# 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?

- Category: Hardware › Bearings, rails & motion
- Kind: 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
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**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.

## 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.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp 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 |

## Sizes

| 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 |

## Where the files are

- Ruland: [One-piece rigid clamp couplings MCLC, metric dimensions: bore B1, B2, length L, OD, 4,000 rpm](https://www.ruland.com/rigid-couplings/one-piece-rigid-coupling/dimensions-metric.html) — web — Publisher's page; dimensions are facts
- Ruland: [Set screw rigid couplings MSCX (keyway no), metric: bore, length, OD](https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/keyway-no.html) — web — Publisher's page; dimensions are facts
- Ruland: [Set screw rigid couplings with keyway MSCC, metric: bore, OD, length](https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/mscc-with-keyway-metric.html) — web — Publisher's page; dimensions are facts
- Ruland: [MSCX-6-6-F: set screw M4, hex wrench 2 mm, 4 screws, shaft penetration 15 mm, seating torque 2.2 Nm](https://www.ruland.com/mscx-6-6-f.html) — web — Publisher's page; dimensions are facts
- RS Components (Ruland datasheet): [MCLX-3-3-A: bore 3, OD 15, L 22, clamp screw M2, wrench 1.5, 4 screws, bore tolerance +0.050 / +0.012, shaft +0 / -0.013](https://docs.rs-online.com/c4f4/A700000013939857.pdf) — web — Publisher's page; dimensions are facts
- RS Components (Ruland datasheet): [MCLX-25-20-F: bores 25 and 20, OD 45, L 75, clamp screw M6, wrench 5 mm, 4 screws](https://docs.rs-online.com/f866/A700000014000251.pdf) — web — Publisher's page; dimensions are facts
- Zoro (Ruland listings): [MCLX-8-6-F (OD 24, L 35), MCLX-10-8-F (OD 29, L 45), MCLX-20-16-F (OD 42, L 65) as printed in the listing titles](https://zoro.com/ruland-rigid-coupling-1-pc-8x6mm-steel-od-24-mm-l-35-mm-mclx-8-6-f/i/G7099552) — web — Publisher's page; dimensions are facts

## 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.

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