Brake Drum Gear Coupling Manufacturer in India
Super Mech Industries manufactures brake drum gear couplings — CI brake drum + gear coupling in one unit — in two catalogue ranges: SBDC, with drums from 150 mm to 500 mm, and SBDGC, with drums from 4 in to 12 in, rated 500 to 31,500 Nm.
Brake Drum Gear Coupling — Key Facts
Drum materialGrade CI (grey cast iron) — standard; SG iron on requestDrum diameter rangeSBDC 150–500 mm; SBDGC 4–12 in (101.6–304.8 mm)Torque rangeSBDC 500–21,950 Nm; SBDGC 980–31,500 NmHub boreCustom machined to shaft diameterBrake compatibilityShoe brake or caliper brakeCoupling typeGear coupling (crowned hub + sleeve)What Is a Brake Drum Gear Coupling?
A brake drum gear coupling integrates two functions into one assembly: the power transmission function of a gear coupling and the braking function of a brake drum. The outer sleeve — which in a standard gear coupling carries only the internal teeth for the gear mesh — is extended and machined on its outer diameter to act as a brake drum. A shoe brake or caliper brake acts on this drum OD when braking torque is required.
Inside the sleeve, the standard crowned gear mesh transmits drive torque between the motor shaft hub and the driven machine shaft hub — exactly as in a conventional full or half gear coupling. The braking and power transmission functions share the same rotating component, eliminating the weight, cost, and shaft space that a separate brake disc or drum would require.
The CI sleeve provides good thermal mass for dissipating brake heat during multiple braking cycles. The drum OD is machined to a tight tolerance for even brake lining contact and predictable braking torque.
One Unit — Two Functions
Replaces a separate gear coupling + brake drum assembly. Reduces shaft length, total weight, and assembly complexity in crane and hoist drive trains.
Easy Brake Lining Access
Brake shoes or caliper acts on the OD of the sleeve from outside. No disassembly of the gear coupling is needed to replace brake linings — the gear mesh remains intact during brake maintenance.
Standard CI Material for Cost Control
Grey cast iron sleeve is the standard specification — the same material used in automotive and industrial brake drums. Cost-effective and readily machineable for custom drum dimensions.
Brake Drum Gear Coupling — Standard Size Range
SMI makes two brake drum ranges: SBDC (brake drum with gear coupling), drums 150 mm to 500 mm, and SBDGC (brake drum geared coupling), drums 4 in to 12 in. Ratings and dimensions are as published on the spec sheet. Hub bores are machined to your shaft within the listed maximum.
Brake drum with gear coupling (SBDC) — ratings and dimensions
Sizes SBDC 150 to SBDC 500 (drum diameter in mm). Torque in Nm; bores and dimensions in mm; weight in kg.
| Size | Bore minmm | Max bore D1mm | Max bore D2mm | TorqueNm | Max speedrpm | ØA (drum)mm | ØB1mm | ØB2mm | C1mm | C2mm | ØEmm | ØFmm | Gmm | Hmm | Imm | Lmm | Weightkg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SBDC 150 | 15 | 40 | 32 | 500 | 7900 | 150 | 65 | 50 | 64 | 45 | 75 | 120 | 1 | 80 | 95 | 110 | 7.600 |
| SBDC 160 | 15 | 45 | 32 | 500 | 7900 | 160 | 70 | 50 | 74 | 45 | 75 | 120 | 1 | 90 | 110 | 120 | 9.000 |
| SBDC 178 | 15 | 45 | 32 | 700 | 8100 | 178 | 70 | 50 | 74 | 45 | 75 | 120 | 1 | 90 | 110 | 120 | 10.500 |
| SBDC 200 | 20 | 55 | 40 | 1000 | 6400 | 200 | 90 | 65 | 77 | 55 | 110 | 170 | 2 | 100 | 120 | 134 | 15.500 |
