Accupro SPS1308500MSC R8 Keyless Drill Chuck 1/2 in

Product Description

The ACCUPRO SPS1308500MSC is a keyless drill chuck designed for milling machines and machining centers that accept an R8 spindle taper. It features an integral shank mount, eliminating the need for a separate arbor and reducing runout risk at the spindle interface. The chuck accepts tooling from 1/32 inch up to 1/2 inch in diameter and delivers a maximum TIR of 0.0016 inches, making it suitable for precision drilling and light boring operations. Ball bearing construction supports smooth, consistent clamping force across the capacity range. Rated to 10,000 RPM, this chuck suits both production and toolroom environments where speed and accuracy are required.

This chuck is intended for vertical milling machines equipped with an R8 spindle, the most common spindle standard found in Bridgeport-style knee mills and comparable manual or CNC knee-mill platforms. It is installed directly into the spindle taper without an intermediate arbor, making it a compact solution for shops that drill frequently from the mill table. Machinists, tool and die makers, and general machine shop technicians are the primary installers. The 1.89-inch sleeve diameter fits within the clearance envelope of standard R8 machines.

Key Features

• Keyless chuck design allows fast, tool-free bit changes at the machine
• Integral R8 shank mounts directly to spindle taper — no separate arbor required
• Capacity range of 1/32 inch to 1/2 inch covers common drill and reamer sizes
• Maximum TIR of 0.0016 inches supports precision drilling applications
• Ball bearing construction provides consistent clamping and smooth operation
• 10,000 RPM maximum speed rating suits production drilling cycles

Compatibility

Designed for milling machines with an R8 spindle taper. Fits standard R8 spindle bores found on Bridgeport-style knee mills and similar manual or CNC vertical milling platforms.

Installation Notes

Installation and removal should be performed by a qualified machinist with the machine powered off and the spindle fully stopped. The R8 taper and spindle bore should be cleaned and inspected for burrs or debris before seating the chuck. A drawbar of the correct thread specification for the machine must be used to secure the integral shank; never operate the chuck without the drawbar fully tightened. Follow the machine manufacturer's spindle speed guidelines and do not exceed the chuck's rated RPM.