Description
GT10 GT Type Sleeve Coupling – 140–200mm Bore Rigid Muff Coupling for Zero-Backlash Shaft Connection
The GT10 GT type sleeve coupling — also known as a muff coupling — is the simplest and most direct form of rigid shaft coupling: a single cylindrical steel body with a through bore machined to receive two co-linear shaft ends, transmitting torque through keyway and fitted key engagement on each shaft side. At 380 mm outer diameter and 762 mm overall length, the GT10 provides a compact, maintenance-free rigid connection for 140–200 mm shaft diameters, rated at 100000 N·m nominal torque at up to 1400 rpm maximum speed. The largest model in the GT series, the GT10 at 100,000 N·m covers 140–200 mm shaft connections at the extreme end of sleeve coupling applications. Primary ball mill drives, large mine hoisting equipment, and major power station auxiliary drives define its application territory.
The operating principle of the GT sleeve coupling is direct and reliable. Each shaft end is inserted into one half of the sleeve bore. A fitted key is placed in the matching keyways of both the shaft and the sleeve bore on each side — two keys total, typically positioned 180° apart. When the coupling rotates, torque is transmitted from the driving shaft to the sleeve through key-keyway bearing contact, and from the sleeve to the driven shaft through the same mechanism on the opposite side. There are no flexible elements, no preloaded fasteners to maintain, and no wear surfaces subject to degradation under normal operating conditions. The result is a permanent, zero-backlash connection that requires essentially no maintenance throughout its service life, provided the connected shafts remain accurately aligned.
The H7 bore tolerance and GB3852-1997 keyway standard ensure dimensional compatibility with standard motor and driven equipment shaft ends throughout the GT series. For special shaft configurations — non-standard diameters, tapered bores, or hydraulic fit bores — custom machining is available. The complete GT series, from GT1 through GT10, is listed on our product catalog page.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | GT10 |
| Type | GT Type Sleeve Coupling (Muff Coupling) |
| Bore Range (d) | 140–200 mm |
| Outer Diameter (D) | 380 mm |
| Overall Length (L) | 762 mm |
| Nominal Torque (Tn) | 100000 N·m |
| Maximum Speed [n] | 1400 rpm |
| Bore Tolerance | H7 standard |
| Keyway Standard | GB3852-1997 |
| Mass | 475 kg |
Dimension Reference
Construction and Functional Features
The GT10 body is machined from high-quality cast iron or cast steel — material selection dependent on model size and rated torque. The bore is machined to H7 tolerance to provide a controlled fit against the shaft end, complementing the key-keyway torque transmission with a stable radial contact between shaft and bore. The outer diameter is machined concentric with the bore to ensure rotational balance. Keyway slots are machined to GB3852-1997 standard dimensions for the specified bore size — verifying compatibility with standard motor shaft keyways without modification.
Zero Backlash
Rigid key-keyway torque transmission with no play or compliance — every angular increment on the driving shaft is replicated exactly on the driven shaft. Essential for phase-critical and encoder feedback applications.
Maintenance-Free Service Life
No wear elements, no elastomeric components to degrade, no bolts to retorque. Once correctly installed on aligned shafts, the GT sleeve coupling requires no maintenance throughout its service life.
Compact One-Piece Design
Single cylindrical body — no bolted flanges, no split halves, no external fasteners. Lowest-profile rigid coupling available for co-linear shaft connections, minimising guard size and axial space requirements.
Standard Keyway Compatibility
Bore and keyway dimensions to GB3852-1997 and H7 bore tolerance ensure direct compatibility with standard motor and driven equipment shaft ends throughout the industrial motor range.
Manufacturing Quality
Typical Applications
- Conveyor drive head shaft connections — sustained torque, continuous duty, minimal maintenance
- Compressor motor shaft connections — direct motor to crankshaft coupling with zero torsional play
- Wood processing machinery shaft connections — saw arbor and feed roll rigid drive coupling
- Textile machinery main shaft connections — loom main drive and roller feed rigid coupling
For technical enquiries and volume supply information, visit our contact page.
Customer Reviews and Case Studies
★★★★★
Germany — Large Mining Equipment OEM
The GT10 is our largest sleeve coupling application — connecting 140–200 mm motor shafts to primary conveyor drive gearboxes at our major mining equipment installations. At 100,000 N·m rated torque, the rigid steel sleeve provides the high-integrity connection required for our critical drive equipment.
— Chief Engineer, Düsseldorf
★★★★★
Australia — Mine Site Operations
GT10 sleeve couplings are installed on primary ball mill motor connections at our iron ore processing facility. The coupling’s 762 mm length and 380 mm OD provide the structural integrity needed for our 200 mm motor shaft connections at full rated torque.
— Rotating Equipment Superintendent, Perth
★★★★☆
United States — Heavy Industrial Drive OEM
We supply GT10 sleeve couplings for the largest shaft connections in our industrial drive equipment range. The one-piece steel body eliminates the alignment and bolt preload management complexity of multi-piece coupling designs at this extreme torque level.
— Vice President Engineering, Houston
Frequently Asked Questions
What makes the GT10 suitable for 100,000 N·m torque applications?
The GT10’s solid steel body (380 mm OD, 762 mm length, 475 kg) provides the wall section and key engagement length needed for 100,000 N·m torque transmission at 140–200 mm bore diameters. At this torque level, the key-keyway contact stress, sleeve body bending strength, and shaft surface integrity are all design constraints that the GT10’s geometry addresses simultaneously.
How many people and what equipment are needed for GT10 installation?
GT10 installation requires a minimum of 4 trained personnel, a crane with at least 2-tonne capacity, a hydraulic induction heater or large oven for sleeve preheating (150–200°C), precision laser alignment equipment, and a calibrated hydraulic torque wrench. The operation should be covered by a formal installation procedure document.
What shaft material is recommended with GT10 for 100,000 N·m torque?
For 100,000 N·m applications, alloy steel shafts to 42CrMo4 or equivalent (yield strength ≥ 750 MPa) are recommended. Carbon steel C45 shafts may be suitable depending on the key bearing stress calculation — verify with your shaft design engineer using the actual key dimensions and shaft geometry.
Is the GT10 available with hydraulic shrink-fit bore (oil injection bore)?
Yes. For very large interference fits at 140–200 mm bore diameter, a hydraulic shrink-fit bore with oil grooves and pressurisation port can be machined on request. This allows the sleeve to be installed and removed without heating, using hydraulic oil injection to relieve the interference. Specify this requirement when enquiring.
What is the expected service life of a GT10 sleeve coupling under rated conditions?
A properly installed and aligned GT10 operating within its rated torque and speed limits has essentially unlimited fatigue life — there are no wear elements in a rigid sleeve coupling. The limiting life factors are: corrosion of the shaft-bore contact interface, fretting wear under high-cycle vibration, and keyway fatigue under sustained torque reversal. Regular inspection of shaft and keyway surfaces at planned maintenance intervals is recommended.
Source the GT10 GT Sleeve Coupling
Ever Power manufactures the GT10 and the complete GT sleeve coupling series — GT1 through GT10, covering 12 mm to 200 mm bore — direct from our factory. Specify bore diameters, keyway requirements, and any non-standard dimensions for a prompt technical and commercial response.