Boneham SF488IB Slip-fixed Drill Bushing 0.29 in Id

Product Description

The BONEHAM SF488IB is a slip-fixed drill bushing designed to guide cutting tools with precision during drilling, reaming, or boring operations. Built to industry code SF, this bushing features a 0.29 inch inside diameter with a close tolerance of +0.0001 to +0.0005 inches, a 0.75 inch body outside diameter, and a 0.5 inch length under the head. The head outside diameter measures 1 and 3/64 inches with a head height of 0.25 inches. Constructed from steel, it is a renewable bushing secured with an LS-1 compatible lock screw. Machinists, toolmakers, and jig-and-fixture builders install this type of bushing as part of drill jig assemblies in production and repair environments.

This slip-fixed bushing is suited for applications where the bushing must be locked in position during the cutting operation but can be removed and replaced without disturbing the jig plate. The SF style is a standard in drill jig work across metalworking, manufacturing, and maintenance repair operations. The renewable design allows worn bushings to be swapped out quickly, keeping jig fixtures in service longer. Inside diameter letter designation is L, corresponding to the 0.29 inch decimal dimension, which accommodates standard drill bit shanks or guide pins of that size.

Key Features

• Slip-fixed SF bushing style — locks in place during drilling, removable without jig plate modification
• 0.29 inch inside diameter with precision tolerance of +0.0001 to +0.0005 inches for accurate tool guidance
• Steel construction for durability in repetitive production drilling applications
• Renewable bushing design allows field replacement without replacing the jig liner
• LS-1 compatible lock screw secures the bushing in the liner during operation
• Head style provides positive axial location against the jig plate surface

Compatibility

Designed for use with LS-1 series lock screws and standard drill jig liner assemblies that accept 0.75 inch body outside diameter slip-fixed bushings per SF industry standards.

Installation Notes

Installation is performed by toolmakers or machinist technicians familiar with drill jig assembly. The bushing slips into a compatible press-fit liner already installed in the jig plate and is secured with an LS-1 lock screw before drilling begins. Always verify that the liner bore and bushing body outside diameter are clean and free of chips or burrs before seating the bushing. Remove the lock screw and bushing before any jig plate rework or liner replacement.