Boneham SF208EX Slip-fixed Drill Bushing 0.159 in Id Steel

Product Description

The BONEHAM SF208EX is a slip-fixed drill bushing designed to guide cutting tools with repeatable precision in jig and fixture applications. Built to the SF industry code, it features a 0.159 inch inside diameter (wire size 21) with a tight tolerance of +0.0001 to +0.0004 inches, a 5/16 inch body outside diameter, and a 1/2 inch length under the head. The body is machined from steel and hardened to 60 to 65 HRC, providing wear resistance suited to production drilling, reaming, and boring operations. A renewable design allows the bushing to be replaced without disturbing the jig body. Machinists, tool and die makers, and precision fabricators install this type of component.

The SF208EX is used in drill jig assemblies where a headed, slip-in bushing must be held in place by a lock screw rather than a press fit. This makes it well suited for setups that require frequent bushing changes between operations or when multiple drill sizes are used in the same jig location. Typical environments include production machine shops, aerospace fabrication, and precision metalworking operations where ANSI-standard tooling is specified.

Key Features

• Slip-fixed installation method for tool-free bushing changes in renewable jig liners
• Inside diameter tolerance of +0.0001 to +0.0004 inches for consistent tool guidance
• Steel construction hardened to 60 to 65 HRC for extended service life
• Head type design with 35/64 inch head outside diameter and 1/4 inch head height
• LS-1 compatible lock screw secures the bushing in the jig liner during drilling
• Renewable bushing design allows individual replacement without jig plate rework
• Meets ANSI standards for drill bushing dimensions and tolerances

Compatibility

Designed for use with LS-1 lock screws and compatible renewable bushing liners following ANSI slip-fixed bushing standards. Fits jig plates machined to accept a 5/16 inch body outside diameter SF-style renewable liner.

Installation Notes

Installation is performed by machinists or tool and die makers during jig assembly or bushing replacement. The jig assembly must be secured and cutting tools must be clear before inserting or removing the bushing. Ensure the renewable liner bore and the bushing body are clean and free of chips before seating. Secure the bushing with the appropriate LS-1 lock screw to prevent rotation during operation.