Hertel K099404AS Spiral Point Tap 4-40 Unc 2 Flute Hss

Product Description

The HERTEL K099404AS is a spiral point plug tap designed for threading operations in 4-40 UNC applications. Made from high-speed steel with a bright uncoated finish, this tap drives chips forward ahead of the cutting action, making it well suited for through-hole tapping. The H3 thread limit provides consistent tolerance control for standard 4-40 UNC fits. With 2 flutes and a 9/16 inch thread length, it delivers efficient chip evacuation and reliable thread form in a compact size. This tap is used by machinists, maintenance technicians, and fabricators working with small-fastener thread sizes in metal workpieces.

The K099404AS is intended for through-hole tapping in ferrous and non-ferrous metals where chip flow in the cutting direction is an advantage. The plug chamfer style makes it suitable for starting threads in a pre-drilled through-hole without requiring a bottoming or taper lead. It fits standard tap holders and machine tapping setups as well as hand tap wrenches for manual applications in field or shop environments.

Key Features

• Thread size 4-40 UNC with right-hand thread direction
• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• High-speed steel construction for durability across a range of metals
• H3 thread limit for consistent tolerance on standard 4-40 fits
• Bright uncoated finish suitable for use with cutting fluids
• 2 flutes with 9/16 inch thread length for efficient chip removal in small-diameter holes

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for standard 4-40 UNC through-hole tapping applications in shop and field environments.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping procedures. Always use the correct tap drill size for the 4-40 UNC thread profile before tapping. Apply appropriate cutting fluid to extend tool life and improve thread quality. Secure the workpiece firmly and align the tap perpendicular to the hole to avoid tap breakage.