Tb Woods TB-SF218 Sure-grip Qd Bushing 2.125 in Bore

Product Description

The TB Woods TB-SF218 is a Sure-Grip Quick-Detachable (QD) bushing in the SF series, designed for secure torque transmission in industrial mechanical drive systems. Featuring a 2.125-inch finished bore with a standard ANSI keyway, it accepts inch-series hardware and uses three 3/8-16 capscrews tightened to 30 in-lb installation torque. The cast-iron body delivers a rated torque capacity of 11,000 in-lb, making it well-suited for demanding power transmission applications. Licensed mechanical and industrial technicians install this bushing onto QD-bored sheaves, sprockets, and hubs in belt-drive and chain-drive assemblies.

The TB-SF218 fits into conveyor systems, pump drives, fan drives, compressor drives, and general industrial machinery where a reliable QD-style bushing connection is required. It supports both standard and reverse mounting orientations, providing installation flexibility when working with existing sheave or sprocket configurations. The SF series size designation indicates a specific bolt circle and dimensional envelope suited for mid-range shaft sizes and moderate-to-heavy torque loads in continuous-duty industrial settings.

Key Features

• 2.125-inch finished bore with standard ANSI keyway for positive key engagement
• Rated torque capacity of 11,000 in-lb for demanding drive applications
• Three 3/8-16 capscrews installed at 30 in-lb torque for consistent clamping force
• Supports standard (STD) and reverse (REV) mounting orientations
• 3.88-inch bolt circle for SF series dimensional compatibility
• Cast-iron construction for durability in industrial environments

Compatibility

Designed for use with QD-bored sheaves, sprockets, and hubs that accept the SF series bushing envelope. Fits any QD-style drive component machined to the SF series bolt pattern and bore profile.

Installation Notes

Installation should be performed by a qualified mechanical or industrial technician. De-energize and lock out all drive equipment before mounting or removing the bushing. Clean the bushing bore, shaft, and mating hub taper thoroughly before assembly, and apply a light oil or anti-seize to capscrew threads only, not the taper surfaces. Follow the alternating torque sequence for the three capscrews to achieve even seating, and verify shaft alignment before returning the drive to service.

Technical Specifications

• Series: SF (Sure-Grip QD)
• Bore: 2.125 inches
• Bolt Circle: 3.88 inches
• Keyway: Standard ANSI
• Number of Capscrews: 3
• Capscrew Size: 3/8-16
• Capscrew Length: 2 inches
• Hardware Series: Inch series
• Installation Torque: 30 in-lb
• Torque Capacity: 11,000 in-lb
• Mounting: Standard or Reverse
• Design Type: OD
• TBW Group No.: 11310

Standard Information

• Brand: TB Woods
• Manufacturer Part Number: TB-SF218