Hertel K099407AS Straight Flute Tap 8-32 Unc Hss

Product Description

The HERTEL K099407AS is a straight flute plug tap designed for cutting right-hand internal threads in through-holes and open-ended blind holes. Built from high-speed steel with a bright, uncoated finish, it cuts 8-32 UNC threads using 3 flutes and a plug chamfer that provides a gradual lead-in for reduced starting torque. The overall length is 2.125 inches. The H1 thread limit holds tight tolerance control, making this tap a reliable choice for precision threading in soft to medium-hardness metals, plastics, and similar materials. Machinists and maintenance technicians reach for this style of tap in both manual and machine tapping applications.

This tap is suited for production and maintenance threading operations where 8-32 UNC fastener holes are required. The plug chamfer — typically 3 to 5 threads of lead — makes it the most common tap geometry for general-purpose work. It performs well in drill presses, tapping arms, CNC machining centers, and hand tapping. Typical applications include sheet metal fabrication, electrical enclosure assembly, mechanical assemblies using 8-32 machine screws, and repair work on stripped or damaged threads.

Key Features

• 8-32 UNC thread form for standard unified coarse thread fastener compatibility
• Plug chamfer provides a gradual cutting lead, suitable for through-holes and most blind-hole applications
• 3 straight flutes for chip clearance in a compact tap body
• High-speed steel construction handles a broad range of workpiece materials
• H1 thread limit ensures close tolerance control on finished thread diameter
• Bright, uncoated finish — no coating buildup to affect thread dimensions

Compatibility

Designed as a standard replacement or working tap for any application requiring 8-32 UNC right-hand internal threads. Fits standard 8-32 tap holders, collets, and tapping chucks sized for this shank diameter.

Installation Notes

Always secure the workpiece and use the correct tap drill size for 8-32 UNC prior to tapping. Apply cutting fluid appropriate to the workpiece material to extend tap life and improve thread finish. In machine tapping, set spindle speed and feed to match the tap pitch to avoid overloading the flutes. Inspect the tap for chipping or wear before each use — a damaged tap should be replaced, not forced.