Hertel K008458AS Straight Flute Tap 3/8-24 Unf Hss

Product Description

The HERTEL K008458AS is a straight flute tap designed to cut 3/8-24 UNF internal threads in through-hole and blind-hole applications. Built from high-speed steel with a bright, uncoated finish, this tap handles general-purpose threading in a wide range of metals and materials. It features 4 straight flutes, a taper chamfer for easy thread starting, and a right-hand thread direction. The H3 thread limit provides consistent tolerance control, and the 3B class of fit suits standard fastener and assembly applications. Overall length is 2-15/16 inches. Machinists, maintenance technicians, and tool-and-die professionals use this tap in both manual and machine tapping setups.

This tap is suited for production and maintenance threading in materials such as mild steel, aluminum, brass, and similar machinable metals. The taper chamfer distributes cutting forces across multiple leading threads, reducing stress on entry and making it a reliable choice for hand tapping or low-speed machine tapping where controlled thread engagement is needed. The 3/8-24 UNF thread form is widely used in precision mechanical assemblies, hydraulic fittings, and instrumentation components requiring a finer pitch than standard UNC threading.

Key Features

• 3/8-24 UNF thread form with right-hand direction for standard fastener compatibility
• Taper chamfer distributes load across entry threads for easier starting
• 4 straight flutes for chip clearance in through-hole and shallow blind-hole applications
• H3 thread limit for consistent 3B class-of-fit tolerance control
• High-speed steel construction provides durability in general machining and maintenance work
• Bright, uncoated finish compatible with a wide range of cutting fluids and lubricants

Compatibility

Designed as an OEM-style replacement or direct tooling addition for any application requiring a 3/8-24 UNF straight flute tap with a 3B class of fit and H3 thread limit in high-speed steel.

Installation Notes

This tap should be installed in a standard tap wrench, T-handle, or machine tap holder appropriate for the shank size. Always apply a suitable cutting fluid or tapping oil matched to the workpiece material before and during tapping. Secure the workpiece firmly before beginning the threading operation, and back the tap off periodically to break chips when tapping in ductile metals. Do not force the tap if resistance increases unexpectedly, as breakage can occur.