Boneham SF4812JQ Slip-fixed Drill Bushing 3/8 in Id Steel

Product Description

The BONEHAM SF4812JQ is a slip-fixed drill bushing designed to guide cutting tools with precision in jig and fixture applications. Manufactured from steel with a hardness of 60 to 65 HRC, this bushing provides consistent bore alignment and wear resistance in production drilling operations. The inside diameter measures 0.375 inches with a tight tolerance of +0.0001 to +0.0005 inches, ensuring accurate tool guidance. The body outside diameter is 0.750 inches, and the length under the head is 0.750 inches. A head outside diameter of 1-3/64 inches and a head height of 0.250 inches keep the bushing seated securely in the liner. Compatible with an LS-1 lock screw, it is the SF industry code style. Machinists, tool-and-die makers, and fixture builders typically install this component.

This bushing is suited for use in renewable drill jig assemblies where tooling must be swapped between operations without replacing the liner bushing. The slip-fixed design allows the bushing to be installed and locked in place via the LS-1 lock screw, then removed when the operation changes. Typical applications include production drilling, reaming, and light boring in metalworking jigs. The renewable construction reduces fixture downtime and keeps tooling aligned across repeated setups in both low-volume and high-volume machining environments.

Key Features

• Steel construction hardened to 60 to 65 HRC for long service life in production drilling fixtures
• Inside diameter tolerance of +0.0001 to +0.0005 inches for precise tool guidance
• Slip-fixed (SF) installation method with LS-1 lock screw compatibility
• Renewable bushing design allows replacement without disturbing the liner or jig body
• Head style seating with 1-3/64 inch head OD and 0.250 inch head height for positive registration
• Meets ANSI standards for drill bushing geometry and dimensional tolerances

Compatibility

Designed for use in standard renewable drill jig liner systems that accept SF-series slip-fixed bushings and LS-1 lock screws per ANSI specifications.

Installation Notes

Installation is performed by machinists or tool-and-die technicians using appropriate press-fit or hand-seating methods into a compatible liner bushing. Ensure the jig or fixture is secured and all rotating machinery is powered down before servicing bushings. The LS-1 lock screw must be torqued per shop standards to prevent rotation during the cutting operation. Do not force an oversized cutting tool through the bushing, as this will damage the precision bore.