3D printable bolts and nuts, M10 to M30: hex bolts in short, medium and long lengths, nuts and thread cutters (STL, STEP) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/3d-printable-bolts-and-nuts-metric/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: ISO 68-1 basic thread profile; ISO 261 coarse pitches; ISO 4017 hex head sizes; ISO 4032 nut sizes. Printing clearance 0.3 mm per side on internal threads is Xem's FDM default.
Catalog version: 2026-10-20

Sizes: see table below
- Six sizes, M10 to M30. Printed threads need size to be strong: M10 is about the smallest that prints and holds well in PLA or PETG; use M16 and up for clamping force.
- Every bolt has three lengths (short, medium, long). The thread runs the full length under the head, right to the tip.
- Bolts are exact nominal ISO size, so they also fit a real metal nut or a tapped hole. Nuts and thread cutters are opened 0.3 mm per side so printed parts turn freely.
- Thread cutter: subtract it from your own model (box, lid, clamp, bracket) to get a threaded hole that fits the printable bolt. It is 2 × d long; move or stack it to cover your hole.
- Print bolts standing on the head, 0.2 mm layers or finer, 4 or more walls and 40 % or more infill. Print nuts flat. PETG or nylon take more torque than PLA.

size  pitch mm  minor dia mm  hex across flats mm  head height mm  nut height mm  bolt lengths mm  cutter length mm
M10  1.5  8.376  16  6.4  8.4  20, 30, 50  20
M12  1.75  10.106  18  7.5  10.8  25, 40, 60  24
M16  2.0  13.835  24  10.0  14.8  30, 50, 80  32
M20  2.5  17.294  30  12.5  18.0  40, 60, 100  40
M24  3.0  20.753  36  15.0  21.5  50, 80, 120  48
M30  3.5  26.211  46  18.7  25.6  60, 100, 150  60

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ISO: ISO 68-1:2023 Metric screw threads, basic and design profiles — web — Publisher's page; dimensions are facts — https://www.iso.org/standard/85107.html
- ISO: ISO 261:1998 General purpose metric screw threads, general plan (pitches) — web — Publisher's page; dimensions are facts — https://www.iso.org/standard/4165.html
- ISO: ISO 4032:2023 Hexagon regular nuts (style 1) — web — Publisher's page; dimensions are facts — https://www.iso.org/standard/75016.html
- ISO: ISO 4017 Hexagon head screws (head sizes) — web — Publisher's page; dimensions are facts — https://www.iso.org/standard/55969.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 30 parts): https://xemstudio.com/files/hardware/3d-printable-bolts-and-nuts-metric/index.json
API: https://xemstudio.com/api/geometry?object=3d-printable-bolts-and-nuts-metric