P Type Disc Brake Flexible Jaw Coupling
The P Type Disc Brake Flexible Jaw Coupling integrates a precision brake disc into the coupling hub for use with disc brake caliper actuators. Torque range 190–6,650 N·m, brake disc diameters from 200 to 900 mm. Ideal for hoisting, positioning, and holding applications requiring combined drive torque transmission and positive braking in a compact assembly.
P Type Disc Brake Flexible Jaw Coupling
Integrated disc brake surface on the coupling hub — combining torsional flexibility, vibration damping, and positive disc braking in a single compact assembly for hoisting and positioning drives.
Drive Torque Transmission and Positive Braking in One Assembly
Many drive applications — particularly hoists, cranes, and industrial positioning systems — require both a flexible coupling for torque transmission and a positive braking device on the same shaft. Mounting a separate brake disc assembly alongside a standard coupling increases drive length, adds mass, and creates additional alignment requirements. The P Type Disc Brake Flexible Jaw Coupling integrates both functions into a single hub assembly.
The P Type hub incorporates a precision-machined brake disc surface suitable for standard industrial disc brake caliper actuators. The brake disc is an integral part of the coupling hub casting — not a bolted-on addition — ensuring concentric accuracy and eliminating the potential for loosening under dynamic loading. The elastomeric spider sits between the P Type hub and the second plain hub, providing the same torsional flexibility and vibration isolation as the standard GBC jaw coupling.
Ten model sizes from 38P to 125P cover nominal coupling torques from 190 N·m to 6,650 N·m, with brake disc diameters ranging from 200 mm to 900 mm. Multiple brake disc sizes are available for most model sizes, allowing independent optimisation of coupling torque and braking torque capacity without changing the coupling size or bore configuration.
Why Integrate Brake and Coupling?
Reduced Drive Length
Eliminating a separate brake disc assembly reduces overall axial drive length — critical in space-constrained installations such as elevator machine rooms, crane end-carriages, and mining winder housings.
Concentric Brake Disc Accuracy
The brake disc surface is machined integral with the coupling hub, ensuring concentricity within close tolerances. This eliminates the disc run-out problems that occur with bolted-on disc assemblies, providing more consistent caliper engagement and even pad wear.
Multiple Disc Size Options per Model
Most P Type models offer two to five brake disc diameter options. A larger disc with the same caliper delivers higher braking torque — allowing independent optimisation of coupling torque and maximum braking torque without changing the coupling size.
Single Shaft Position for Both Functions
Both coupling and brake functions act at the same axial position on the drive shaft, minimising the bending moment imposed on the shaft compared to separate mounting positions at different shaft locations.
Full Standard Coupling Characteristics
The P Type retains all characteristics of the standard jaw coupling — zero lubrication, elastomeric vibration damping, misalignment tolerance, and custom bore-and-keyway configuration — while adding the integrated disc brake interface.
Standardised Marking System
P Type models are marked using coupling type, disc diameter, disc thickness, hub pitch diameter, and bore sizes — e.g. TS65P–500×20×61.5 Coupling 50/55 — enabling precise specification and positive identification of installed assemblies.
