Hertel K008113AS Straight Flute Tap 5-40 Unc Hss

Product Description

The HERTEL K008113AS is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where full thread depth close to the bottom is required. Ground from high-speed steel (HSS) and left in a bright, uncoated finish, this tap is suited for general-purpose threading in softer metals, plastics, and similar materials. It cuts a 5-40 UNC right-hand thread to a 2B/3B class of fit, with an H2 thread limit for consistent tolerance control. Overall length is 1-15/16 inches, and the thread length is 5/8 inches. With only 2 flutes, chip clearance is straightforward in open-chip materials.

This tap is used in precision light-assembly and instrument applications where a No. 5 thread is specified. The bottoming chamfer - typically 1 to 2 threads of lead - lets the tap thread nearly to the bottom of a blind hole, making it the correct choice when thread engagement close to the floor of the hole is a design requirement. It is commonly used by machinists, tool-and-die workers, and maintenance technicians on manual taps, tap handles, and low-torque tapping machines in both shop and field environments.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 5-40 UNC right-hand thread standard
• H2 thread limit for controlled 2B/3B class of fit tolerances
• High-speed steel construction for durability in general-purpose threading
• Bright/uncoated finish compatible with a wide range of cutting fluids
• 2-flute design provides adequate chip clearance in free-machining materials

Compatibility

Designed as an OEM-style replacement or standard tooling option for applications requiring a 5-40 UNC bottoming tap with an H2 thread limit and 2B/3B class of fit.

Installation Notes

This tap is installed by licensed machinists or qualified technicians using a tap handle, T-handle wrench, or compatible tapping machine set to the correct speed for the workpiece material. Always apply appropriate cutting fluid and back the tap off periodically to break chips. Ensure the hole is drilled to the correct tap drill diameter for a 5-40 UNC thread before starting. Do not force the tap past resistance, particularly near the bottom of a blind hole, to avoid breakage.