Jacobs 31052 Drill Chuck 1/2 in Threaded Mount 1/2-20 Keyed

Product Description

The JACOBS 31052 is a keyed drill chuck designed for use with threaded-mount drilling equipment. It accepts bit shanks from 0.063 inches up to 0.500 inches (1/2 inch) capacity, making it suitable for a wide range of standard drill bits and accessories. The chuck features a plain bearing design, a steel body for durability, and a 1.72-inch sleeve diameter. It operates on a 1/2-20 threaded mount and uses a KK key for tightening. Machinists, maintenance technicians, and tradespeople who need a reliable replacement or upgrade chuck for threaded-spindle drill presses or portable drilling equipment will find this a straightforward fit.

The JACOBS 31052 is intended for use on drill presses, magnetic drills, and similar equipment that accept a 1/2-20 threaded spindle. Its 1/2-inch maximum capacity covers the most common drill bit sizes used in metal fabrication, HVAC rough-in, electrical conduit work, and general mechanical assembly. The closed length of 3.0 inches and open length of 2.3 inches should be confirmed against the host machine clearances before installation.

Key Features

• 1/2-inch maximum bit capacity accommodates a broad range of standard drill bits
• 1/2-20 threaded mount for direct spindle attachment without adapters on compatible machines
• Keyed operation with KK key for positive, slip-resistant bit clamping
• Steel chuck body for long service life in production and job-site environments
• Plain bearing design provides smooth jaw movement during bit changes
• Compact closed length of 3.0 inches suits space-constrained drill configurations

Compatibility

Designed as a direct-fit replacement for drill presses and portable drilling equipment with a 1/2-20 threaded spindle mount and a 1/2-inch or smaller maximum chuck capacity requirement.

Installation Notes

Installation and removal should be performed by a qualified machinist or maintenance technician with the machine fully powered down and locked out per OSHA lockout/tagout procedures. The spindle threads should be cleaned and inspected before mounting. Use the appropriate chuck key and spindle-holding method to seat the chuck firmly without impact damage to the spindle threads. Confirm closed and open length clearances against the machine's quill travel before returning the equipment to service.