Z & Y Series Resilient Coupling: RC 1 to RC 23
Super Mech Industries makes its resilient coupling in a Z series and a Y series: a torsionally flexible coupling with spring and rubber elements that absorbs start-up shock and vibration, reduces transmission noise and accepts limited shaft misalignment. It is made in Ahmedabad in 18 sizes, RC 1 to RC 23, with bores up to 173 mm.
Resilient Couplings in the Z & Y Series use spring and rubber components arranged in a manner that provides high torsional flexibility. These couplings are specially designed to absorb shocks and vibrations during start-up and operation, reduce transmission noise, and accommodate limited shaft misalignments. They are widely used in machinery where frequent starting, reversing, or shock loads are encountered. Their rugged design and efficient damping capabilities make them ideal for harsh industrial conditions.
Key Features
- Torsionally flexible with rubber and spring elements
- Dampens torsional vibrations and shocks
- Permits limited misalignment
- Helps reduce starting torque and mechanical noise
- Robust construction for continuous heavy-duty service
Specifications
- Torque Range: 100-15,000 Nm
- Bore Sizes: Up to 173mm (stock rough bore 10-85mm)
- Safe Speed: 1,100-5,650 RPM, by size
- Temperature Range: -20°C to +80°C
- Material: Cast iron hubs with spring-steel and rubber insert elements
Applications
- Crane and hoist drives
- Steel rolling mills
- Material handling equipment
- Pumps and compressors
- Heavy-duty industrial gearboxes
Z & Y series resilient coupling sizes: RC 1 to RC 23
Every RC size from the SMI spec sheet, with clear outside diameter, boss lengths, removal space, gap, cover bore, safe speed, stock and maximum bore, and weight. Torque ratings are confirmed on enquiry.
Resilient couplings RC (Z & Y series) — dimensions and speed limits
Sizes RC 1 to RC 23 (RC 20 onwards for horizontal shafts only). Dimensions in mm; safe speed in rpm; weight in kg.
| Model | Clear OD (mm) | Boss length L1 (mm) | Boss length L2 (mm) | Removal space RS (mm) | Gap G (mm) | Cover bore CB (mm) | Safe speed (rpm) | Stock rough bore (mm) | Max bore (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| RC 1 | 105.00 | 38 | 38 | 52 | 0.85 | 44.52 | 5650 | 10 | 29 | 3 |
| RC 2 | 120.50 | 38 | 38 | 52 | 0.85 | 58.80 | 4750 | 12 | 38 | 4 |
| RC 3 | 144.50 | 44.5 | 44.5 | 59 | 0.85 | 62.00 | 4450 | 16 | 41 | 5 |
| RC 4 | 171.50 | 51 | 51 | 59 | 0.85 | 87.45 | 3400 | 16 | 57 | 9 |
| RC 6 | 190.50 | 51 | 51 | 79 | 0.85 | 84.25 | 3200 | 16 | 54 | 11 |
| RC 7 | 197.00 | 57 | 57 | 79 | 0.85 | 96.25 | 2950 | 16 | 64 | 15 |
| RC 8 | 222.00 | 63.50 | 63.50 | 79 | 0.85 | 119.20 | 2500 | 25 | 78 | 20 |
| RC 9 | 254.00 | 70 | 70 | 80 | 0.85 | 143.00 | 2150 | 25 | 92 | 27 |
| RC 10 | 276.00 | 89 | 89 | 80 | 0.85 | 165.20 | 1900 | 25 | 108 | 43 |
| RC 11 | 295.00 | 102 | 102 | 128 | 1.60 | 155.70 | 1800 | 38 | 102 | 54 |
| RC 13 | 324.00 | 105.50 | 105.50 | 147 | 1.60 | 187.46 | 1650 | 50 | 123 | 63 |
| RC 14 | 336.50 | 101.50 | 101.50 | 147 | 1.60 | 184.28 | 1550 | 50 | 121 | 72 |
| RC 15 | 375.00 | 114 | 114 | 147 | 1.60 | 222.38 | 1350 | 50 | 146 | 104 |
| RC 17 | 425.50 | 127 | 127 | 147 | 1.60 | 254.00 | 1200 | 50 | 167 | 149 |
| RC 18 | 432.00 | 140 | 140 | 179 | 3.20 | 239.5 | 1200 | 75 | 157 | 175 |
| RC 21 | 432.00 | 140 | 140 | 179 | 3.20 | 239.5 | 1200 | 75 | 157 | 180 |
| RC 22 | 492.00 | 152.50 | 152.50 | 179 | 3.20 | 266.70 | 1100 | 85 | 173 | 207 |
| RC 23 | 492.00 | 152.50 | 152.50 | 179 | 3.20 | 266.70 | 1100 | 85 | 173 | 216 |
- Torque ratings for the RC series are on the spec sheet drawing and are quoted on enquiry.
Source: SMI spec sheet resilient-coupling-z-y-series.pdf.
Frequently Asked Questions
What is a Z & Y series resilient coupling?
It is SMI's torsionally flexible coupling, made in a Z series and a Y series, that uses spring and rubber elements to absorb shock and vibration, reduce transmission noise and accept limited shaft misalignment.
Where are resilient couplings used?
They suit machinery with frequent starting, reversing or shock loads, such as crane and hoist drives, steel rolling mills, material handling equipment, pumps and compressors, and heavy-duty industrial gearboxes.
What does the RC size chart show?
For each size from RC 1 to RC 23 it gives the clear outside diameter, both boss lengths, removal space, gap, cover bore, safe speed, stock rough bore, maximum bore and weight. Safe speed falls from 5,650 rpm on RC 1 to 1,100 rpm on RC 22 and RC 23.
What torque does each RC size carry?
The published RC table has no labelled torque column. The product specification gives 100 to 15,000 Nm across the series, and SMI confirms the rating for a given RC size on enquiry: send the motor kW and rpm and the type of load.
Can the resilient coupling be used on a vertical shaft?
The RC spec sheet is marked 'For horizontal shafts only'. Ask SMI before specifying one for a vertical shaft.
Where are SMI resilient couplings made?
At SMI's factory in Odhav, Ahmedabad, Gujarat. Super Mech Industries is ISO 9001:2015 certified (Certificate No. 09114716A), holds ZED certification and exports to 29 countries.
What sizes of Resilient Coupling - Z & Y Series does SMI manufacture?
SMI lists 18 sizes from RC 1 to RC 23, with bores finished up to 173 mm. The full size chart with dimensions is on this page and on the spec sheet.
Exported from Ahmedabad to 29 countries
Super Mech Industries exports from Ahmedabad, India to 29 countries, shipping from Mundra Port (Gujarat) or JNPT (Nhava Sheva, Mumbai).
Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.