{"id":3572,"date":"2026-07-08T08:32:11","date_gmt":"2026-07-08T08:32:11","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/gt8-gt-type-sleeve-coupling-90-125mm-bore-rigid-muff-coupling-for-co-linear-shaft-connections\/"},"modified":"2026-07-08T08:32:16","modified_gmt":"2026-07-08T08:32:16","slug":"gt8-gt-type-sleeve-coupling-90-125mm-bore-rigid-muff-coupling-for-co-linear-shaft-connections","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/th\/product\/gt8-gt-type-sleeve-coupling-90-125mm-bore-rigid-muff-coupling-for-co-linear-shaft-connections\/","title":{"rendered":"GT8 GT Type Sleeve Coupling \u2013 90\u2013125mm Bore Rigid Muff Coupling for Co-Linear Shaft Connections"},"content":{"rendered":"
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GT8 GT Type Sleeve Coupling \u2013 90\u2013125mm Bore Rigid Muff Coupling for Zero-Backlash Shaft Connection<\/h1>\n

The GT8 GT type sleeve coupling<\/strong> \u2014 also known as a muff coupling \u2014 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 240 mm outer diameter and 482 mm overall length, the GT8 provides a compact, maintenance-free rigid connection for 90\u2013125 mm shaft diameters, rated at 16000 N\u00b7m nominal torque at up to 2240 rpm maximum speed. At 16,000 N\u00b7m and 90\u2013125 mm bore, the GT8 serves the largest directly coupled industrial drive applications. The one-piece steel body at 117 kg provides a structurally robust rigid connection for large pump, fan, and gearbox input shaft connections in the 500 kW\u20131 MW power range.<\/p>\n

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 \u2014 two keys total, typically positioned 180\u00b0 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.<\/p>\n

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 \u2014 non-standard diameters, tapered bores, or hydraulic fit bores \u2014 custom machining is available. The complete GT series, from GT1 through GT10, is listed on our product catalog page<\/a>.<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nGT8<\/td>\n<\/tr>\n
Type<\/td>\nGT Type Sleeve Coupling (Muff Coupling)<\/td>\n<\/tr>\n
Bore Range (d)<\/td>\n90\u2013125 mm<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n240 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n482 mm<\/td>\n<\/tr>\n
Nominal Torque (Tn)<\/td>\n16000 N\u00b7m<\/td>\n<\/tr>\n
Maximum Speed [n]<\/td>\n2240 rpm<\/td>\n<\/tr>\n
Bore Tolerance<\/td>\nH7 standard<\/td>\n<\/tr>\n
Keyway Standard<\/td>\nGB3852-1997<\/td>\n<\/tr>\n
Mass<\/td>\n117 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimension Reference<\/h2>\n

\"GT8<\/p>\n

Construction and Functional Features<\/h2>\n

\"GT8<\/p>\n

The GT8 body is machined from high-quality cast iron or cast steel \u2014 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 \u2014 verifying compatibility with standard motor shaft keyways without modification.<\/p>\n

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Zero Backlash<\/h3>\n

Rigid key-keyway torque transmission with no play or compliance \u2014 every angular increment on the driving shaft is replicated exactly on the driven shaft. Essential for phase-critical and encoder feedback applications.<\/p>\n<\/div>\n

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Maintenance-Free Service Life<\/h3>\n

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.<\/p>\n<\/div>\n

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Compact One-Piece Design<\/h3>\n

Single cylindrical body \u2014 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.<\/p>\n<\/div>\n

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Standard Keyway Compatibility<\/h3>\n

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.<\/p>\n<\/div>\n<\/div>\n

Manufacturing Quality<\/h2>\n

\"Ever<\/p>\n

Typical Applications<\/h2>\n