Heat-set threaded inserts, M2–M6 (for 3D prints) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/heat-set-inserts/  (CC BY 4.0)
Basis: vendor data (CNC Kitchen, ruthex, McMaster tapered inserts); typical values
Catalog version: 2026-10-20

Sizes: see table below
- Hole diameter is set by the insert's knurl OD, not the thread; print the hole as listed and give 1 mm of extra depth under the insert for displaced plastic.
- Boss wall: at least 2 mm around the insert; 3 mm for M5+.
- Values differ slightly by brand; the table is the common 'short' size for each thread.

thread  insert_od_mm  insert_length_mm  print_hole_mm  min_depth_mm
M2  3.2  4  3.0  5
M2.5  3.5  4  3.3  5
M3  4.0  5.7  4.0  6.7
M4  5.6  8.1  5.6  9.1
M5  6.4  9.5  6.4  10.5
M6  8.0  12.7  8.0  13.7

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- McMaster-Carr: Heat-set inserts for plastic (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 license at link] — https://www.mcmaster.com/products/heat-set-inserts/
- CNC Kitchen: Threaded inserts, hole size recommendations — web — vendor page [verify license at link] — https://cnckitchen.store/products/heat-set-insert-m3-x-5-7-100-pieces

Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/heat-set-inserts/index.json
API: https://xemstudio.com/api/geometry?object=heat-set-inserts