Hertel K099409AS Spiral Point Tap 1/2-13 Unc Bottoming Hss

Product Description

The HERTEL K099409AS is a spiral point tap designed for threading 1/2-13 UNC holes in metalworking applications. Built from high-speed steel with a bright, uncoated finish, it features a bottoming chamfer for threading close to the bottom of blind or through holes. The 3-flute spiral point geometry pushes chips forward ahead of the cut, keeping the flutes clear and reducing the chance of chip packing. It carries a Class 3B thread fit tolerance and an H3 thread limit, making it suited for close-tolerance threaded connections. Thread length is 1-21/32 inches. Right-hand cut. Part weight is 0.06 pounds.

This tap is used in machine shops, maintenance and repair operations, and production environments where 1/2-13 UNC internal threads are required. The bottoming chamfer makes it particularly useful when the full thread depth must extend to the bottom of a blind hole, often as the final step after a taper or plug tap has started the thread. Typical materials tapped with HSS spiral point taps include mild steel, aluminum, brass, and similar machinable alloys.

Key Features

• Spiral point geometry pushes chips forward, reducing packing in the flute
• Bottoming chamfer allows threading to the base of blind holes
• High-speed steel construction for general-purpose metalworking
• Bright, uncoated finish suitable for use with standard cutting fluids
• H3 thread limit and Class 3B fit for close-tolerance threads
• Right-hand cut, 3 flutes, 1/2-13 UNC thread standard

Compatibility

Designed for cutting 1/2-13 UNC right-hand internal threads as an OEM-style replacement or standard production tap for use in machining centers, drill presses, and hand-tapping operations requiring a bottoming chamfer.

Installation Notes

This tap is installed by machinists and tool-and-die professionals using a tap wrench, tapping head, or CNC rigid-tapping setup. Always use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Ensure the pilot hole diameter is correct for 1/2-13 UNC before tapping. Do not reverse the tap under power without confirming the machine is configured for thread reversal.