 8, thread as plain cylinder | STEP · STL |
| shcs-m2x10 | ISO 4762 M2 × 10, thread as plain cylinder | STEP · STL |
| shcs-m2x12 | ISO 4762 M2 × 12, thread as plain cylinder | STEP · STL |
| shcs-m2.5x5 | ISO 4762 M2.5 × 5, thread as plain cylinder | STEP · STL |
| shcs-m2.5x6 | ISO 4762 M2.5 × 6, thread as plain cylinder | STEP · STL |
| shcs-m2.5x8 | ISO 4762 M2.5 × 8, thread as plain cylinder | STEP · STL |
| shcs-m2.5x10 | ISO 4762 M2.5 × 10, thread as plain cylinder | STEP · STL |
| shcs-m2.5x12 | ISO 4762 M2.5 × 12, thread as plain cylinder | STEP · STL |
| shcs-m2.5x16 | ISO 4762 M2.5 × 16, thread as plain cylinder | STEP · STL |
| shcs-m3x6 | ISO 4762 M3 × 6, thread as plain cylinder | STEP · STL |
| shcs-m3x8 | ISO 4762 M3 × 8, thread as plain cylinder | STEP · STL |
| shcs-m3x10 | ISO 4762 M3 × 10, thread as plain cylinder | STEP · STL |
| shcs-m3x12 | ISO 4762 M3 × 12, thread as plain cylinder | STEP · STL |
| shcs-m3x16 | ISO 4762 M3 × 16, thread as plain cylinder | STEP · STL |
| shcs-m3x20 | ISO 4762 M3 × 20, thread as plain cylinder | STEP · STL |
| shcs-m3x25 | ISO 4762 M3 × 25, thread as plain cylinder | STEP · STL |
| shcs-m3x30 | ISO 4762 M3 × 30, thread as plain cylinder | STEP · STL |
| shcs-m4x8 | ISO 4762 M4 × 8, thread as plain cylinder | STEP · STL |
| shcs-m4x10 | ISO 4762 M4 × 10, thread as plain cylinder | STEP · STL |
| shcs-m4x12 | ISO 4762 M4 × 12, thread as plain cylinder | STEP · STL |
| shcs-m4x16 | ISO 4762 M4 × 16, thread as plain cylinder | STEP · STL |
| shcs-m4x20 | ISO 4762 M4 × 20, thread as plain cylinder | STEP · STL |
| shcs-m4x25 | ISO 4762 M4 × 25, thread as plain cylinder | STEP · STL |
| shcs-m4x30 | ISO 4762 M4 × 30, thread as plain cylinder | STEP · STL |
| shcs-m4x40 | ISO 4762 M4 × 40, thread as plain cylinder | STEP · STL |
| shcs-m5x10 | ISO 4762 M5 × 10, thread as plain cylinder | STEP · STL |
| shcs-m5x12 | ISO 4762 M5 × 12, thread as plain cylinder | STEP · STL |
| shcs-m5x16 | ISO 4762 M5 × 16, thread as plain cylinder | STEP · STL |
| shcs-m5x20 | ISO 4762 M5 × 20, thread as plain cylinder | STEP · STL |
| shcs-m5x25 | ISO 4762 M5 × 25, thread as plain cylinder | STEP · STL |
| shcs-m5x30 | ISO 4762 M5 × 30, thread as plain cylinder | STEP · STL |
| shcs-m5x40 | ISO 4762 M5 × 40, thread as plain cylinder | STEP · STL |
| shcs-m6x12 | ISO 4762 M6 × 12, thread as plain cylinder | STEP · STL |
| shcs-m6x16 | ISO 4762 M6 × 16, thread as plain cylinder | STEP · STL |
| shcs-m6x20 | ISO 4762 M6 × 20, thread as plain cylinder | STEP · STL |
| shcs-m6x25 | ISO 4762 M6 × 25, thread as plain cylinder | STEP · STL |
| shcs-m6x30 | ISO 4762 M6 × 30, thread as plain cylinder | STEP · STL |
| shcs-m6x40 | ISO 4762 M6 × 40, thread as plain cylinder | STEP · STL |
| shcs-m6x50 | ISO 4762 M6 × 50, thread as plain cylinder | STEP · STL |
| shcs-m8x16 | ISO 4762 M8 × 16, thread as plain cylinder | STEP · STL |
| shcs-m8x20 | ISO 4762 M8 × 20, thread as plain cylinder | STEP · STL |
| shcs-m8x25 | ISO 4762 M8 × 25, thread as plain cylinder | STEP · STL |
| shcs-m8x30 | ISO 4762 M8 × 30, thread as plain cylinder | STEP · STL |
| shcs-m8x40 | ISO 4762 M8 × 40, thread as plain cylinder | STEP · STL |
| shcs-m8x50 | ISO 4762 M8 × 50, thread as plain cylinder | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=socket-head-cap-screws-metric
Fits with
Questions
What size hole for an M3 screw?
Clearance 3.4 mm (medium fit, ISO 273); in a 3D print use 3.6–3.7 mm. Tap drill for cutting an M3 thread: 2.5 mm.
How big is an M3 socket head cap screw head?
Head diameter 5.5 mm, head height 3 mm, 2.5 mm hex key (ISO 4762). Counterbore 6.0 mm diameter, 3.5 mm deep.
M4 and M5 clearance and tap drill sizes?
M4: clearance 4.5 mm, tap drill 3.3 mm, head Ø7 × 4 tall, 3 mm key. M5: clearance 5.5 mm, tap drill 4.2 mm, head Ø8.5 × 5 tall, 4 mm key.