Jacobs 30247 Drill Chuck 3/8 in Threaded Mount 3/8-24

Product Description

The JACOBS 30247 is a keyed drill chuck with a 3/8 inch maximum capacity and a threaded mount configuration. Designed for use with rotary drilling equipment, this chuck accepts a 3/8-24 inch threaded spindle and uses a KG1 key for tightening. The chuck body is constructed from steel and features a plain bearing design. With a sleeve diameter of 1.22 inches and a closed length of 2.312 inches, this is a compact, dependable tool-holding component suited to both shop and field applications. Installation and service are typically performed by machinists, maintenance technicians, or experienced tradespeople working with drill presses, portable drills, or similar rotary tools.

This chuck is appropriate for use in production, maintenance, and repair environments where a standard 3/8-24 threaded-mount keyed chuck is required. It accommodates bit shanks from a minimum of 0.062 inch up to a maximum of 0.375 inch (3/8 inch), covering the most common drill bit shank sizes used in light-to-medium duty drilling operations. The keyed design ensures a secure grip on the bit during operation, reducing slippage under load.

Key Features

• 3/8 inch maximum drill bit capacity accommodates a wide range of standard shank sizes
• 3/8-24 threaded mount for direct spindle installation
• Keyed operation with KG1 key for positive bit retention
• Steel chuck body for durability in production and maintenance environments
• Plain bearing design for straightforward, low-maintenance operation
• Compact closed length of 2.312 inches minimizes spindle extension

Compatibility

Designed as a threaded-mount replacement chuck for rotary drilling tools and drill presses that accept a 3/8-24 inch threaded spindle interface.

Installation Notes

Installation is performed by threading the chuck onto the compatible 3/8-24 spindle; ensure the spindle is fully de-energized and the tool is unplugged or locked out before mounting or removing the chuck. Use the KG1 key to secure drill bits firmly before operation. Do not exceed the maximum 3/8 inch capacity of the chuck, as oversized shanks can damage the jaws and compromise tool retention.