Boneham SFT288HU Slip-fixed Drill Bushing 0.277 in Steel

Product Description

The BONEHAM SFT288HU is a slip-fixed drill bushing designed to guide cutting tools with precision during drilling, reaming, and boring operations. Built to industry code SF, it features a 0.277 inch inside diameter (Letter J) with a tight tolerance of +0.0001 to +0.0005 inches, ensuring consistent hole location and minimal tool deflection. The body outside diameter measures 0.4375 inches (7/16 inch) and the length under head is 0.5 inches (1/2 inch). Constructed from steel, this bushing is renewable and includes a head with a 5/8 inch outside diameter and 1/4 inch head height. It is compatible with the LS-TW-2 lock screw for secure positioning in the jig plate.

This bushing is suited for use in drill jigs and fixture plates in production machining, metal fabrication, and toolroom environments. The slip-fixed design allows the bushing to be installed and locked into a liner bushing already pressed into the jig plate, making it a common choice for operations requiring tool changes between drilling and reaming on the same hole location. Machinists, tool and die makers, and fixture builders working in manufacturing or job shop settings will find this bushing appropriate for a wide range of close-tolerance applications.

Key Features

• SF industry code slip-fixed design for use with pressed liner bushings
• Inside diameter 0.277 inches (Letter J) with tolerance of +0.0001 to +0.0005 inches for precise tool guidance
• Steel construction for durability in production machining environments
• Renewable bushing — can be removed and replaced without disturbing the jig plate
• LS-TW-2 lock screw compatible for secure, rotation-resistant seating
• Head type with 5/8 inch head OD and 1/4 inch head height for positive axial positioning

Compatibility

Compatible with LS-TW-2 lock screws. Designed for use with standard SF-style liner bushings in drill jigs and fixture plates. No specific machine or system models were identified in the product data.

Installation Notes

Installation is performed by machinists or toolroom technicians. The slip-fixed bushing is inserted into a mating liner bushing already seated in the jig plate and locked in place with the appropriate LS-TW-2 lock screw. Ensure the jig plate and liner bushing are clean and free of chips or debris before installation. Verify inside diameter tolerance requirements against the tool shank size before fitting to avoid improper guidance or excessive wear.