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Bellows couplings (GN 2244 and common sizes): outside diameter, length, clamp screw, rated torque, misalignment
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? · Standard part · basis: Ganter GN 2244 table via Digi-Key; McMaster-Carr bellows coupling sizes as a second list; McMaster-Carr linked for CAD
Also called: 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
Exact dimensions. True size, with no tolerance added.
- sizes
- 11 in table
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.
Bellows couplings (GN 2244 and common sizes): outside diameter… size chart
| 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) | — | — | — | — | — | — | — | — | — | — | — | — |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| 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 |
| 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 |
Xem scan
File coming
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https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=bellows-couplings
Fits with
Questions
What size is a 19 mm bellows coupling?
Outside Ø19, length 30, M2 clamp screw (0.5 Nm), rated torque 1.5 Nm, 33000 rpm (Ganter GN 2244).
What is the rated torque of a Ø32 bellows coupling?
4.5 Nm, 19000 rpm, M3 clamp screw, length 46, lateral misalignment 0.2 mm, axial ±0.7 mm.
How much misalignment does a bellows coupling allow?
In GN 2244: 0.15 to 0.2 mm lateral, ±0.5 to ±1 mm axial, 1.5° angular, depending on size.
Bellows or jaw coupling?
Bellows is torsionally stiff and backlash-free; a jaw coupling damps vibration but is softer. See the jaw coupling page for L-series sizes.