| SBDC 250 | 20 | 65 | 40 | 1000 | 6400 | 250 | 105 | 65 | 77 | 55 | 110 | 170 | 2 | 120 | 130 | 134 | 24.500 |
| SBDC 250A | 20 | 65 | 55 | 2710 | 5000 | 250 | 105 | 85 | 77 | 70 | 125 | 185 | 2 | 120 | 130 | 149 | 27.000 |
| SBDC 300 | 30 | 85 | 68 | 4900 | 4000 | 300 | 130 | 105 | 105 | 85 | 150 | 220 | 2 | 150 | 170 | 192 | 50.000 |
| SBDC 300A | 40 | 85 | 85 | 9200 | 3350 | 300 | 130 | 130 | 105 | 105 | 175 | 250 | 2 | 150 | 170 | 212 | 57.000 |
| SBDC 375 | 40 | 85 | 85 | 9200 | 3350 | 375 | 135 | 130 | 110 | 105 | 175 | 250 | 3 | 165 | 185 | 218 | 84.000 |
| SBDC 400 | 40 | 95 | 85 | 9200 | 3350 | 400 | 150 | 130 | 118 | 105 | 175 | 250 | 3 | 180 | 210 | 226 | 91.000 |
| SBDC 400A | 40 | 95 | 100 | 14300 | 2800 | 400 | 150 | 155 | 116 | 110 | 200 | 290 | 4 | 180 | 210 | 230 | 100.000 |
| SBDC 450 | 40 | 110 | 100 | 14300 | 2800 | 450 | 170 | 155 | 120 | 110 | 200 | 290 | 5 | 200 | 220 | 235 | 123.000 |
| SBDC 450A | 40 | 110 | 110 | 21950 | 2500 | 450 | 170 | 175 | 120 | 125 | 230 | 320 | 5 | 200 | 220 | 250 | 132.000 |
| SBDC 500 | 50 | 135 | 110 | 21950 | 2500 | 500 | 210 | 175 | 145 | 125 | 230 | 320 | 5 | 225 | 250 | 275 | 189.000 |
- Dimension letters refer to the drawing on the SMI spec sheet.
Source: SMI spec sheet brake-drum-flexible-geared-coupling.pdf
Brake drum geared couplings (SBDGC) — ratings and dimensions
Drum sizes 4 in to 12 in. Torque in Nm; finished bore range and dimensions in mm; weight in kg.
| Size (drum) | TorqueNm | Max speedrpm | Bore minmm | Bore maxmm | ØA (drum)mm | ØBmm | Cmm | ØDmm | Emm | Lmm | L1mm | L2mm | Weightkg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SBDGC 4" | 980 | 8000 | 15 | 40 | 101.6 | 80 | 70 | 65 | 15 | 102.5 | 43 | 57 | 5.0 |
| SBDGC 5.5" | 1600 | 6300 | 15 | 45 | 139.7 | 85 | 85 | 70 | 20 | 125 | 55 | 67 | 12.6 |
| SBDGC 6" | 2450 | 6300 | 15 | 45 | 152.5 | 90 | 85 | 70 | 20 | 125 | 55 | 67 | 14.0 |
| SBDGC 6.3" | 2450 | 6300 | 15 | 45 | 160.0 | 90 | 85 | 70 | 20 | 125 | 55 | 67 | 16.0 |
| SBDGC 7" | 4400 | 5000 | 20 | 55 | 177.8 | 120 | 95 | 85 | 20 | 140 | 60 | 75 | 20.0 |
| SBDGC 8" | 8350 | 4000 | 20 | 75 | 203.2 | 120 | 95 | 120 | 20 | 145 | 58 | 82 | 26.8 |
| SBDGC 10" | 19620 | 3350 | 25 | 90 | 254.0 | 150 | 115 | 140 | 20 | 170 | 73 | 92 | 50.0 |
| SBDGC 12" | 31500 | 2850 | 25 | 110 | 304.8 | 225 | 125 | 175 | 30 | 204 | 75 | 124 | 68.0 |
- Dimension letters refer to the drawing on the SMI spec sheet.
Source: SMI spec sheet brake-drum-flexible-geared-coupling.pdf
Coupling torque ratings are for the gear mesh. Brake torque is determined by the brake actuator and lining — contact your brake supplier for brake torque sizing. Call SMI at +91 63510 70577 to match coupling torque class to brake drum diameter.
A trusted name in industrial power transmission
Delivering quality couplings for over a decade
18+Years of experience
128+Products in range
300+Happy clients
29Export countries
Certifications & Awards
Our commitment to quality is validated by internationally recognized certifications and industry awards.
Proudly Make in India
Brake Drum Gear Coupling Applications
EOT Cranes (Electric Overhead Travelling)
The most common application. Long travel, cross travel, and hoist motion drives all use brake drum couplings for integrated braking. Drive motor shaft is connected to gearbox via brake drum coupling — motor brake acts on drum to hold load during power loss.
