Value Collection SC90000308 Rotary Tool Holder Bushing

Product Description

The VALUE COLLECTION SC90000308 is a Type B rotary tool holder bushing used to locate and support cutting tools in drill jigs and tooling fixtures. With a 0.25 inch inside diameter and a 1 inch outside diameter, it seats precisely in a mating bushing liner or plate to guide twist drills, reamers, and similar tooling during machining operations. The head thickness of 0.265 inches provides a positive stop against the jig plate surface. The length under the head measures 1.75 inches, giving ample engagement depth for medium-thickness workholding setups. Machinists, tool and die makers, and fixture builders install this component during jig assembly and tooling maintenance.

This Type B bushing is suited for use in drill jig fixtures across production machining, job shop, and maintenance repair environments. Type B bushings are designed to be used with a liner bushing pressed into the jig plate, allowing the tool holder bushing to be rotated and removed for tool changes without disturbing the plate. This design is common in repetitive-hole operations where tooling must be swapped between drill and reamer operations at the same station.

Key Features

• Type B configuration allows removal and rotation within a fixed liner bushing for quick tool changes
• 0.25 inch inside diameter accommodates standard 1/4 inch shank tooling
• 1 inch outside diameter for use with corresponding liner bushings
• 1.75 inch length under head provides solid engagement in medium-thickness jig plates
• 0.265 inch head thickness acts as a positive stop against the jig plate surface

Compatibility

Designed as an OEM-style replacement or production-use component for standard Type B rotary tool holder bushing applications requiring a 1/4 inch inside diameter, 1 inch outside diameter, and 1-3/4 inch length under head.

Installation Notes

Installation is typically performed by a machinist or tooling technician during jig plate assembly or tooling changeover. The mating liner bushing must already be pressed and secured in the jig plate before this bushing is inserted. Ensure the locking mechanism or thumb screw on the jig head is disengaged before rotating or removing the bushing. Follow shop safety procedures and de-energize any associated machine before servicing tooling fixtures.