Boneham SF328IM Slip-fixed Drill Bushing 5/16 in Id Steel

Product Description

The BONEHAM SF328IM is a slip-fixed drill bushing designed to guide cutting tools with precision in jig and fixture applications. Built to the SF industry code and conforming to ANSI standards, this bushing features a 0.3125 inch (5/16 inch) inside diameter with a close tolerance of +0.0001 to +0.0005 inches, ensuring accurate tool guidance and repeatable hole location. The body outside diameter is 0.500 inch (1/2 inch), and the bushing is constructed from steel hardened to 60 to 65 HRC for long service life in production environments. Machinists, toolmakers, and fixture builders install this type of bushing in drill jigs where the bushing must be removed and replaced during multi-operation sequences.

The SF328IM is suited for production drilling, reaming, and boring operations in both shop and manufacturing environments. The slip-fixed design allows the bushing to be installed into a liner bushing and locked in position with an LS-1 compatible lock screw, preventing rotation or lifting during tool operation. It is renewable, meaning it can be swapped out independently of the liner bushing when wear occurs, reducing fixture maintenance costs. This part is appropriate for any application requiring a headed, slip-fixed renewable bushing per ANSI jig bushing standards.

Key Features

• SF industry code slip-fixed design for use with liner bushings and LS-1 lock screw
• Inside diameter of 5/16 inch (0.3125 inch) with +0.0001 to +0.0005 inch tolerance for precision tool guidance
• Body outside diameter of 1/2 inch (0.500 inch), length under head of 1/2 inch
• Steel construction hardened to 60 to 65 HRC for wear resistance in high-cycle applications
• Head outside diameter of 51/64 inch, head height of 1/4 inch
• Renewable bushing — replaceable without disturbing the liner bushing in the jig plate
• ANSI compliant; not counterbored

Compatibility

Designed for use with LS-1 compatible lock screws in standard ANSI slip-fixed liner bushing assemblies. Fits drill jig fixtures requiring a headed SF-type renewable bushing with a 1/2 inch body outside diameter.

Installation Notes

Installation is typically performed by toolmakers or machinists during fixture assembly or bushing replacement. The jig plate and any associated machinery should be fully powered down and secured before removing or seating bushings. The LS-1 lock screw must be engaged properly to prevent the bushing from rotating or pulling out under thrust load. Do not force the bushing into the liner with impact tools, as this may damage the ground bore or alter the tolerance fit.