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Tri-clamp (Tri-Clover) sanitary ferrule, 1/2 to 4 inch

What are tri-clamp ferrule dimensions: flange OD, tube OD and which sizes share a clamp? · Hardware · basis: ISO 2852:1974 face profile (rim 2.85, recess 1.6, 20° back angle, groove diameters) with ASME BPE tube sizes; 16 ga wall

sizes
8 in table

Notes

  • Clamp size follows the flange OD, not the tube: 1/2 and 3/4 in share a 25.4 mm flange; 1 and 1.5 in share 50.5 mm; 2 in is 64.0; 2.5 in 77.5; 3 in 91.0; 4 in 119.0 mm.
  • Face (ISO 2852 §6.1): a flat sealing land from the groove diameter C2 out to the rim, and a recess 1.6 mm deep (K) from C2 in to the bore, where the gasket bead sits. C2 = 43.5 mm for the 50.5 flange, 56.5 for 64.0, 83.5 for 91.0. Radii R2 2.0 / R3 1.2 mm.
  • Rim thickness L1 = 2.85 mm; the back of the flange is a 20° cone (α) rising to the hub, which is what the clamp's V-ring grips. Hub thickness works out to about 5.3 mm on a 2 in weld ferrule.
  • Weld ferrules: 21.5 mm (ISO/short) or 28.6 mm (ASME BPE medium); 44.5 / 57.2 mm long versions exist. Tube end plain for a butt weld.
  • Printing it: this profile prints true in PLA/PETG for mock-ups and clamp fit checks; the sealing land needs a smooth top layer. Real parts are 304/316 stainless.
  • Why it matters here: a thermoacoustic/Stirling engine body built from 2 in tri-clamp parts is a stack of ferrules, spools and caps; print the stack first, then buy steel.

Sizes

nominal_intube_od_mmtube_od_inwall_mmflange_od_mmgroove_dia_mmclamp_size
1/212.70.51.6525.4n/a in ISO sample1/2–3/4
3/419.050.751.6525.4n/a in ISO sample1/2–3/4
125.41.01.6550.543.51–1.5
1-1/238.11.51.6550.543.51–1.5
250.82.01.6564.056.52
2-1/263.52.51.6577.5n/a in ISO sample2.5
376.23.01.6591.083.53
4101.64.02.11119.0n/a in ISO sample4

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

ISO (via iTeh sample)ISO 2852:1974 clamp liners with gaskets (face and gasket profile, §6.1 and §8)PDFstandard excerpt; dimensions are facts
McMaster-CarrSanitary (quick-clamp) tube fittings (free STEP per part, for your own design use; no redistribution)STEP, PDFMcMaster-Carr site terms: personal design use, no redistribution verify
Dixon ValveSanitary fittings catalog (dimensions)PDFvendor catalog verify
WikipediaTri-clamp fittingwebCC BY-SA 4.0 (text) verify
Long Earth SocietyThe engine built from tri-clamp partswebCC BY 4.0 (text)

Free files

★ Free files 8 parts, generated by Xem Studio from the standard. CC BY 4.0. Threads are plain cylinders at major diameter. index.json

tc-ferrule-1in-21.5mm1 in weld ferrule, 21.5 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-1in-28.6mm1 in weld ferrule, 28.6 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-1.5in-21.5mm1.5 in weld ferrule, 21.5 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-1.5in-28.6mm1.5 in weld ferrule, 28.6 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-2in-21.5mm2 in weld ferrule, 21.5 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-2in-28.6mm2 in weld ferrule, 28.6 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-3in-21.5mm3 in weld ferrule, 21.5 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL
tc-ferrule-3in-28.6mm3 in weld ferrule, 28.6 mm, 16 ga; ISO 2852 face (2.85 rim, 1.6 recess, 20° back)STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-ferrule

Tri-clamp (Tri-Clover) sanitary ferrule, 1/2 to 4 inch, isometric render of a generated part
Render of tc-ferrule-2in-21.5mm from the free STEP; not to scale.

Fits with

Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch, isometric render of a generated part
Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch7 sizes★ 7 files
Tri-clamp end cap and gasket, 1.5 and 2 inch, isometric render of a generated part
Tri-clamp end cap and gasket, 1.5 and 2 inch2 sizes★ 4 files
Schedule 40 pipe and PVC fittings, 1/2 to 2 inch, isometric render of a generated part
Schedule 40 pipe and PVC fittings, 1/2 to 2 inch6 sizes★ 6 files
CS
O-rings, common metric sizes (ISO 3601)7 sizes★ free

Questions

What is the flange OD of a 2 inch tri clamp ferrule?

64.0 mm. 1 in and 1.5 in share a 50.5 mm flange and the same clamp; 2.5 in is 77.5 mm; 3 in is 91.0 mm; 4 in is 119.0 mm.

Are 1 inch and 1.5 inch tri clamp fittings interchangeable?

The flanges are the same (50.5 mm OD, 43.5 mm groove) so a 1.5 in clamp and gasket fit both; the tube bores differ (25.4 vs 38.1 mm OD tube).

What are the ISO 2852 tri clamp face dimensions?

Rim thickness 2.85 mm, gasket recess 1.6 mm deep inside the groove diameter (43.5 / 56.5 / 83.5 mm for 50.5 / 64 / 91 flanges), 20° back cone that the clamp grips. The free STEP files here use exactly that profile.

Can I 3D print a tri clamp ferrule?

For mock-ups, fit checks and low-pressure air, yes: the STEP/STL here follow the ISO 2852 face so a real clamp and gasket seat on them. Not for pressure, heat or food service; print the stack, then buy stainless.