Hertel K008112AS Straight Flute Tap 5-40 Unc Hss

Product Description

The HERTEL K008112AS is a straight flute tap designed for cutting internal threads in a 5-40 UNC configuration. Made from high-speed steel with a bright, uncoated finish, this tap delivers reliable thread-forming performance in ferrous and non-ferrous materials. The plug chamfer style makes it suited for through-hole and partially blind threading operations where the cut can progress gradually into the workpiece. With 2 flutes and an H2 thread limit, it holds tight tolerance for 2B and 3B class of fit applications. Overall length is 1-15/16 inches, and the right-hand thread direction is standard for general machine shop and production use.

This tap is intended for use in machine shop, toolroom, and light production environments where small-diameter UNC threads are required. The 5-40 size is common in instrument, electronics, and precision assembly work. Machinists, tool-and-die makers, and maintenance technicians will encounter this thread size in panels, enclosures, and small mechanical assemblies. The plug chamfer configuration is the most common tap style and works in both hand tapping and machine tapping setups.

Key Features

• 5-40 UNC thread form for small-diameter fastener applications
• 2-flute straight flute geometry for chip control in through and shallow blind holes
• Plug chamfer for gradual thread engagement at the start
• H2 thread limit holding 2B and 3B class of fit tolerance
• High-speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or production tap for any application requiring a 5-40 UNC internal thread with a plug chamfer in 2B or 3B class of fit.

Installation Notes

This tap should be installed in a tap wrench, tapping head, or CNC rigid tap holder appropriate for the shank size. Always use a cutting fluid compatible with the workpiece material to extend tool life and improve thread finish. Ensure the tap is aligned perpendicular to the workpiece surface before beginning the cut. Inspect the tap for wear or chipping before each use, as a damaged tap can produce out-of-tolerance threads or break in the hole.