RB Type Coupling Manufacturer in Ahmedabad, India
An RB type coupling is a pin-bush flexible coupling: two flanged hubs joined by bolts fitted with rubber bushes that work in compression, absorbing shock and vibration and taking misalignment without lubrication. Super Mech Industries makes it in Ahmedabad in 27 sizes, RB-105-3 to RB-2000-26, rated 95 Nm to 1,299,997 Nm, with bores up to 600 mm.
RB Type Couplings, also known as Rubber-in-Compression or Bush Couplings, consist of two flanged hubs connected via high-strength bolts and rubber bushes. The rubber elements work in compression and provide excellent shock absorption, vibration damping, and accommodate misalignments. Their simple, robust design makes them ideal for a wide range of industrial power transmission applications without the need for lubrication or frequent maintenance.
Key Features
- Rubber-in-compression design
- Shock and vibration absorption
- Handles angular, axial, and radial misalignment
- No lubrication required
- Durable and low maintenance
Specifications
- Torque Range: 95-1,299,997 Nm (RB-105-3 to RB-2000-26)
- Bore Sizes: 11-600mm
- Speed: Up to 7,200 RPM (RB-105-3); lower for larger sizes
- Temperature Range: -30°C to +80°C
- Rubber Elements: Natural rubber or synthetic options (e.g. Nitrile)
Applications
- Pumps and compressors
- Material handling systems
- Conveyors
- Fans and blowers
- General industrial machinery
RB type pin-bush couplings — ratings, dimensions and misalignment
Sizes RB-105-3 to RB-2000-26 (outside diameter – number of pins). Power at 100 rpm; torque in Nm; bores and dimensions in mm; weight in kg; WR² in kg·m²; misalignment: axial and radial in mm, angular in degrees.
| Size | kW at 100 rpm | Torque (Nm) | Max speed (rpm) | Bore min (mm) | Max bore B1 (mm) | Max bore B2 (mm) | OD (mm) | ØD1 (mm) | ØD2 (mm) | L (mm) | Gap S (mm) | Weight (kg) | WR² (kg·m²) | Axial ± (mm) | Radial ± (mm) | Angular ± (°) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RB-105-3 | 1.0 | 95 | 7200 | 11 | 30 | 32 | 105 | 48 | 50 | 45 | 2-6 | 2 | 0.0030 | 2 | 0.3 | 1 |
| RB-116-4 | 1.5 | 146 | 6100 | 12 | 39 | 42 | 116 | 60 | 68 | 45 | 2-6 | 2.6 | 0.0050 | 2 | 0.3 | 1 |
| RB-124-4 | 1.7 | 166 | 5500 | 14 | 45 | 50 | 125 | 68 | 78 | 50 | 2-6 | 3.1 | 0.0070 | 2 | 0.4 | 1 |
| RB-144-6 | 3.3 | 318 | 4900 | 18 | 50 | 60 | 144 | 82 | 91 | 55 | 2-6 | 4.3 | 0.012 | 2 | 0.4 | 1 |
| RB-162-6 | 5.5 | 525 | 4500 | 22 | 60 | 65 | 162 | 89 | 100 | 60 | 2-6 | 7.5 | 0.030 | 2 | 0.4 | 1 |
| RB-178-6 | 6.7 | 643 | 3800 | 24 | 70 | 75 | 178 | 105 | 115 | 70 | 2-6 | 10 | 0.040 | 2 | 0.5 | 1 |
| RB-198-10 | 13 | 1248 | 3400 | 28 | 80 | 90 | 198 | 124 | 135 | 80 | 2-6 | 13 | 0.040 | 2 | 0.5 | 1 |
| RB-228-11 | 21 | 2050 | 3000 | 28 | 90 | 100 | 228 | 133 | 146 | 90 | 4-10 | 18 | 0.100 | 3 | 0.6 | 1 |
| RB-252-12 | 32 | 3069 | 2700 | 38 | 105 | 115 | 252 | 156 | 167 | 100 | 4-10 | 24 | 0.17 | 3 | 0.6 | 1 |
| RB-285-11 | 48 | 4552 | 2400 | 48 | 115 | 125 | 285 | 170 | 186 | 110 | 4-10 | 35 | 0.31 | 3 | 0.6 | 1 |
| RB-320-12 | 64 | 6099 | 2100 | 55 | 125 | 135 | 320 | 196 | 212 | 125 | 4-10 | 51 | 0.53 | 3 | 0.7 | 1 |
| RB-360-11 | 93 | 8900 | 1900 | 65 | 135 | 150 | 360 | 212 | 232 | 140 | 4-12 | 73 | 1.02 | 4 | 0.9 | 1 |
| RB-400-10 | 126 | 12051 | 1700 | 75 | 160 | 160 | 410 | 230 | 230 | 160 | 4-12 | 101 | 1.70 | 4 | 1.1 | 1 |
