The RP-F Flange Type Jaw Flexible Coupling combines a jaw flexible coupling with a bolt-flange hub in four sub-variants (A, B, C, D). A and C types connect flange to shaft; B and D types allow radial installation for fast elastomer replacement without moving either machine. Maximum torque 18,650 N·m; maximum bore Φ220 mm.
The RP-F series integrates the jaw flexible coupling principle with a flanged hub, creating a versatile family designed explicitly for heavy-machinery applications where one or both sides of the drive connection is a machined bolt flange rather than a plain shaft bore. Four structural sub-types — A, B, C, and D — address the different installation geometries encountered in the field, from straightforward flange-and-shaft assemblies to highly confined spaces where the machinery cannot be moved at all during maintenance.
RP-F-A and RP-F-C are suitable for connecting a flange directly to a shaft — the flanged hub bolts to the machine flange while the plain hub slides onto the shaft in the conventional way. This makes them the standard choice for pump-to-motor connections, gearbox output flanges coupled to a secondary shaft, and similar arrangements where one side of the drive has a bolt-circle flange and the other a plain shaft.
RP-F-B and RP-F-D use a double-flange structure that permits radial installation from both ends simultaneously. Neither machine needs to be moved axially, making B and D types the preferred choice for confined installations — between-bearing shaft drives, wall-constrained engine rooms, and retrofit projects where repositioning the machinery is not viable. Once the bolts of each radial flange are released, the elastomeric spider can be withdrawn and renewed quickly, minimising downtime. The C and D sub-types have a slightly smaller outer diameter, which is useful where space between the coupling flanges and the machine housing is limited. The D type can additionally be manufactured to a customer-specific special flange, offering maximum design freedom.
| Type | Connection | Installation direction | Notes |
|---|---|---|---|
| RP-F-A | Flange to shaft | Axial | Standard flange-and-shaft connection |
| RP-F-B | Flange to flange | Radial (both ends) | Fast elastomer swap; drive end machinery not moved |
| RP-F-C | Flange to shaft | Axial | Smaller outer diameter than A type |
| RP-F-D | Flange to flange | Radial (both ends) | Smaller OD; custom special flanges available |
| Model | Torque (N·m) | Speed (rpm) | Bore d (mm) | D (mm) | D0 (mm) | D1 (mm) | D3 (mm) | E (mm) | S (mm) |
|---|---|---|---|---|---|---|---|---|---|
| RP24F | 35 | 14000 | 8–35 | 55 | 80 | 40 | 55 | 18 | 2 |
| RP28F | 95 | 11800 | 10–40 | 65 | 100 | 48 | 65 | 20 | 2.5 |
| RP38F | 190 | 9500 | 12–48 | 80 | 115 | 66 | 78 | 24 | 3 |
| RP42F | 265 | 8000 | 14–55 | 95 | 140 | 75 | 94 | 26 | 3 |
| RP48F | 310 | 7100 | 15–60 | 105 | 150 | 85 | 104 | 28 | 3.5 |
| RP55F | 410 | 6300 | 20–70 | 120 | 175 | 98 | 118 | 30 | 4 |
| RP65F | 625 | 5600 | 22–75 | 135 | 190 | 115 | 134 | 35 | 4.5 |
| RP75F | 1280 | 4750 | 30–90 | 160 | 215 | 135 | 158 | 40 | 5 |
| RP90F | 2400 | 3750 | 40–100 | 200 | 260 | 160 | 180 | 45 | 5.5 |
| RP100F | 3300 | 3350 | 50–110 | 225 | 285 | 180 | 200 | 50 | 6 |
| RP110F | 4800 | 3000 | 60–125 | 255 | 330 | 200 | 230 | 55 | 6.5 |
| RP125F | 6650 | 2650 | 60–145 | 290 | 370 | 230 | 265 | 60 | 7 |
| RP140F | 8600 | 2360 | 60–165 | 320 | 410 | 256 | 300 | 65 | 7.5 |
| RP160F | 12800 | 2000 | 80–190 | 370 | 460 | 290 | 345 | 75 | 9 |
| RP180F | 18650 | 1800 | 85–220 | 420 | 520 | 325 | 400 | 85 | 10.5 |
The RP-F family is deployed wherever a flange interface is the natural connection point on one or both sides of the drive. Typical sectors include heavy industrial process plant, power generation, marine, and offshore industries. Key application groups include:
For a shaft-to-shaft flanged option, see the RP-SF/RP-DF single and double flange coupling. The full range is available in the coupling catalogue.
🇳🇱 Netherlands — Diesel Generator OEM
A Rotterdam-based generator manufacturer used RP-F-A couplings to connect diesel engine flywheel flanges to alternator shafts across their 200–1200 kVA range. The polyurethane spider reduced torsional shock transmission to the alternator windings, extending alternator bearing life noticeably compared with the rigid disc coupling previously specified.
★★★★★
"The RP-F-A became our standard across the whole gen-set range after the first season." — Product Manager
🇩🇪 Germany — Process Pump Manufacturer
A chemical process pump OEM in Ludwigshafen standardised on the RP-F-B for their API 610 between-bearing pumps. The radial assembly principle allowed field engineers to replace worn elastomers in under 30 minutes without disturbing the pump or motor alignment — a significant advantage in the continuous-process plants where the pumps operate.
★★★★★
"Elastomer replacement time reduced from four hours to 25 minutes." — Service Engineer
🇳🇴 Norway — Offshore Support Vessel
An offshore vessel operator based in Bergen specified RP-F-D couplings for thruster gearbox-to-motor connections where the machinery room limited the available space. The smaller outer diameter of the D type cleared the housing wall by 8 mm — just enough to allow installation in a location where the larger A or B type would not have fitted.
★★★★★
"The custom flange option on the D type solved a design problem that had held us up for weeks." — Vessel Engineer
Use RP-F-A when one side of the drive has a bolt-circle flange and the other a plain shaft, and when there is sufficient axial clearance to slide the coupling body onto the shaft during installation. Use RP-F-B when both sides have flanges and you want the maintenance advantage of radial assembly — particularly important when the machinery is piped or bolted in place and cannot be moved axially during service.
The RP-F-D can be manufactured to customer-specific flange drawings, covering non-standard bolt-circle diameters, bolt quantities, flange thicknesses, and outer diameters. This makes the D type the most flexible option in the F series for retrofit applications where the machine flange was designed to a non-standard specification. Contact us with your flange drawing for a technical feasibility assessment and quotation.
Yes — for a given size number (e.g., RP65), the polyurethane spider is identical across A, B, C, and D sub-types. This means a single spare spider covers all four variants, simplifying inventory management when multiple coupling types are used within the same installation or plant.
The ordering reference includes: size code + F + sub-type letter (+ bore if sub-type A or C). For example: RP42F-A-35 is an RP42 size, A sub-type, with a 35 mm bore. For B and D types, both hub bore diameters are specified separately. Include your required keyway dimensions, sleeve type, and any special flange requirements when contacting us for a quotation.
The largest model in the F series, the RP180F, accommodates bore diameters from 85 mm up to 220 mm with a nominal torque of 18,650 N·m and a maximum speed of 1,800 rpm. Custom bore machining within the stated range is available for all sub-types.
RP works with OEM manufacturers, engineering firms, and international distributors on flange coupling projects across all industrial sectors. Custom flanges, bore specifications, special elastomers, and volume pricing are all available. Share your application details and drawings with our technical team for a comprehensive recommendation.
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