Jacobs 9683 Keyless Drill Chuck 1/2 in JT2 Tapered Mount

Product Description

The JACOBS 9683 is a keyless drill chuck designed for use with JT2 tapered spindles on stationary and portable drilling equipment. It accepts round and hex shanks from 3/64 inch (0.039 inch) up to 1/2 inch (0.512 inch), making it a versatile fit across a wide range of drill bit sizes. The chuck operates on a ball bearing design housed in a steel body, delivering consistent grip and reduced runout during high-speed operation. At a maximum rated speed of 7,000 RPM and a TIR of 0.0016 inch, it is built for precision work where bit wander cannot be tolerated. Machinists, tool and die shops, and industrial maintenance technicians are the primary installers.

The 9683 suits drill presses, milling attachments, and other machine tools equipped with a JT2 (Jacobs Taper No. 2) spindle. It is appropriate for both light production and bench-top maintenance drilling in shop environments. The keyless sleeve allows quick bit changes without a chuck key, reducing downtime during repetitive drilling operations. Its closed length of 3.9 inches and sleeve diameter of 1.81 inches should be verified against the host machine clearance before installation.

Key Features

• Keyless operation for fast, tool-free bit changes
• Capacity range of 3/64 inch to 1/2 inch covers standard drill bit sizes
• Ball bearing construction supports smooth, high-speed rotation up to 7,000 RPM
• TIR of 0.0016 inch for low runout and accurate hole placement
• Steel chuck body for durability in shop and industrial environments
• JT2 tapered mount seats securely on compatible machine tool spindles

Compatibility

Designed for machine tool spindles with a JT2 (Jacobs Taper No. 2) tapered mount. Verify spindle taper size and clearance dimensions against the closed length of 3.9 inches and sleeve diameter of 1.81 inches before installation.

Installation Notes

Installation is typically performed by a machinist or qualified maintenance technician. Before mounting, de-energize the machine and lock out the spindle per applicable LOTO procedures. Seat the JT2 taper fully onto the spindle arbor using a soft mallet; never use the chuck jaws as a striking surface. Inspect the taper bore and spindle for burrs or debris before seating to ensure full contact and accurate runout.