| RB-450-12 | 195 | 18602 | 1500 | 85 | 180 | 180 | 450 | 260 | 260 | 180 | 4-12 | 137 | 2.90 | 4 | 1.1 | 0.5 |
| RB-500-14 | 270 | 25802 | 1350 | 95 | 200 | 200 | 500 | 290 | 290 | 200 | 4-12 | 180 | 4.70 | 4 | 1.1 | 0.4 |
| RB-560-10 | 325 | 31003 | 1200 | 95 | 225 | 225 | 560 | 320 | 320 | 220 | 4-8 | 278 | 10.70 | 2 | 1.5 | 0.3 |
| RB-630-12 | 440 | 41998 | 1050 | 100 | 250 | 250 | 630 | 355 | 355 | 240 | 4-8 | 365 | 17.4 | 2 | 1.5 | 0.3 |
| RB-710-12 | 785 | 75000 | 950 | 100 | 260 | 260 | 710 | 385 | 385 | 260 | 5-9 | 516 | 33 | 2 | 1.8 | 0.3 |
| RB-800-14 | 1047 | 100000 | 850 | 100 | 280 | 280 | 800 | 420 | 420 | 290 | 5-9 | 691 | 53 | 2 | 1.8 | 0.3 |
| RB-900-16 | 1623 | 154998 | 750 | 100 | 305 | 305 | 900 | 465 | 465 | 320 | 5-9 | 927 | 86 | 2 | 1.8 | 0.3 |
| RB-1000-18 | 2042 | 194997 | 680 | 125 | 320 | 320 | 1000 | 515 | 515 | 350 | 5-10 | 1224 | 142.8 | 2 | 2 | 0.1 |
| RB-1120-18 | 2827 | 269997 | 600 | 135 | 350 | 350 | 1120 | 560 | 560 | 380 | 6-11 | 1584 | 231 | 2 | 2.2 | 0.1 |
| RB-1250-20 | 3613 | 344997 | 550 | 150 | 380 | 380 | 1250 | 610 | 610 | 420 | 6-11 | 2070 | 367.5 | 2 | 2.4 | 0.1 |
| RB-1400-20 | 5550 | 529999 | 490 | 175 | 440 | 440 | 1400 | 700 | 700 | 480 | 6-12 | 3060 | 693 | 2 | 2.7 | 0.1 |
| RB-1600-24 | 7854 | 749995 | 430 | 200 | 480 | 480 | 1600 | 770 | 770 | 540 | 6-12 | 3960 | 1155 | 2 | 3 | 0.1 |
| RB-1800-22 | 10210 | 974996 | 380 | 225 | 540 | 540 | 1800 | 870 | 870 | 600 | 8-16 | 5760 | 2205 | 2 | 3.4 | 0.1 |
| RB-2000-26 | 13614 | 1299997 | 340 | 250 | 600 | 600 | 2000 | 960 | 960 | 660 | 8-16 | 7020 | 3255 | 2 | 3.8 | 0.1 |
- Three obvious misprints on the spec sheet are corrected here: RB-320-12 minimum bore 555 → 55 mm, RB-630-12 OD 63 → 630 mm, RB-800-14 length L 29 → 290 mm.
- The spec sheet prints the angular-misalignment unit as an inch mark; it is degrees.
Source: SMI spec sheet rb-type-coupling.pdf.
Frequently Asked Questions
What is the RB Type Coupling used for?
The RB Type Coupling is used in pumps and compressors, material handling systems, conveyors, fans and blowers. Durable flexible coupling using rubber bushes in compression, ideal for shock absorption and misalignment tolerance in industrial applications.
What are the key specifications of the RB Type Coupling?
Key specifications include Torque Range: 95-1,299,997 Nm (RB-105-3 to RB-2000-26); Bore Sizes: 11-600mm; Speed: Up to 7,200 RPM (RB-105-3); lower for larger sizes; Temperature Range: -30°C to +80°C. Custom sizes are available on request.
Does Super Mech Industries offer custom RB Type Coupling sizes?
Yes. SMI manufactures the RB Type Coupling with custom bore, material, and design to your drawing, dispatched from our Odhav, Ahmedabad facility — standard sizes typically ship the same week.
Is the RB Type Coupling from SMI ISO certified?
Yes. Super Mech Industries is ISO 9001:2015 certified (Certificate No. 09114716A) and holds government ZED certification, manufacturing the RB Type Coupling in Ahmedabad, Gujarat, India, with exports to 29 countries.
What sizes of RB Type Coupling does SMI manufacture?
SMI lists 27 sizes from RB-105-3 to RB-2000-26 rated from 95 Nm to 1,299,997 Nm, with bores finished up to 600 mm. The full size chart with dimensions is on this page and on the spec sheet.
Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.