P Type Series — Technical Specifications
| Model | Nom. Torque (N·m) | Max Speed (rpm) | D (mm) | d₁max (mm) | d₂max (mm) | E (mm) | L₀ (mm) | Brake Disc D₀×T (mm) | N (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 38P | 190 | 9500 | 80 | 48 | 34 | 24 | 114 | 200×15 / 250×15 | 37.5 |
| 42P | 265 | 8000 | 95 | 55 | 42 | 26 | 126 | 250×15 / 315×20 | 40.5 |
| 48P | 310 | 7100 | 105 | 60 | 48 | 28 | 140 | 250×15 / 315×20 / 400×20 | 45.5 |
| 55P | 410 | 6300 | 120 | 70 | 55 | 30 | 160 | 315×20 / 400×20 / 500×20 | 52.5 |
| 65P | 625 | 5600 | 135 | 75 | 65 | 35 | 185 | 315×20 / 400×20 / 500×20 / 630×20 / 710×25 | 61.5 |
| 75P | 1280 | 4750 | 160 | 90 | 75 | 40 | 210 | 315×20 / 400×20 / 500×20 / 630×20 / 710×25 | 69.5 |
| 90P | 2400 | 3750 | 200 | 100 | 100 | 45 | 245 | 400×20 / 500×20 / 630×20 / 710×25 / 800×30 | 89.5 |
| 100P | 3300 | 3350 | 225 | 110 | 100 | 50 | 270 | 400×20 / 500×20 / 630×20 / 710×25 / 800×30 | 98.5 |
| 110P | 4800 | 3000 | 255 | 125 | 110 | 55 | 295 | 400×20 / 500×20 / 630×20 / 710×25 / 800×30 / 900×30 | 96.5 |
| 125P | 6650 | 2650 | 290 | 145 | 130 | 60 | 340 | 500×20 / 630×20 / 710×25 / 800×30 / 900×30 | 112.5 |
Customer Reviews & Case Studies
🇦🇺 Australia — Port & Crane Operations
A container terminal in Fremantle, Western Australia specified 90P couplings with 630×20 mm brake discs on ship-to-shore crane hoist drives. The integrated disc hub eliminated a separate brake mounting frame that had added 340 mm to the previous drive shaft length, allowing the hoist machinery to fit within the crane headroom limit without structural modification to the crane bridge.
★★★★★
"Saved 340 mm of drive length — that was the difference between fitting the crane headroom limit and not."
🇫🇮 Finland — Forestry & Timber Processing
A log sorting facility in Lahti specified 65P couplings with 500×20 mm discs on log crane travel drives. Operating in ambient temperatures as low as −30°C in winter, the polyurethane spider maintained torsional flexibility without hardening, and the integrated disc brake engaged reliably during emergency stops on the heavily loaded crane travel drives throughout the winter operating season.
★★★★☆
"Works in −30°C as advertised. The spider doesn't go brittle and the disc brake holds perfectly."
🇦🇺 Australia — Construction & Infrastructure
A tower crane fleet operator in Sydney standardised 75P couplings with 400×20 mm discs for their 10-tonne capacity luffing jib cranes. The concentric disc accuracy of the integral hub design eliminated the disc run-out issue that had caused uneven pad wear in the previous bolted-disc arrangement — reducing brake maintenance costs by an estimated 40% across the fleet.
★★★★★
"Even pad wear, no run-out. Brake maintenance costs down 40% across the fleet."
🇩🇰 Denmark — Wind Energy
A wind turbine manufacturer near Esbjerg integrated 55P couplings with 315×20 mm discs into the pitch drive assemblies of a multi-MW offshore platform. The compact integrated assembly reduced mass installed in the blade root, improving the blade structural weight budget, while the disc brake met IEC 61400-1 pitch system safety requirements for feathering in storm conditions.
★★★★★
"Mass budget and IEC certification both satisfied. Exactly what offshore pitch drives need."
Frequently Asked Questions
For applications where drum-type shoe brakes are specified rather than disc caliper brakes, review the Z Type Drum Brake Flexible Jaw Coupling, which provides an equivalent integrated coupling-and-drum solution for shoe brake actuators across the same torque range.
Need a P Type Coupling with Specific Disc and Bore Dimensions?
GBC supplies P Type disc brake flexible jaw couplings to crane manufacturers, hoist builders, mining equipment OEMs, and plant engineers throughout Australia and internationally. Provide your coupling torque, bore sizes, required brake disc diameter and thickness, and caliper model — our technical team will confirm the correct P Type specification within one business day.
The P Type Disc Brake Flexible Jaw Coupling integrates a precision brake disc into the coupling hub for use with disc brake caliper actuators. Torque range 190–6,650 N·m, brake disc diameters from 200 to 900 mm. Ideal for hoisting, positioning, and holding applications requiring combined drive torque transmission and positive braking in a compact assembly.
