Boneham SF4812ID Slip-fixed Drill Bushing 0.295 in Id Steel

Product Description

The BONEHAM SF4812ID is a slip-fixed drill bushing designed to guide cutting tools accurately during drilling, reaming, and boring operations in jig and fixture applications. Built to ANSI standards, this bushing features an inside diameter of 0.295 inches (letter size M) with a tight tolerance of +0.0001 to +0.0005 inches, ensuring precise tool guidance and repeatable hole location. The body outside diameter measures 0.75 inches with a length under the head of 0.75 inches. Constructed from steel hardened to 60 to 65 HRC, it delivers the wear resistance required for high-volume production environments. A licensed machinist or toolmaker installs this bushing into a drill jig liner or plate as part of a precision machining setup.

This bushing is suited for use in drill jigs across manufacturing, metalworking, and machine shop environments. The slip-fixed configuration allows the bushing to be installed and locked in place using a compatible LS-1 lock screw, making it appropriate for single-operation setups where the bushing remains fixed during the drilling cycle. The head style provides a positive stop against the jig plate surface, maintaining consistent drill depth and alignment. It is a renewable bushing, meaning it can be replaced independently without replacing the jig liner, reducing tooling maintenance costs in production settings.

Key Features

• Inside diameter of 0.295 inches (letter size M) with tolerance of +0.0001 to +0.0005 inches for precise tool guidance
• Steel construction hardened to 60 to 65 HRC for extended wear life
• Slip-fixed design compatible with LS-1 lock screw for secure, removable installation
• Head outside diameter of 1-3/64 inches and head height of 0.25 inches for positive jig plate seating
• Renewable bushing construction allows individual replacement without liner removal
• Meets ANSI standards for drill bushing dimensions and performance

Compatibility

Compatible with LS-1 lock screws. Designed as an ANSI-standard slip-fixed drill bushing for use with standard drill jig liners accepting a 0.75-inch body outside diameter bushing.

Installation Notes

Installation is performed by a machinist or toolmaker as part of jig and fixture assembly. Ensure the jig liner bore is clean and dimensionally correct before pressing the bushing into position. Secure with a compatible LS-1 lock screw and verify the bushing seats flush against the jig plate surface. Do not force an oversized bushing into an undersized liner, as this can distort the inside diameter and compromise tool guidance accuracy.