Boneham PT3612IU Headless Drill Bushing 21/64 in Id Steel

Product Description

The BONEHAM PT3612IU is a press fit headless drill bushing manufactured from steel and hardened to 60 to 65 HRC for long service life in precision drilling applications. With an inside diameter of 21/64 inches, a body outside diameter of 9/16 inches, and an overall length of 3/4 inches, this bushing guides drill bits, reamers, and other cutting tools with consistent accuracy. It conforms to ANSI standards and carries a P industry code designation. Machinists, toolmakers, and fixture builders install this type of bushing in drill jigs to maintain hole location and perpendicularity across repeated operations.

This bushing is suited for use in production and prototype drill jigs where a permanent, non-renewable bushing is appropriate. The headless design sits flush with the jig plate surface, making it a common choice when clearance above the jig is limited or when a low-profile installation is required. The press fit installation method holds the bushing securely in the jig liner hole without additional fasteners, supporting high-volume drilling cycles in both job shop and production environments.

Key Features

• Inside diameter of 21/64 inches with a tight tolerance of +0.0001 to +0.0005 inches for accurate tool guidance
• Hardened steel construction at 60 to 65 HRC resists wear from repeated drilling cycles
• Headless design provides a flush, low-profile fit within the jig plate
• Press fit installation method secures the bushing without additional hardware
• Meets ANSI standards for drill bushing geometry and dimensioning
• Non-renewable fixed bushing — intended for permanent installation in the jig body

Compatibility

Designed as an OEM-style replacement or new-installation drill bushing for steel drill jig plates requiring a press fit, headless configuration with a P industry code designation per ANSI standards.

Installation Notes

Installation is performed by toolmakers or machinist personnel using a drill press or arbor press to drive the bushing into a properly sized liner hole in the jig plate. The receiving hole should be sized and finished to achieve the correct interference fit before pressing the bushing in place. Do not use a hammer directly on the bushing face, as this can damage the precision bore or cause misalignment. Verify the inside diameter is clear of chips or debris before use.