TB Wood's SK78 41D904 Bushing

Description:

The TB Wood's SK78 41D904 Bushing is used in industrial power transmission systems to securely mount sheaves, sprockets, pulleys, and couplings onto keyed shafts while providing reliable torque transmission and precise shaft alignment. Commonly installed in conveyors, pumps, compressors, fans, mixers, crushers, and other industrial machinery. Maintenance teams, OEMs, and system integrators use this quick detachable bushing for equipment replacement, drive system maintenance, machinery retrofits, and new power transmission installations.

Applications:

The TB Wood's SK78 41D904 Bushing is commonly used in industrial automation environments including conveyor systems, mining equipment, aggregate processing plants, material handling machinery, HVAC equipment, agricultural machinery, and manufacturing production lines where secure shaft mounting, accurate component alignment, and dependable torque transmission are essential. Its Sure-Grip® Quick Detachable (QD) design provides rapid installation, easy removal, and a true clamp fit for demanding industrial power transmission applications.

Technical Specifications:

• Manufacturer: TB Wood's (Regal Rexnord)
• Model / Part Number: SK78 (41D904)
• Product Type: Quick Detachable (QD) Bushing
• Bushing Series: Sure-Grip® SK Series
• Bushing Type: Standard QD Bushing
• Bore Diameter: 7/8 in.
• Bore Type: Finished Bore with Standard Keyway
• Keyway Size: 3/16 × 3/32 in.
• Material: Steel
• Flange Type: Split
• Flange Outside Diameter: 3.875 in.
• Barrel Diameter: 2.813 in.
• Overall Length (Length Through Bore): 1.875 in.
• Length Less Flange: 1.375 in.
• Flange Thickness: 1/2 in.
• Bolt Circle Diameter: 3.31 in.
• Number of Cap Screws: 3
• Cap Screw Size: 5/16-18 × 2 in. (SAE Grade 5)
• Installation Torque: 15 ft-lb
• Torque Capacity: 7,000 in-lb
• Taper: 3/4 in. per ft. on diameter
• Mounting Style: Conventional or Reverse Mounting
• Includes: (3) Cap Screws
• Application Environment: Industrial power transmission systems

Common Replacements:

• TB Wood's SK78
• Martin SK7/8
• Browning SK7/8