Boston Gear 08304 Flexible Coupling Half Steel 3 Jaw

Product Description

The BOSTON GEAR 08304 is a steel flexible coupling half designed for power transmission applications in industrial and mechanical drive systems. This 3-jaw style half coupling accepts a 1.875-inch minimum bore diameter and a finished bore of 1.876 inches, making it suitable for precision shaft fitment. The part measures 6.32 inches in overall length with a 3.75-inch outside diameter and a 3.5-inch hub diameter. It is sized under the FC38 coupling size code. Licensed millwrights, maintenance mechanics, and industrial technicians typically install this component as part of a jaw-style flexible coupling assembly connecting motor and load shafts.

This coupling half is intended for use in industrial power transmission setups where shaft misalignment compensation and vibration damping are required. The 3-jaw design is common in pump, compressor, conveyor, and general machinery drive applications. The 1/2-inch keyway width and 1/2-13 thread size allow for secure shaft engagement. This part is sold individually and pairs with a matching coupling half and a center spider insert to form a complete flexible jaw coupling assembly.

Key Features

• 3-jaw flexible coupling half style for use with standard jaw coupling spider inserts
• Steel construction for durability in industrial drive environments
• 1.875-inch minimum bore diameter with a finished bore of 1.876 inches for precise shaft fit
• 1/2-inch keyway width with 1/2-13 thread size for secure shaft locking
• 3.75-inch outside diameter and 3.5-inch hub diameter for FC38 size coupling assemblies
• 2.69-inch bore depth allows for adequate shaft engagement length

Compatibility

Designed as an OEM-style replacement or standard component for industrial jaw-style flexible coupling assemblies using FC38-size coupling halves and compatible center spider inserts.

Installation Notes

Installation should be performed by a qualified millwright or mechanical technician. De-energize and lock out the drive system before removing or installing any coupling components, following applicable LOTO procedures. Ensure the shaft and bore are clean and free of burrs before pressing or sliding the coupling half into position. Do not overtighten set screws or fasteners beyond the specifications listed in the equipment service manual.