Bellows couplings (GN 2244 and common sizes): outside diameter, length, clamp screw, rated torque, misalignment — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/bellows-couplings/ (sheet CC BY 4.0) Basis: Ganter GN 2244 table via Digi-Key; McMaster-Carr bellows coupling sizes as a second list; McMaster-Carr linked for CAD Catalog version: 2026-10-20 Sizes: see table below - A bellows coupling joins two shafts through a thin-walled metal bellows between two clamp hubs: it is torsionally stiff with no backlash (good for encoders, lead screws and servo/stepper drives) and takes small misalignment, but it is fragile in bending and shock. Hubs clamp with one screw or two; the bore combinations are chosen per order. - Numbers: Ganter GN 2244 (aluminium hubs, stainless bellows) via Digi-Key, four sizes with outside Ø 19, 27, 32 and 40 mm: lengths l1 30 / 35 / 46 / 51, clamp screws M2 / M2.5 / M3 / M4 with tightening torques 0.5 / 0.9 / 1.5 / 3.5 Nm, rated torques 1.5 / 2.3 / 4.5 / 10 Nm, maximum speeds 33000 / 23000 / 19000 / 15000 rpm; lateral misalignment 0.15 / 0.15 / 0.2 / 0.2 mm, axial ±0.5 / ±0.5 / ±0.7 / ±1 mm, angular 1.5°. The l2, l3, l4 letters are the maker's drawing letters and are not interpreted. Standard bore combinations are in the maker's table and are not reproduced here. - McMaster-Carr lists bellows couplings (aluminium and 321 stainless) at outside Ø × length of 15 × 27.3, 19.1 × 33.2, 25.4 × 34.2, 33.3 × 43.2, 41.3 × 51.7, 50.8 × 61.3 and 57.2 × 82.2 mm; they are included as a second, independent size list: for the 19 mm size Ganter's 30 against McMaster's 33.2 for a 19.1 mm part shows that lengths differ between makers, so the two are shown side by side, never merged. - Files: none. The bellows convolutions are not dimensioned in the tables. - Left out: bore lists, torsional stiffness, double-bellows couplings, set-screw hubs, weights. size outside Ø d1, mm length l1, mm l2, mm l3, mm l4, mm clamp screw screw tightening torque, Nm rated torque, Nm max speed, rpm lateral misalignment, mm axial, mm angular GN 2244, d1 19 Ø19 30 10.5 3 6.8 M2 0.5 1.5 33000 0.15 ±0.5 1.5° GN 2244, d1 27 Ø27 35 12.5 3.5 10.3 M2.5 0.9 2.3 23000 0.15 ±0.5 1.5° GN 2244, d1 32 Ø32 46 15.5 4.3 12 M3 1.5 4.5 19000 0.2 ±0.7 1.5° GN 2244, d1 40 Ø40 51 16 5 15 M4 3.5 10 15000 0.2 ±1 1.5° Ø15 × 27.3 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø19.1 × 33.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø25.4 × 34.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø33.3 × 43.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø41.3 × 51.7 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø50.8 × 61.3 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Ø57.2 × 82.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Ganter / Digi-Key data sheet GN 2244: Bellows couplings GN 2244: d1 outside diameter, bore combinations, clamping screw d4, l1 to l4, torque, speed, misalignment — web — Publisher's page; dimensions are facts — https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4017/2244.pdf - McMaster-Carr: Bellows shaft couplings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/bellows-shaft-couplings No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=bellows-couplings