Printable tri-clamp (45°): caps with PG13.5 probe ports (12 mm pH, dissolved O₂ and CO₂ probes): 1½ to 4 in — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/printable-tri-clamp-pg13-5-probe-ports/ (CC BY 4.0) Basis: Xem Studio design: Xem Studio design on the standard solid cap: PG13.5 (DIN 40430: Ø20.4 major, 1.41 pitch, Ø18.6 core) in a Ø30 boss, drawn as the core bore over 12 mm of thread, Ø12.5 through for the 12 mm probe shaft; printable 45° back cone Catalog version: 2026-10-20 Sizes: see table below - 3D-printable tri-clamp: this is Xem Studio's print-friendly version of the standard sanitary fitting, drawn so it prints on an ordinary FDM or resin printer with no supports. Download the STL to print it, or the STEP to edit it. The files are true size (no printing allowance): add your own clearance in the slicer or CAD if your printer needs it. - Most process probes (pH, ORP, dissolved oxygen, dissolved CO₂, conductivity) are 12 mm shafts with a PG13.5 thread on the head: they screw straight into this port and seal on their own O-ring. - Probe length sets how deep the tip reaches below the clamp face; pick the probe so its tip sits in the liquid at your lowest fill. - Printable tri-clamp: the ISO 2852 face and gasket groove are exactly standard, only the back cone behind each rim is 45° instead of 20°, so no rim overhangs more than 45° from vertical in any print orientation. Join these with the 45° clamps (printable-tri-clamp-clamps) and standard Type B gaskets; a 45° clamp fits only 45° rims, so keep a run all 45°. A 45° cone turns clamp force into face force at 1 : 1 (a 20° cone at 2.7 : 1), so tighten the clamp bolts harder or use M6. - Print orientation: straight parts face down; elbows, tees and crosses with one face down; horizontal bores bridge their top, so keep them small or add a light tree support inside. - Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40. clamp ports pg_major_mm core_mm probe_mm 1–1½ 1 20.4 18.6 12.0 2 1 20.4 18.6 12.0 3 2 20.4 18.6 12.0 3 3 20.4 18.6 12.0 4 3 20.4 18.6 12.0 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - DIN: DIN 40430 Pg (Panzergewinde) threads: PG13.5 Ø20.4 major, 1.41 pitch (18 tpi), Ø18.6 core; the thread of 12 mm process probes (pH, dissolved O2 / CO2) — standard — DIN; dimensions are facts [verify license at link] — https://www.din.de/en - GW Kent: Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness — web — publisher's guide; dimensions cited — https://www.gwkent.com/triclamp-guide - Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/printable-tri-clamp-pg13-5-probe-ports/index.json API: https://xemstudio.com/api/geometry?object=printable-tri-clamp-pg13-5-probe-ports