Kennametal 5689888 Spiral Flute Tap 1/2-13 Unc 3B Tin/crc/c

Product Description

The KENNAMETAL 5689888 is a spiral flute tap designed for cutting 1/2-13 UNC internal threads in aluminum and non-ferrous workpiece materials. It features a modified bottoming chamfer, a 45-degree helix angle, and a fast flute style that efficiently evacuates chips up and out of the hole during tapping. The multi-layer TiN/CrC/C coating reduces friction and built-up edge when working aluminum alloys. With a 3B class of fit and H4 thread limit, it produces threads that meet standard tolerance requirements for general mechanical assemblies. This tap is suited for use in CNC machining centers, drill presses, and manual tapping setups.

The 5689888 is applied in production and job-shop environments where 1/2-13 UNC threads are required in aluminum wrought alloys and other non-ferrous materials. The modified bottoming chamfer allows threading close to the bottom of blind holes while still providing adequate chip clearance. With a tapping depth of 1.85 inches and an overall length of 4.33 inches, this tap fits standard tap holders and tapping heads used in light to medium-duty machining operations. It is handled by machinists, tool-and-die makers, and maintenance technicians working in metalworking facilities.

Key Features

• 1/2-13 UNC thread form with 3B class of fit and H4 thread limit for standard tolerance threads
• Modified bottoming chamfer for threading near the bottom of blind holes
• 45-degree right-hand spiral flute with fast flute style for effective chip evacuation in non-ferrous materials
• Multi-layer TiN/CrC/C coating optimized for aluminum and non-ferrous workpiece materials
• Series T682 with right-hand thread direction and no coolant-through requirement
• 3 flutes for balanced cutting action in short-chipping materials

Compatibility

Designed for use in aluminum wrought alloys and non-ferrous materials. Compatible with standard 1/2-13 UNC tap holders, floating tap adapters, and rigid tapping chucks used in CNC and manual machine tool setups.

Installation Notes

This tap should be installed by a qualified machinist following standard toolroom practices. Secure the tap in a properly sized holder with adequate torque before beginning the tapping cycle. Ensure the workpiece is firmly fixtured and the spindle is aligned with the pre-drilled hole to avoid tap breakage. Use a cutting fluid or lubricant appropriate for the workpiece material to extend tool life and maintain thread quality.