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Hose barbs for 2, 3, 4, 6 and 8 mm ID tube
What barb size for 4 mm ID silicone tube? · Hardware · basis: Barb geometry rule: shank Ø = tube ID, three 2.5 mm ramps to tube ID + 1.2 (the designed stretch), hex base AF = ID + 6
Long Earth Society build part. Transfer ports between hot and cold spools on the LES demonstrators. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 5 in table
Notes
- Each barb has a 14 mm shank at the tube ID, three ridges (at 2, 6 and 10 mm from the tip) that ramp over 2.5 mm from the ID to ID + 1.2, and a 4 mm hex base; overall 18 mm.
- Sizes: 2 mm (ridges Ø3.2, Ø1 bore, 8 AF), 3 mm (Ø4.2, Ø1.5, 9 AF), 4 mm (Ø5.2, Ø2.5, 10 AF), 6 mm (Ø7.2, Ø4.5, 12 AF), 8 mm (Ø9.2, Ø6.5, 14 AF).
- The +1.2 on the ridges is the designed stretch of the tube; the shank is the tube ID, exact.
- The can-engine cap's transfer port is an integral Ø4 barb with the same profile as barb-4mm.
Sizes
| barb | shank_mm | ridge_mm | bore_mm | hex_af_mm |
|---|---|---|---|---|
| barb-2mm | 2 | 3.2 | 1 | 8 |
| barb-3mm | 3 | 4.2 | 1.5 | 9 |
| barb-4mm | 4 | 5.2 | 2.5 | 10 |
| barb-6mm | 6 | 7.2 | 4.5 | 12 |
| barb-8mm | 8 | 9.2 | 6.5 | 14 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| barb shank | Ø = tube ID (2 / 3 / 4 / 6 / 8) | silicone tube ID | designed | barb-* |
| barb ridges | tube ID + 1.2 | silicone tube (stretched) | designed | barb-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Hose barb | web | CC BY-SA 4.0 (text) |
| Wikipedia | Push-fit fitting | web | CC BY-SA 4.0 (text) |
| McMaster-Carr | Tubing (free STEP per part, for your own design use; no redistribution) | STEP, PDF | McMaster-Carr site terms verify |
| Long Earth Society | Engine and rig builds | web, video | LES site |
Free files
★ Free files 5 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| barb-2mm | hose barb for 2 mm ID tube: Ø2 shank, three barbs to Ø3.2, Ø1 bore, 8 AF hex base | STEP · STL |
| barb-3mm | hose barb for 3 mm ID tube: Ø3 shank, three barbs to Ø4.2, Ø1.5 bore, 9 AF hex base | STEP · STL |
| barb-4mm | hose barb for 4 mm ID tube: Ø4 shank, three barbs to Ø5.2, Ø2.5 bore, 10 AF hex base | STEP · STL |
| barb-6mm | hose barb for 6 mm ID tube: Ø6 shank, three barbs to Ø7.2, Ø4.5 bore, 12 AF hex base | STEP · STL |
| barb-8mm | hose barb for 8 mm ID tube: Ø8 shank, three barbs to Ø9.2, Ø6.5 bore, 14 AF hex base | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=hose-barbs
How it fits
Goes in or on
Can-engine cap for 53.3, 58, 66 and 76.2 mm cansthe cap's integral Ø4 barb uses this profileConnects to
Silicone tube 1 × 3 to 10 × 14 mmtube ID over the shank, stretched over the ID + 1.2 ridgesAlternatives
Push-fit fitting envelopesfor stiff PU tubeAlso needed
Zip tie 4.8 × 1.3 mm cross-sectionclamp over the tube on the barbQuestions
What barb size for 6 mm ID silicone tube?
A Ø6 shank with ridges to Ø7.2 (ID + 1.2), three ridges 2.5 mm long; that is barb-6mm.
How long is the barb?
18 mm overall: a 14 mm barbed shank plus a 4 mm hex base.
What is the bore of the 4 mm barb?
Ø2.5 through, with ridges to Ø5.2 and a 10 mm AF hex.