Imperial Inch Deep Groove Ball Bearings — Interchange Chart
Imperial deep groove ball bearings are still fitted in British-built motors, pumps, gearboxes and older machinery. Use this chart to match the same size across RLS / RMS, LS / MS and LJ / MJ numbers. The size number is the bore in eighths of an inch — size 8 = 1" bore (25.40 mm). Sizes run from 1/2" to 7 1/2".
RLS / LS / LJ — Light series
Light-section imperial deep groove ball bearings.
| Bore (inch) | Bore (mm) | SKF | FAG | RHP | Quote |
|---|---|---|---|---|---|
| 1/2" | 12.70 | RLS 4 | LS 5 | LJ 1/2 | Quote |
| 5/8" | 15.88 | RLS 5 | LS 7 | LJ 5/8 | Quote |
| 3/4" | 19.05 | RLS 6 | LS 8 | LJ 3/4 | Quote |
| 7/8" | 22.22 | RLS 7 | LS 9 | LJ 7/8 | Quote |
| 1" | 25.40 | RLS 8 | LS 10 | LJ 1 | Quote |
| 1 1/8" | 28.57 | RLS 9 | LS 11 | LJ 1 1/8 | Quote |
| 1 1/4" | 31.75 | RLS 10 | LS 12 | LJ 1 1/4 | Quote |
| 1 3/8" | 34.92 | RLS 11 | LS 12.1/2 | LJ 1 3/8 | Quote |
| 1 1/2" | 38.10 | RLS 12 | LS 13 | LJ 1 1/2 | Quote |
| 1 5/8" | 41.27 | RLS 13 | LS 13.1/2 | LJ 1 5/8 | Quote |
| 1 3/4" | 44.45 | RLS 14 | LS 14 | LJ 1 3/4 | Quote |
| 1 7/8" | 47.63 | RLS 15 | LS 14.1/2 | LJ 1 7/8 | Quote |
| 2" | 50.80 | RLS 16 | LS 15 | LJ 2 | Quote |
| 2 1/4" | 57.15 | RLS 18 | LS 16 | LJ 2 1/4 | Quote |
| 2 1/2" | 63.50 | RLS 20 | LS 17 | LJ 2 1/2 | Quote |
| 2 3/4" | 69.85 | RLS 22 | LS 18 | LJ 2 3/4 | Quote |
| 3" | 76.20 | RLS 24 | LS 19 | LJ 3 | Quote |
| 3 1/4" | 82.55 | RLS 26 | LS 19.1/2 | LJ 3 1/4 | Quote |
| 3 1/2" | 88.90 | RLS 28 | LS 20 | LJ 3 1/2 | Quote |
| 3 3/4" | 95.25 | RLS 30 | LS 20.1/2 | LJ 3 3/4 | Quote |
| 4" | 101.60 | RLS 32 | LS 21 | LJ 4 | Quote |
| 4 1/4" | 107.95 | RLS 34 | LS 21.1/2 | LJ 4 1/4 | Quote |
| 4 1/2" | 114.30 | RLS 36 | LS 22 | LJ 4 1/2 | Quote |
| 4 3/4" | 120.65 | RLS 38 | LS 22.1/2 | LJ 4 3/4 | Quote |
| 5" | 127.00 | RLS 40 | LS 23 | LJ 5 | Quote |
| 5 1/2" | 139.70 | RLS 44 | LS 23.1/2 | LJ 5 1/2 | Quote |
| 6" | 152.40 | RLS 48 | LS 24 | LJ 6 | Quote |
| 6 1/2" | 165.10 | RLS 52 | LS 24.1/2 | LJ 6 1/2 | Quote |
| 7" | 177.80 | RLS 56 | LS 25 | LJ 7 | Quote |
| 7 1/2" | 190.50 | RLS 60 | LS 25.1/2 | LJ 7 1/2 | Quote |
RMS / MS / MJ — Medium series
Medium-section imperial deep groove ball bearings for heavier radial loads.
| Bore (inch) | Bore (mm) | SKF | FAG | RHP | Quote |
|---|---|---|---|---|---|
| 1/2" | 12.70 | RMS 4 | MS 5 | MJ 1/2 | Quote |
| 5/8" | 15.88 | RMS 5 | MS 7 | MJ 5/8 | Quote |
| 3/4" | 19.05 | RMS 6 | MS 8 | MJ 3/4 | Quote |
| 7/8" | 22.22 | RMS 7 | MS 9 | MJ 7/8 | Quote |
| 1" | 25.40 | RMS 8 | MS 10 | MJ 1 | Quote |
| 1 1/8" | 28.57 | RMS 9 | MS 11 | MJ 1 1/8 | Quote |
| 1 1/4" | 31.75 | RMS 10 | MS 12 | MJ 1 1/4 | Quote |
| 1 3/8" | 34.92 | RMS 11 | MS 12.1/2 | MJ 1 3/8 | Quote |
| 1 1/2" | 38.10 | RMS 12 | MS 13 | MJ 1 1/2 | Quote |
| 1 5/8" | 41.27 | RMS 13 | MS 13.1/2 | MJ 1 5/8 | Quote |
| 1 3/4" | 44.45 | RMS 14 | MS 14 | MJ 1 3/4 | Quote |
| 1 7/8" | 47.63 | RMS 15 | MS 14.1/2 | MJ 1 7/8 | Quote |
| 2" | 50.80 | RMS 16 | MS 15 | MJ 2 | Quote |
| 2 1/4" | 57.15 | RMS 18 | MS 16 | MJ 2 1/4 | Quote |
| 2 1/2" | 63.50 | RMS 20 | MS 17 | MJ 2 1/2 | Quote |
| 2 3/4" | 69.85 | RMS 22 | MS 18 | MJ 2 3/4 | Quote |
| 3" | 76.20 | RMS 24 | MS 19 | MJ 3 | Quote |
| 3 1/4" | 82.55 | RMS 26 | MS 19.1/2 | MJ 3 1/4 | Quote |
| 3 1/2" | 88.90 | RMS 28 | MS 20 | MJ 3 1/2 | Quote |
| 3 3/4" | 95.25 | RMS 30 | MS 20.1/2 | MJ 3 3/4 | Quote |
| 4" | 101.60 | RMS 32 | MS 21 | MJ 4 | Quote |
| 4 1/4" | 107.95 | RMS 34 | MS 21.1/2 | MJ 4 1/4 | Quote |
| 4 1/2" | 114.30 | RMS 36 | MS 22 | MJ 4 1/2 | Quote |
| 4 3/4" | 120.65 | RMS 38 | MS 22.1/2 | MJ 4 3/4 | Quote |
| 5" | 127.00 | RMS 40 | MS 23 | MJ 5 | Quote |
| 5 1/2" | 139.70 | RMS 44 | MS 23.1/2 | MJ 5 1/2 | Quote |
| 6" | 152.40 | RMS 48 | MS 24 | MJ 6 | Quote |
| 6 1/2" | 165.10 | RMS 52 | MS 24.1/2 | MJ 6 1/2 | Quote |
| 7" | 177.80 | RMS 56 | MS 25 | MJ 7 | Quote |
| 7 1/2" | 190.50 | RMS 60 | MS 25.1/2 | MJ 7 1/2 | Quote |
Can't find your inch bearing?
Send the number stamped on your old bearing, or bore × OD × width. SLS sources inch deep groove ball bearingsfrom India and overseas and confirms the exact equivalent before dispatch.
Send an enquiryBrand names and catalogue numbers are used only for size cross-reference and remain the property of their owners. SLS is not affiliated with them. Always confirm dimensions against your existing bearing; stock is confirmed only when quoted.