Collis Tool 85511 Type C Tool Holder Bushing 5/16 Id 1 Od

Product Description

The COLLIS TOOL 85511 is a Type C rotary tool holder bushing designed to locate and support cutting tools within drill jigs, tooling plates, and precision fixtures. With a 5/16-inch (0.3125-inch) inside diameter and a 1-inch (1.0000-inch) outside diameter, it provides accurate tool guidance during drilling, reaming, and boring operations. The slotted body measures 2-3/4 inches under the head, with a 2-3/8-inch slot length that allows chips and coolant to clear during operation. The head thickness is 3/16 inch (0.1875 inch). This type of bushing is a standard consumable in machine shops, tool rooms, and production environments where repeatable hole location is required.

Type C tool holder bushings are used in fixture-based machining setups across light manufacturing, job shops, and production lines. The slotted design suits applications where chip clearance is a priority, such as deep-hole drilling or through-coolant operations. This bushing fits into standard jig bushing liners that accept a 1-inch outside diameter Type C configuration. Machinists, toolmakers, and fixture builders select this size for smallbore work requiring 5/16-inch tool guidance.

Key Features

• Type C slotted bushing design allows chip and coolant clearance during operation
• 5/16-inch inside diameter (0.3125 inch) for precise small-bore tool guidance
• 1-inch outside diameter (1.0000 inch) fits standard Type C liner configurations
• 2-3/4-inch length under head provides extended tool support in deep fixture applications
• 2-3/8-inch slot length for maximum chip relief along the working body
• 3/16-inch head thickness for low-profile seating in fixture plates

Compatibility

Designed as an OEM-style replacement for standard Type C rotary tool holder bushing applications requiring a 1-inch outside diameter and 5/16-inch inside diameter in drill jig and fixture setups.

Installation Notes

Installation is performed by toolmakers or machinists during fixture assembly or bushing replacement. Ensure the mating liner is clean and free of burrs before pressing or inserting the bushing. De-energize and lock out any machine before servicing tooling or replacing bushings in an active fixture. Do not force the bushing if resistance is encountered - verify liner inside diameter and bushing outside diameter tolerances before installation.