Hertel K008115AS Straight Flute Tap 5-40 Unc Hss

Product Description

The HERTEL K008115AS is a straight flute tap designed to cut 5-40 UNC internal threads in a wide range of workpiece materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable thread-cutting performance in production and maintenance environments. The taper chamfer eases entry into the hole and distributes cutting load across multiple leading threads, reducing the risk of tap breakage in through-hole applications. With an overall length of 1.9375 inches and a 3-flute configuration, it suits hand tapping and machine tapping operations where straight chip flow is acceptable. Machinists, toolmakers, and maintenance technicians install this tap in drill presses, tapping machines, or by hand.

This tap is intended for threading 5-40 UNC holes in ferrous and non-ferrous metals, plastics, and similar machinable materials. The taper chamfer style makes it particularly well-suited for through-hole applications where chips can clear ahead of the tap. It accommodates both 2B and 3B class-of-fit thread tolerances, giving the installer flexibility for standard commercial fits as well as tighter tolerance requirements. The H2 thread limit designation indicates a ground thread tolerance suitable for most general-purpose 5-40 threading work. Right-hand thread direction is standard.

Key Features

• 5-40 UNC thread form with H2 thread limit for controlled tolerance
• Taper chamfer distributes cutting load and eases hole entry in through-hole applications
• 3-flute straight flute design for hand or machine tapping
• High-speed steel construction provides good wear resistance across common machinable materials
• Bright, uncoated finish — no coating buildup concerns in sensitive or light-duty applications
• Accepts 2B and 3B class-of-fit requirements in a single tap

Compatibility

Designed as a standard replacement or production straight flute tap for 5-40 UNC through-hole threading applications. Compatible with standard tap holders and collets sized for the 5-40 shank diameter.

Installation Notes

Install using a properly sized tap wrench or machine tap holder rated for small-diameter taps. Ensure the drilled hole diameter matches the recommended tap drill size for 5-40 UNC threads before tapping. Apply a suitable cutting fluid for the workpiece material to extend tap life and improve thread finish. Do not force or side-load the tap — back off periodically to break chips when tapping deeper holes.