Hertel K033033AS Spiral Flute Tap 3/4-10 Unc Bottoming Hss

Product Description

The HERTEL K033033AS is a spiral flute tap designed for cutting 3/4-10 UNC internal threads in through-hole and blind-hole applications where a bottoming chamfer is required. Built from high-speed steel with an oxide coating, this tap features 4 right-hand flutes with a 45-degree helix angle and a fast flute style that evacuates chips efficiently during the tapping cycle. At 4.25 inches overall length, it is suited for use in drill presses, CNC machining centers, and manual tapping setups. The bottoming chamfer allows threading closer to the bottom of a blind hole than plug or taper style taps. Licensed machinists, tool-and-die workers, and maintenance mechanics are the primary users.

This tap is intended for threading steel, cast iron, aluminum, and similar machinable materials in both production and maintenance-repair-operations environments. The H3 thread limit designates a controlled oversize tolerance appropriate for standard UNC fit classes. The oxide finish provides a degree of surface hardness and lubricity to reduce galling during cutting. No coolant-through capability is present, so flood or brush-applied cutting fluid is recommended for best tool life and thread quality in ferrous materials.

Key Features

• 3/4-10 UNC thread form with right-hand thread direction
• Bottoming chamfer style for threading to near the bottom of blind holes
• 45-degree helix angle with fast flute style for efficient chip evacuation
• H3 thread limit for standard UNC tolerance class fitment
• High-speed steel construction with oxide coating for wear resistance
• 4 flutes for balanced cutting load in medium to hard materials

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 3/4-10 UNC bottoming tap in standard H3 thread limit.

Installation Notes

This tap is installed by qualified machinists or maintenance technicians using a tap wrench, drill press, or CNC tapping cycle with appropriate speed and feed parameters for the workpiece material. Always ensure the pilot hole is drilled to the correct tap drill diameter for 3/4-10 UNC before tapping. Apply cutting fluid generously, particularly when tapping ferrous materials, to reduce heat buildup and extend tap life. Never force a tap through an undersized or misaligned hole, as this is the primary cause of tap breakage.