- Flanged
- FUN 20 Series
- FUN 32 Series
- Solid Section
- SUN 20 Series
- SUN 25 Series
- SUN X14 Crossed Roller Series
- Flanged
- FEG 20 Series
- FEG 32 Series
- Solid Section
- SEG 20 Series
- SEG 25 Series
- SEG X14 Crossed Roller Series
- Flanged
- FIG 20 Series
- FIG 32 Series
- Solid Section
- SIG 20 Series
- SIG 25 Series
- SIG X14 Crossed Roller Series
Product Catalogue
Find Out More
Product Catalogue
Find Out More
- Flanged
- FUN 20 Series
- FUN 32 Series
- Solid Section
- SUN 20 Series
- SUN 25 Series
- SUN X14 Crossed Roller Series
- Flanged
- FEG 20 Series
- FEG 32 Series
- Solid Section
- SEG 20 Series
- SEG 25 Series
- SEG X14 Crossed Roller Series
- Flanged
- FIG 20 Series
- FIG 32 Series
- Solid Section
- SIG 20 Series
- SIG 25 Series
- SIG X14 Crossed Roller Series
HRC Couplings
Couplings connect two shafts for the purposes of power transmission between the driver and the driven device.
The type of coupling used depends on factors including speed power and shaft alignment.
NBC offers an an extensive range of coupling systems to meet the specific requirements of customers, we can provide specific solutions across a diverse range of industries.
Our range includes
- Rigid
- Tyre
- JAW
- Grid
Key Features
- Wide stock range for most industrial purposes
- Can absorb shock loading & drive misalignment resulting in extended machine life
- Maintenance-free with long life expectancy
- Effective operation
Our engineers design, manufacture, and supply components to your exact specification. Contact us to discuss your project.
HRC couplings are similar to Jaw couplings in construction but offer a cost-effective solution for higher loads and speeds. A taper bush fixing allows for quick and easy assembly, with the interlocking “dogs” offering a fail-safe capability.
HRC couplings consist of 2 cast-iron halves attached to shafts by means of either hub mount (H Flange) or face mount (F Flange) taper bushes.
Between these two halves is a rubber “spider” that serves as a shock absorber HRC Couplings allow for a limited parallel misalignment (0.5mm) and axial misalignment (1.5mm). Can be used on shafts with taper bushes to 90mm bore or shafts up to 130mm if bored through with keyway.
What are the Typical Uses for Couplings?
- Conveyor drives
- Compressors
- Roller table drives
- Mixers
- Pumps
- Generator Sets
- Line Shafts
Basic coupling dimensions
| Coupling No | Nominal torque | Overall dia. | Hub dia. | Element | Parallel misalignment | Weight | Assembled length | |
