Hole gauges for Ø3, Ø5 and Ø8 (0.1 mm steps) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/hole-gauges/  (CC BY 4.0)
Basis: Holes stepped around the Ø3, Ø5 and Ø8 nominals in 0.1 mm (plus one 0.2 mm) steps; every file on the site is drawn at exact size
Catalog version: 2026-10-20

Sizes: see table below
- Every file on this site is drawn at exact size with no printing allowance; this gauge steps through sizes around the nominal so you can measure the allowance your process needs for one fit class, then apply it only to the features each object lists under Mating features.
- Each gauge is a 118 × 24 × 5 mm plate with eight through holes on 14 mm pitch and the size engraved under each: 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.6; 4.8–5.4 and 5.6; 7.8–8.4 and 8.6.
- Push a true pin or shaft into each hole: the smallest it presses into and stays is your press size, the smallest it slides through by hand your slide size, the smallest it turns freely in your run size.
- Each of those minus the nominal is your allowance for that fit class; for example a Ø3 pin that presses into 3.1 and turns freely in 3.3 gives +0.1 press and +0.3 run.

gauge  sizes_mm  nominal_mm
hole-gauge-m3-2-8-to-3-6  2.8–3.4, 3.6  3
hole-gauge-m5-4-8-to-5-6  4.8–5.4, 5.6  5
hole-gauge-m8-7-8-to-8-6  7.8–8.4, 8.6  8

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Engineering tolerance — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Engineering_tolerance
- Prusa: Knowledge base: XY size compensation — web — Prusa KB [verify license at link] — https://help.prusa3d.com/article/xy-size-compensation_125045
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/hole-gauges/index.json
API: https://xemstudio.com/api/geometry?object=hole-gauges