Boneham AM00000161 Drill Bushing Hm 4.75 Inch Id

Product Description

The BONEHAM AM00000161 is a press fit headless drill bushing with an HM industry code, designed to guide cutting tools accurately through jigs and fixtures in precision machining operations. Made from steel, this bushing presses directly into a hardened drill jig plate without a locking collar or head, providing a flush, low-profile installation. With an inside diameter of 4.75 inches and a body outside diameter of approximately 0.315 inches (8.00 mm), it is dimensioned to accept the corresponding drill or reamer shank while maintaining tight positional tolerances. Machinists and tool-and-die professionals install this type of bushing where repeatable hole location is critical.

This bushing is suited for use in production drilling, reaming, and boring fixtures in both job-shop and production manufacturing environments. The HM designation follows standard drill bushing industry coding, allowing direct cross-reference with compatible jig plate bore specifications. Its headless design makes it appropriate for close-clearance fixture layouts where a headed bushing would interfere with workpiece travel or clamping. The steel construction handles the cyclic wear loads typical of medium-to-high production runs.

Key Features

• Press fit installation — no collar or locking hardware required
• HM industry code — cross-references to standard jig boring specifications
• 4.75 inch inside diameter for precise tool guidance
• Steel construction for wear resistance under repeated drilling cycles
• Headless design enables flush, low-profile seating in the jig plate
• Non-renewable bushing — intended as a permanent press-in installation

Compatibility

Designed as an OEM-style replacement or new-installation press fit headless drill bushing for steel jig plates bored to the HM industry standard inside-diameter specification.

Installation Notes

Press fit bushings are installed by qualified machinists or toolmakers using an arbor press or hydraulic press; never drive with a hammer, as uneven force can distort the bore or crack the jig plate. The receiving jig plate bore must be finish-ground or reamed to the correct H7 or equivalent tolerance to achieve the specified press fit interference. Always deburr and clean the jig bore before pressing the bushing in. Once installed, this bushing is not designed for field removal and replacement — plan its position carefully before pressing.