| Ring dia. | Width | |||||||
| A | B | G | FF,FH,HH | |||||
| Nm | mm | mm | mm | mm | mm | kg | mm | |
| 70 | 31 | 69 | 60 | 31 | 18.5 | 0.3 | 1 | 65.5 |
| 90 | 80 | 85 | 70 | 32 | 22.5 | 0.3 | 1.17 | 69.5 |
| 110 | 160 | 112 | 100 | 45 | 29.5 | 0.3 | 5 | 82.5 |
| 130 | 315 | 130 | 105 | 50 | 36.5 | 0.4 | 5.46 | 89.5 |
| 150 | 600 | 150 | 115 | 62 | 40.5 | 0.4 | 7.11 | 107.5 |
| 180 | 950 | 180 | 125 | 77 | 49.5 | 0.4 | 16.65 | 142.5 |
| 230 | 2000 | 225 | 155 | 99 | 59.5 | 0.5 | 26.05 | 164.5 |
| 280 | 3150 | 275 | 206 | 119 | 74.5 | 0.5 | 50.05 | 207.5 |
Suitable taper bush and shaft sizes
| Coupling No | Maximum bore | Shoulder width | |||
| D | C | ||||
| mm | in | mm | mm | ||
| 70 | 1008 | 25 | 1 | 20 | 23.5 |
| 90 | 1108 | 28 | 1.1/8 | 19.5 | 23.5 |
| 110 | 1610 | 42 | 1.5/8 | 18.5 | 26.5 |
| 130 | 1610 | 42 | 1.5/8 | 18 | 26.5 |
| 150 | 2012 | 50 | 2 | 23.5 | 33.5 |
| 180 | 2517 | 60 | 2.1/2 | 34.5 | 46.5 |
| 230 | 3020 | 75 | 3 | 39.5 | 52.5 |
| 280 | 3525 | 100 | 4 | 51 | 66.5 |
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Selection of HRC Couplings
1. Design power = motor power x service factor
2. Select suitable coupling based on shaft speed and power from the table below
3. Check that this coupling can accommodate taper bushes big enough for your shaft, if not select a larger coupling.
Service factor
| Electric motors | Internal Combustion Engines | |||||
| Hours/day | <8 | 8-16 | >16 | <8 | 8-16 | >16 |
| Uniform load | 1 | 1.12 | 1.25 | 1.25 | 1.4 | 1.6 |
| Moderate shock | 1.6 | 1.8 | 2 | 2 | 2.24 | 2.5 |
| Heavy shock | 2.5 | 2.8 | 3.12 | 3.12 | 3.55 | 4 |
Coupling power ratings
| Speed | Coupling size | |||||||
| rpm | 70 | 90 | 110 | 130 | 150 | 180 | 230 | 280 |
| 100 | 0.33 | 0.84 | 1.68 | 3.3 | 6.28 | 9.95 | 20.9 | 33 |
| 200 | 0.66 | 1.68 | 3.35 | 6.6 | 12.6 | 19.9 | 41.9 | 65 |
| 400 | 1.32 | 3.35 | 6.7 | 13.2 | 25.1 | 39.8 | 83.8 | 132 |
| 600 | 1.98 | 5.03 | 10.1 | 19.8 | 37.7 | 59.7 | 126 | 198 |
| 720 | 2.37 | 6.03 | 12.1 | 23.8 | 45.2 | 71.6 | 151 | 238 |
| 800 | 2.64 | 6.7 | 13.4 | 26.4 | 50.3 | 79.6 | 168 | 264 |
| 960 | 3.17 | 8.04 | 16.1 | 31.7 | 60.3 | 95.5 | 201 | 317 |
| 1200 | 3.96 | 10.1 | 20.1 | 39.6 | 75.4 | 119 | 251 | 396 |
| 1440 | 4.75 | 12.1 | 24.1 | 47.5 | 90.5 | 143 | 302 | 475 |
| 1600 | 5.28 | 13.4 | 26.8 | 52.8 | 101 | 159 | 335 | 528 |
| 1800 | 5.94 | 15.1 | 30.2 | 59.4 | 113 | 179 | 377 | 594 |
| 2000 | 6.6 | 16.8 | 33.5 | 66 | 126 | 199 | 419 | 660 |
| 2200 | 7.26 | 18.4 | 36.9 | 72.6 | 138 | 219 | 461 | 726 |
| 2400 | 7.92 | 20.1 | 40.2 | 79.2 | 151 | 239 | 503 | |
| 2600 | 8.58 | 21.8 | 43.6 | 85.8 | 163 | 259 | 545 | |
| 2880 | 9.5 | 24.1 | 48.3 | 95 | 181 | 286 | ||
| 3000 | 9.9 | 25.1 | 50.3 | 99 | 188 | 298 | ||
| 3600 | 11.9 | 30.1 | 60.3 | 118 | 226 | |||
| Nominal torque | 31.5 | 80 | 160 | 315 | 600 | 950 | 2000 | 3150 |
| Max torque (Nm) | 72 | 180 | 360 | 720 | 1500 | 2350 | 5000 | 7200 |
For any enquiries regarding HRC Couplings, please complete our enquiry form, and a member of our technical team will respond promptly. Alternatively, you can reach out directly to one of our offices using the contact details here. Our specialists are ready to provide guidance and support tailored to your machinery and engineering needs.