Tb Woods TB-9S218 Sure-flex Coupling Flange Size 9

Product Description

The TB WOODS TB-9S218 is a Sure-Flex sleeve coupling flange designed for industrial power transmission applications. This Size 9 flange hub connects rotating shafts by mating with a flexible sleeve element to dampen shock loads and accommodate minor misalignment. Manufactured from cast iron, it features a round keyed bore of 2.125 inches and a length through bore of 2.406 inches. Maximum rated speed is 3,750 RPM and maximum torque capacity is 2,340 inch-pounds. Licensed HVAC, mechanical, and industrial technicians routinely spec this style of coupling in motor-to-load drive trains.

This flange hub is suited for use in a wide range of industrial and commercial drive applications. Common installations include compressors, conveyors, motors, and pumps where flexible coupling is required to protect connected equipment from vibration and torsional shock. The Sure-Flex design is a widely used flange-and-sleeve system in both new construction and replacement service across light and heavy industrial settings. No bushing is required for this bore configuration.

Key Features

• Size 9 flange hub rated to 3,750 RPM maximum speed
• Maximum torque rating of 2,340 inch-pounds
• Round keyed bore diameter of 2.125 inches with close bore tolerance of plus 0.0005 to plus 0.0020 inches
• Cast iron hub construction for durability in industrial environments
• Outside diameter of 6.344 inches and hub diameter of 3.625 inches
• Flange hub type — pairs with a Sure-Flex sleeve element, no bushing required

Compatibility

Designed as an OEM-style Sure-Flex replacement flange hub for Size 9 sleeve coupling assemblies used in compressor, conveyor, motor, and pump drive trains requiring a 2.125-inch round keyed bore.

Installation Notes

Installation should be performed by a qualified mechanical or industrial technician. Disconnect and lock out all power to the drive system before disassembling the existing coupling. Verify shaft and keyway dimensions against bore and tolerance specifications before pressing the hub onto the shaft. Ensure the mating sleeve element and opposing flange hub are inspected or replaced at the same service interval to maintain balanced coupling performance.

Technical Specifications

• Coupling Size: 9
• Hub Type: Flange Hub
• Maximum Speed: 3,750 RPM
• Maximum Torque: 2,340 inch-pounds
• Bore Diameter: 2.125 inches
• Bore Type: Round Keyed
• Bore Tolerance: plus 0.0005 inches / plus 0.0020 inches
• Outside Diameter: 6.344 inches
• Hub Diameter: 3.625 inches
• Length Through Bore: 2.406 inches
• Hub Body Length: 0.781 inches
• Hub Material: Cast Iron
• System of Measurement: Inch
• Country of Origin: Mexico

Standard Information

• Brand: TB WOODS
• Manufacturer Part Number: TB-9S218