{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "bellows-couplings", "name": "Bellows couplings (GN 2244 and common sizes): outside diameter, length, clamp screw, rated torque, misalignment", "kind": "standard", "category": "Hardware", "group": "Bearings, rails & motion", "year": null, "question": "What are the sizes of a bellows shaft coupling (19 mm, 25 mm, 27 mm, 32 mm, 40 mm): outside diameter, length, clamp screw, rated torque and misalignment?", "tags": [ "bellows coupling", "shaft coupling", "stepper", "encoder", "gn 2244", "servo", "lead screw coupler" ], "aliases": [ "bellows coupling dimensions", "bellows coupling 19mm", "bellows coupling 25mm", "bellows coupling 27mm", "bellows coupling 32mm", "bellows coupling 40mm", "bellows coupling torque", "gn 2244 bellows coupling", "bellows coupler 5mm 8mm", "bellows coupling misalignment", "bellows coupling cad", "servo coupling dimensions" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "not-scanned", "les": false, "free_files": 0, "url": "https://xemstudio.com/objects/bellows-couplings/", "sheet_txt": "https://xemstudio.com/objects/bellows-couplings/sheet.txt", "sheet": { "basis": "Ganter GN 2244 table via Digi-Key; McMaster-Carr bellows coupling sizes as a second list; McMaster-Carr linked for CAD", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "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." ], "table": { "columns": [ "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" ], "rows": [ [ "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)", "—", "—", "—", "—", "—", "—", "—", "—", "—", "—", "—", "—" ] ] } }, "sheet_text": "Bellows couplings (GN 2244 and common sizes): outside diameter, length, clamp screw, rated torque, misalignment — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bellows-couplings/ (sheet CC BY 4.0)\nBasis: Ganter GN 2244 table via Digi-Key; McMaster-Carr bellows coupling sizes as a second list; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n- Files: none. The bellows convolutions are not dimensioned in the tables.\n- Left out: bore lists, torsional stiffness, double-bellows couplings, set-screw hubs, weights.\n\nsize 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\nGN 2244, d1 19 Ø19 30 10.5 3 6.8 M2 0.5 1.5 33000 0.15 ±0.5 1.5°\nGN 2244, d1 27 Ø27 35 12.5 3.5 10.3 M2.5 0.9 2.3 23000 0.15 ±0.5 1.5°\nGN 2244, d1 32 Ø32 46 15.5 4.3 12 M3 1.5 4.5 19000 0.2 ±0.7 1.5°\nGN 2244, d1 40 Ø40 51 16 5 15 M4 3.5 10 15000 0.2 ±1 1.5°\nØ15 × 27.3 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ19.1 × 33.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ25.4 × 34.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ33.3 × 43.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ41.3 × 51.7 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ50.8 × 61.3 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\nØ57.2 × 82.2 (McMaster-listed aluminium / 321 SS bellows coupling, outside Ø × length) — — — — — — — — — — — —\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- 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\n- 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\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=bellows-couplings\n", "sources": [ { "publisher": "Ganter / Digi-Key data sheet GN 2244", "title": "Bellows couplings GN 2244: d1 outside diameter, bore combinations, clamping screw d4, l1 to l4, torque, speed, misalignment", "url": "https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4017/2244.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Bellows shaft couplings (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/bellows-shaft-couplings", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false } ], "xem": { "status": "not-scanned", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "shaft-couplers", "jaw-spider-couplings-l-series", "nema-23-stepper", "t8-lead-screw", "ball-screw-end-supports-bk-bf-fk-ff", "linear-shafts-h6" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [], "faq": [ { "q": "What size is a 19 mm bellows coupling?", "a": "Outside Ø19, length 30, M2 clamp screw (0.5 Nm), rated torque 1.5 Nm, 33000 rpm (Ganter GN 2244)." }, { "q": "What is the rated torque of a Ø32 bellows coupling?", "a": "4.5 Nm, 19000 rpm, M3 clamp screw, length 46, lateral misalignment 0.2 mm, axial ±0.7 mm." }, { "q": "How much misalignment does a bellows coupling allow?", "a": "In GN 2244: 0.15 to 0.2 mm lateral, ±0.5 to ±1 mm axial, 1.5° angular, depending on size." }, { "q": "Bellows or jaw coupling?", "a": "Bellows is torsionally stiff and backlash-free; a jaw coupling damps vibration but is softer. See the jaw coupling page for L-series sizes." } ], "files_license": null, "offers": [], "markdown": "https://xemstudio.com/objects/bellows-couplings/index.md" }