Boneham SFT286HB Slip-fixed Drill Bushing 0.242 in Steel

Product Description

The BONEHAM SFT286HB is a slip-fixed drill bushing designed to guide cutting tools with precision during drilling, reaming, and similar machining operations. It carries an industry code of SF and features a 0.242 inch inside diameter (Letter C) with an inside diameter tolerance of +0.0001 to +0.0004 inches, making it suitable for close-tolerance tooling work. The body outside diameter measures 7/16 inch (0.4375 inches) and the length under the head is 3/8 inch. Constructed from steel, this bushing is a headed, renewable style, meaning it can be removed and replaced without disturbing the liner bushing installed in the jig plate. It is compatible with the LS-TW-2 lock screw for secure retention during operation.

This bushing is used in drill jig applications across toolroom, production machining, and fixture fabrication environments. It seats into a liner bushing already pressed into a jig plate, allowing fast changeout between different tool sizes on the same fixture. The headed design provides a positive stop against the jig surface and resists axial pull-out under cutting load. Typical users include machinists, tool and die makers, and fixture builders working in manufacturing, metal fabrication, and precision machine shops.

Key Features

• Slip-fixed installation method for tool-free removal and replacement in liner bushings
• 0.242 inch inside diameter (Letter C) with tight tolerance of +0.0001 to +0.0004 inches
• Steel construction for hardness and wear resistance in production drilling applications
• Headed design with 5/8 inch head outside diameter and 1/4 inch head height for positive axial location
• Compatible with LS-TW-2 lock screw to prevent rotation and axial movement during use
• Renewable bushing design allows replacement without disturbing the liner bushing in the jig plate

Compatibility

Designed for use with LS-TW-2 compatible lock screws and standard liner bushings accepting a 7/16 inch body outside diameter slip-fixed bushing per SF industry standards.

Installation Notes

Installation and removal of slip-fixed bushings is performed by toolroom machinists or fixture technicians. Ensure the mating liner bushing and jig plate assembly are clean and free of chips or debris before seating the bushing. The lock screw should be engaged to prevent the bushing from rotating or lifting during the cutting operation. Always verify the bushing bore is aligned with the jig plate hole before applying cutting force.