Global Cnc Industries 8602J .312 Tool Holder Bushing Type J

Product Description

The GLOBAL CNC INDUSTRIES 8602J .312 is a Type J rotary tool holder bushing designed for use in drill jigs, tooling fixtures, and precision machining setups. With a 5/16 inch (0.3125 inch) inside diameter and a 1 inch outside diameter, this bushing guides cutting tools accurately and reduces wear on tooling fixtures. The head thickness measures 0.265 inches, and the length under the head is 1-3/4 inches (1.7500 inches). Machinists, toolmakers, and fixture builders install this type of bushing where repeatable hole location accuracy is required in production or job-shop environments.

Type J bushings are commonly used in drill jig applications where a renewable liner bushing is already installed in the fixture plate. This bushing press-fits or slips into the liner, depending on the application, and is used with standard drill, reamer, or counterbore tooling that matches the 5/16 inch bore. It is suited for both light-production and high-volume drilling operations where consistent hole placement is critical. The distance between hole centers is 7/8 inch, and the D-in dimension is 7/16 inch, making it compatible with standard jig plate layouts.

Key Features

• Type J bushing configuration for use with renewable liner bushings in drill jig fixtures
• 0.3125 inch inside diameter for precise tool guidance with 5/16 inch tooling
• 1.0000 inch outside diameter for consistent fit in standard liner bushings
• 1.7500 inch length under head provides adequate tool guidance depth
• 0.265 inch head thickness seats flush and secure against fixture surfaces
• 7/8 inch distance between hole centers suits standard jig plate layouts

Compatibility

Designed as a replacement or spare Type J rotary tool holder bushing for use in drill jig fixtures equipped with standard renewable liner bushings accepting a 1 inch outside diameter insert.

Installation Notes

Installation is typically performed by toolmakers or machinists during fixture setup or maintenance. Ensure the mating liner bushing bore and the fixture plate are clean and free of chips or burrs before inserting the bushing. Do not force or hammer the bushing into position in a way that distorts the bore; use appropriate press equipment or hand pressure as the fit class requires. Verify tool clearance and bushing seating before resuming production operations.