Accupro 8736942/0859780 Micro Drill Chuck Adapter Chuck

Product Description

The ACCUPRO 8736942/0859780 is a micro drill chuck adapter and chuck combination designed for precision drilling applications. It features a 1/2 inch straight shank for direct mounting into compatible drill presses, milling machines, or CNC spindles. The keyless chuck accepts drill bits from 1/64 inch up to 1/16 inch, making it suited for fine-detail work where small-diameter tooling is required. Weighing 3 pounds, this unit delivers a compact, secure grip on micro-diameter bits without the need for a chuck key. Machinists and tool and die technicians commonly specify this type of adapter when working with miniature drills on precision components.

This adapter and chuck assembly is used in machine shop environments where small-diameter drilling demands consistent runout control and reliable bit retention. Typical applications include PCB drilling, watchmaking fixtures, instrument manufacturing, and other precision machining tasks that require drill bit diameters at or below 1/16 inch. The straight shank design allows straightforward installation into standard 1/2 inch collet holders or drill spindles found on bench-top and floor-standing drill presses as well as milling machine quills.

Key Features

• Keyless chuck design allows fast bit changes without a separate chuck key
• Accepts micro drill bits from 1/64 inch to 1/16 inch capacity range
• 1/2 inch straight shank for broad compatibility with standard spindle holders
• Compact chuck profile suited for tight-clearance precision drilling setups
• Adapter and chuck sold as a single assembled unit

Compatibility

Designed as an OEM-style replacement or upgrade chuck adapter for drill presses, milling machines, and CNC spindles equipped with a 1/2 inch straight shank receptor.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine before removing or installing any chuck adapter. Verify that the spindle bore and shank diameter match before seating the adapter to avoid runout or damage to the spindle taper. Confirm bit retention torque by hand before initiating a test cycle at low speed.