Push-fit fitting envelopes: 4 / 6 / 8 mm tube, G1/8 and G1/4 thread stubs — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/push-fit-fittings/  (CC BY 4.0)
Basis: Push-fit (push-to-connect) envelope: socket = PU tube OD, 12 deep; BSPP thread stub at the G major diameter (G1/8 Ø9.73, G1/4 Ø13.16)
Catalog version: 2026-10-20

Sizes: see table below
- Each file is an envelope of a straight push-fit fitting: a Ø(tube OD + 8) × 14 body, a 2 mm collar on top, and an 8 mm thread stub below; 24 mm overall.
- The tube socket is drawn at the PU tube OD exactly (Ø4, Ø6, Ø8) and 12 mm deep, with a through bore of Ø2, Ø4 or Ø6.
- Thread stubs are plain cylinders at the BSPP major diameter: G1/8 Ø9.73, G1/4 Ø13.16; threads are not modelled.
- Sizes: 4 mm tube / G1/8, 6 mm / G1/8, 6 mm / G1/4, 8 mm / G1/4.

file  tube_od_mm  socket_depth_mm  thread  stub_od_mm  overall_mm
pushfit-4mm-g1-8  4  12  G1/8  9.73  24
pushfit-6mm-g1-8  6  12  G1/8  9.73  24
pushfit-6mm-g1-4  6  12  G1/4  13.16  24
pushfit-8mm-g1-4  8  12  G1/4  13.16  24

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Hose barb — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hose_barb
- Wikipedia: Push-fit fitting — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Push-to-connect_fitting
- McMaster-Carr: Tubing (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/tubing/
- 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, 4 parts): https://xemstudio.com/files/hardware/push-fit-fittings/index.json
API: https://xemstudio.com/api/geometry?object=push-fit-fittings