Wire Rope Hoists & Winches
Hoist drum drives where the motor-to-gearbox coupling must also serve as the brake mounting point. The brake drum sleeve provides the braking surface for the electrically released brake that holds the suspended load.
Inclined & Overhead Conveyors
Conveyors carrying material on an incline require hold-back braking to prevent reverse runback during power loss. Brake drum gear coupling on the drive provides this — shoe brake acts on drum OD to hold conveyor stationary.
Steel Plant Transfer Cars & Ladle Cars
Transfer car drives in steel plants need coupling + braking in compact drive trains. Brake drum gear coupling eliminates separate drum assembly on limited-length drive shafts.
Related Coupling Types
Flexible Gear Coupling Manufacturer
Full overview — all flexible gear coupling types
Types of Gear Couplings
Full, half, brake drum, spacer, nylon — guide
Brake Drum Gear Coupling — FAQ
Brake Drum Gear Coupling — Available Range
SBDC drums 150–500 mm and SBDGC drums 4–12 in, manufactured at Odhav, Ahmedabad. Custom drum OD and bore to order.
Full Gear Coupling
Flexible gear couplings designed to transmit torque while accommodating shaft misalignment in heavy industrial applications.
View detailsNylon Gear Coupling
Flexible gear couplings designed to transmit torque while accommodating shaft misalignment in heavy industrial applications.
View detailsBC Type Coupling
Simple, economical coupling with elastomeric spider element for vibration dampening and electrical insulation.
View detailsRB Type Coupling
Durable flexible coupling using rubber bushes in compression, ideal for shock absorption and misalignment tolerance in industrial applications.
View detailsTyre Coupling - A Series
Highly flexible coupling using a rubber tyre element, ideal for absorbing shocks, vibration, and accommodating misalignments.
View detailsTyre Coupling - TC Series
Heavy-duty tyre coupling with taper bush mounting for ease of installation and maintenance in demanding power transmission applications.
View detailsResilient Coupling - Z & Y Series
Torsionally flexible coupling with spring and rubber elements designed for shock absorption, misalignment handling, and noise reduction in industrial drives.
View detailsBrake Drum Geared Coupling
Heavy-duty geared coupling with integrated brake drum, designed for high torque transmission and mechanical braking in industrial drives.
View detailsMore questions about this page
What is a brake drum gear coupling?
A brake drum gear coupling is a dual-function mechanical component that combines a gear coupling with an integral brake drum in a single unit. The outer sleeve of the gear coupling is machined to function as a brake drum — a caliper or shoe brake acts on the outer diameter of the sleeve to provide braking torque, while the internal gear teeth on the same sleeve mesh with the crowned gear hub to transmit drive torque. This eliminates the need for a separate brake disc or drum assembly on the drive shaft.
What material is the brake drum sleeve made of?
SMI manufactures brake drum sleeves from grade CI (Grey Cast Iron) as standard — the same material used for industrial brake drums and flywheels. Cast iron has excellent thermal mass for heat dissipation during repeated braking cycles and good machinability for achieving the tight drum OD tolerance required for brake lining contact. For high-speed or high-duty-cycle applications, SG iron or alloy cast iron variants are available on request.
What type of brake is used with a brake drum gear coupling?
Brake drum gear couplings are compatible with both shoe brakes (internally or externally mounted brake shoes with brake lining) and caliper disc-style brakes acting on the drum OD. The choice depends on the braking torque requirement and the existing brake mounting arrangement. SMI supplies the coupling only — the brake actuator is selected and sourced separately to match your existing brake system.
What applications use brake drum gear couplings?
The most common applications are EOT (Electric Overhead Travelling) cranes, wire rope hoists and winches, overhead conveyors with hold-back braking requirements, and inclined belt conveyors where the load must be held in position during power failure or e-stop events. The integrated drum eliminates the separate shaft-mounted brake drum, reducing coupling assembly length and weight.
Can SMI supply custom drum diameters for brake drum gear couplings?
Yes. Drum diameter (OD) and drum face width can be specified at order time to match an existing shoe brake or caliper brake. SMI machines brake drum sleeves on CNC turning centres at our Odhav, Ahmedabad factory. Provide the required drum OD, face width, brake lining contact area, and the gear coupling torque rating when requesting a custom quotation.
Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.