Xem Studiomeasured geometryLibrary › Hardware › Bearings, rails & motion ·
Rigid shaft couplings (Ruland MCLC, MSCX, MSCC clamp and set-screw style): bore, OD and length, 6 to 50 mm bore
What are the OD and length of a rigid clamp or set-screw shaft coupling for a given bore, such as 8, 10, 12, 16, 20 or 25 mm? · Standard part · basis: Ruland metric dimension tables (MCLC, MSCX, MSCC) and Ruland / RS datasheets for MCLX-3-3-A, MSCX-6-6-F, MCLX-25-20-F; maker CAD not linked
Also called: rigid coupling dimensions, rigid shaft coupling 8mm, rigid coupling 10mm, rigid coupling 12mm, rigid coupling 16mm, rigid coupling 20mm, rigid coupling 25mm, ruland mclc, ruland mscx, ruland mclx, mclc-10-10, mscx-8-8, one piece clamp coupling, set screw shaft coupler od length, rigid coupling od 29mm, shaft coupler 6mm to 8mm
Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features
- sizes
- 18 in table
Notes
- A rigid shaft coupling joins two shafts of the same or similar size with no flex, so the shafts must already be aligned. The one-piece clamp style (Ruland MCLC / MCLX, 'clamp-style') closes a slit on the shaft with clamp screws; the set-screw style (MSCX / MSCC) locks with set screws, often on the keyway flat. Sizes are named by bore: MCLC-12-12 is a 12 mm bore on both ends.
- Table: the OD and length in Ruland's metric tables are identical across MCLC (clamp, keyway), MSCX (set screw) and MSCC (set screw, keyway) for every bore they share (8, 10, 12, 14, 16, 20, 25, 30, 35, 40, 50 mm; MSCX also 6 mm; MCLC also 15 mm). The 15 mm bore is from the MCLC table only. Black-oxide steel (F) and 303 stainless steel (SS) versions have the same OD and length. Rated speed is 4,000 rpm in the MCLC table.
- Screws: MSCX-6 uses 4 set screws M4 (2 mm hex wrench), shaft penetration 15 mm per side, seating torque 2.2 Nm. MCLX-3-3-A uses 4 forged clamp screws M2 (1.5 mm wrench), shaft penetration 11 mm, seating torque 0.6 Nm. MCLX-25-20-F uses 4 clamp screws M6 (5 mm wrench). The other sizes' screw sizes were not read, so none are invented here.
- Bore tolerance (Ruland datasheet, MCLX-3-3-A): +0.050 / +0.012 mm; recommended shaft: +0.000 / −0.013 mm. Other sizes' tolerances were not read.
- No STEP/STL: the screw positions, clamp slit and keyway shapes are not published as numbers in the sources read, so no honest model beyond a plain tube exists. Left out: two-piece clamp couplings, inch bores (the MCLX inch series and the 'inch to metric' pages exist but were not read), torque ratings, moment of inertia.
Rigid shaft couplings (Ruland MCLC, MSCX, MSCC clamp and set-screw… size chart
| bore, mm (B1 = B2) | OD, mm | length L, mm | OD / bore | Ruland series with this size |
|---|---|---|---|---|
| 6 | 18 | 30 | 3.00 | MSCX (set screw) |
| 8 | 24 | 35 | 3.00 | MCLC (clamp, keyway); MSCX (set screw) |
| 10 | 29 | 45 | 2.90 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 12 | 29 | 45 | 2.42 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 14 | 34 | 50 | 2.43 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 15 | 34 | 50 | 2.27 | MCLC (clamp, keyway) |
| 16 | 34 | 50 | 2.12 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 20 | 42 | 65 | 2.10 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 25 | 45 | 75 | 1.80 | MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway) |
| 30 | 53 | 83 | 1.77 | MCLC (clamp, keyway); MSCX (set screw) |
| 35 | 67 | 95 | 1.91 | MCLC (clamp, keyway); MSCX (set screw) |
| 40 | 77 | 108 | 1.93 | MCLC (clamp, keyway); MSCX (set screw) |
| 50 | 85 | 124 | 1.70 | MCLC (clamp, keyway); MSCX (set screw) |
| 3 (MCLX-3-3-A, aluminum) | 15 | 22 | 5.00 | MCLX one-piece clamp; clamp screw M2 (1.5 mm key), 4 screws; max shaft penetration 11 mm |
| 6 and 8 (MCLX-8-6-F) | 24 | 35 | — | MCLX with two bores (8 mm and 6 mm), steel |
| 10 and 8 (MCLX-10-8-F) | 29 | 45 | — | MCLX with two bores (10 and 8 mm) |
| 20 and 16 (MCLX-20-16-F) | 42 | 65 | — | MCLX with two bores (20 and 16 mm) |
| 25 and 20 (MCLX-25-20-F) | 45 | 75 | — | MCLX with two bores (25 and 20 mm); clamp screw M6 (5 mm key), 4 screws |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| bore B1 / B2 | Ø6 to Ø50 (same bore both ends) and two-bore MCLX | shaft of the same nominal diameter; Ruland's MCLX-3-3-A bore tolerance +0.050 / +0.012, recommended shaft +0 / −0.013 | clamp | all |
| keyway | on MCLC and MSCC | parallel key on the shaft (keyway width and depth not read; see the key pages) | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
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=rigid-shaft-couplings-ruland-mclc-mscx
Fits with
Questions
What size is a 10 mm rigid shaft coupling?
Ruland MCLC / MSCX-10-10: OD 29 mm, length 45 mm (the 12 mm bore has the same OD and length).
What size is a 16 mm rigid coupling?
OD 34 mm, length 50 mm (the 14 and 15 mm bores share them).
What clamp screw does a Ruland MCLX-25-20 use?
Four M6 forged clamp screws with a 5 mm hex wrench; OD 45, length 75.
What shaft tolerance is recommended?
Ruland's MCLX-3-3-A sheet gives a bore tolerance of +0.050 / +0.012 mm and a recommended shaft of +0.000 / −0.013 mm.