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Heat-set threaded inserts, inch: #2-56 to 3/8-16 and G1/8 (CNC Kitchen sizes)
What hole size does a 1/4-20 heat-set insert need? · Standard part · basis: CNC Kitchen dimension poster (L, insert Ø D1, hole Ø D2, min wall W, blind hole ≥ L + 1); geometry drawn by Xem Studio from those numbers
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 14 in table
Notes
- Drawn as: lead-in pilot at the tip Ø over the bottom 15 % of the length, two knurl bands at the insert Ø with a relief groove between, thread as a plain bore at the minor diameter (threads not modelled). Knurl texture is not drawn: the insert Ø is the knurl's outside.
- Print the hole at the listed hole Ø, at least the insert length + 1 mm deep for a blind hole (room for displaced plastic), and keep at least W of wall around it. Press the insert in with a soldering iron and insert tip at the plastic's printing temperature until its top is flush.
Sizes
| thread | variant | length_mm | insert_od_mm | hole_mm | min_hole_depth_mm | min_wall_mm | min_boss_od_mm |
|---|---|---|---|---|---|---|---|
| #2-56 | standard | 3.2 | 3.6 | 3.2 | 4.2 | 1.3 | 5.8 |
| #4-40 | standard | 5.7 | 4.6 | 4.0 | 6.7 | 1.6 | 7.2 |
| #4-40 | short | 3.6 | 4.6 | 4.0 | 4.6 | 1.6 | 7.2 |
| #6-32 | standard | 7.1 | 5.4 | 4.8 | 8.1 | 1.8 | 8.4 |
| #6-32 | short | 3.8 | 5.4 | 4.8 | 4.8 | 1.8 | 8.4 |
| #8-32 | standard | 8.2 | 6.3 | 5.7 | 9.2 | 2.1 | 9.9 |
| #8-32 | short | 4.7 | 6.3 | 5.7 | 5.7 | 2.1 | 9.9 |
| #10-24 | standard | 9.5 | 7.1 | 6.5 | 10.5 | 2.6 | 11.7 |
| #10-32 | standard | 9.5 | 7.1 | 6.5 | 10.5 | 2.6 | 11.7 |
| 1/4-20 | standard | 12.7 | 8.7 | 8.1 | 13.7 | 3.3 | 14.7 |
| 1/4-20 | short | 6.4 | 8.7 | 8.1 | 7.4 | 3.3 | 14.7 |
| 5/16-18 | standard | 12.7 | 10.2 | 9.7 | 13.7 | 4.5 | 18.7 |
| 3/8-16 | standard | 12.7 | 12.5 | 12.0 | 13.7 | 6.0 | 24.0 |
| G1/8 | standard | 12.7 | 12.5 | 12.0 | 13.7 | 6.0 | 24.0 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| CNC Kitchen | Threaded insert dimensions and design guidelines poster: L, D1 (insert Ø), D2 (hole Ø), W (min wall); blind hole min. L + 1 mm | maker's sheet; dimensions cited, nothing copied |
Free files
★ Free files 14 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| insert-2-56x3.2-standard | #2-56 × 3.2 standard insert: Ø3.6 knurl, 3.2 long; print hole Ø3.2 × ≥4.2, wall ≥ 1.3 | STEP · STL |
| insert-4-40x5.7-standard | #4-40 × 5.7 standard insert: Ø4.6 knurl, 5.7 long; print hole Ø4 × ≥6.7, wall ≥ 1.6 | STEP · STL |
| insert-4-40x3.6-short | #4-40 × 3.6 short insert: Ø4.6 knurl, 3.6 long; print hole Ø4 × ≥4.6, wall ≥ 1.6 | STEP · STL |
| insert-6-32x7.1-standard | #6-32 × 7.1 standard insert: Ø5.4 knurl, 7.1 long; print hole Ø4.8 × ≥8.1, wall ≥ 1.8 | STEP · STL |
| insert-6-32x3.8-short | #6-32 × 3.8 short insert: Ø5.4 knurl, 3.8 long; print hole Ø4.8 × ≥4.8, wall ≥ 1.8 | STEP · STL |
| insert-8-32x8.2-standard | #8-32 × 8.2 standard insert: Ø6.3 knurl, 8.2 long; print hole Ø5.7 × ≥9.2, wall ≥ 2.1 | STEP · STL |
| insert-8-32x4.7-short | #8-32 × 4.7 short insert: Ø6.3 knurl, 4.7 long; print hole Ø5.7 × ≥5.7, wall ≥ 2.1 | STEP · STL |
| insert-10-24x9.5-standard | #10-24 × 9.5 standard insert: Ø7.1 knurl, 9.5 long; print hole Ø6.5 × ≥10.5, wall ≥ 2.6 | STEP · STL |
| insert-10-32x9.5-standard | #10-32 × 9.5 standard insert: Ø7.1 knurl, 9.5 long; print hole Ø6.5 × ≥10.5, wall ≥ 2.6 | STEP · STL |
| insert-1-4-20x12.7-standard | 1/4-20 × 12.7 standard insert: Ø8.7 knurl, 12.7 long; print hole Ø8.1 × ≥13.7, wall ≥ 3.3 | STEP · STL |
| insert-1-4-20x6.4-short | 1/4-20 × 6.4 short insert: Ø8.7 knurl, 6.4 long; print hole Ø8.1 × ≥7.4, wall ≥ 3.3 | STEP · STL |
| insert-5-16-18x12.7-standard | 5/16-18 × 12.7 standard insert: Ø10.2 knurl, 12.7 long; print hole Ø9.7 × ≥13.7, wall ≥ 4.5 | STEP · STL |
| insert-3-8-16x12.7-standard | 3/8-16 × 12.7 standard insert: Ø12.5 knurl, 12.7 long; print hole Ø12 × ≥13.7, wall ≥ 6 | STEP · STL |
| insert-g1-8x12.7-standard | G1/8 × 12.7 standard insert: Ø12.5 knurl, 12.7 long; print hole Ø12 × ≥13.7, wall ≥ 6 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=heat-set-inserts-inch
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Questions
What hole for a 1/4-20 × 12.7 insert?
Ø8.1, at least 13.7 deep, 3.3 wall (boss Ø14.7 or more).
Short or standard?
Standard holds more; short fits thin walls. Both take the same hole Ø.