Boneham SF4812IM Slip-fixed Drill Bushing 5/16 in Id Steel

Product Description

The BONEHAM SF4812IM is a slip-fixed drill bushing designed for precision jig and fixture applications in metalworking and machining environments. Manufactured from steel and hardened to 60 to 65 HRC, this bushing provides a renewable, wear-resistant guide for drill bits and other cutting tools. The inside diameter measures 0.3125 inches with a close tolerance of plus 0.0001 to plus 0.0005 inches, ensuring accurate, repeatable hole location. The body outside diameter is 0.7500 inches and the length under the head is 3/4 inch. Installation is slip-fixed, meaning the bushing can be removed and replaced without disturbing the liner bushing pressed into the jig plate.

This bushing is suited for use in drill jigs, fixture plates, and production tooling where consistent hole placement is required across multiple workpieces. The head-type design seats flush against the jig plate surface and is compatible with a standard LS-1 lock screw to secure the bushing during operation. Typical users include tool and die makers, machinists, and production floor personnel working in job shop and manufacturing environments. The renewable design allows worn bushings to be swapped out in the field without replacing the entire fixture assembly.

Key Features

• Slip-fixed installation for easy field replacement without disturbing liner bushing
• Steel construction hardened to 60 to 65 HRC for long service life in high-cycle drilling applications
• Inside diameter tolerance of plus 0.0001 to plus 0.0005 inches for precise tool guidance
• Head-type design with 1-3/64 inch head OD and 1/4 inch head height for positive seating on jig plate
• LS-1 lock screw compatible to prevent rotation or lift-out during drilling
• Renewable bushing design reduces fixture maintenance cost
• Meets ANSI standards for drill bushing dimensions and tolerancing

Compatibility

Designed as an ANSI-standard slip-fixed replacement bushing for use with standard liner bushings in drill jig and fixture plate applications. Compatible with LS-1 lock screws. Not counterbored.

Installation Notes

Installation is performed by machinists or tool and die makers familiar with jig fixture assembly. The liner bushing must already be pressed into the jig plate before the SF4812IM is inserted. Ensure the lock screw is engaged before beginning any drilling operation to prevent the bushing from rotating or pulling out under cutting forces. Inspect the liner bushing bore for wear or damage before installing a new slip-fixed bushing.