Hertel K008039AS Straight Flute Tap 2-56 Unc Hss

Product Description

The HERTEL K008039AS is a straight flute hand tap designed for cutting 2-56 UNC internal threads in through-holes and blind holes where chip packing is manageable. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers consistent thread quality in a range of ferrous and non-ferrous materials. It features 3 straight flutes, a plug chamfer for guided thread starting, and an H2 thread limit for close-tolerance 2B class of fit applications. Overall length is 1.75 inches. Right-hand thread direction. Machinists, tool-and-die makers, and maintenance technicians use this tap for fine-thread work on small fastener holes in both production and repair settings.

The K008039AS is suited for tapping 2-56 UNC threads in light-to-medium duty applications on manual machines, drill presses, tapping arms, or by hand. The plug chamfer - typically 3 to 5 threads of lead - makes it appropriate for through-holes and for starting threads in blind holes when followed by a bottoming tap. It is commonly used in electronics assembly, instrument manufacturing, and general machine shop work where small-diameter precision threads are required.

Key Features

• 2-56 UNC thread form for fine-pitch small-diameter fastener holes
• 3 straight flutes - compatible with through-hole and manageable chip-load blind-hole applications
• Plug chamfer provides a controlled thread-lead entry
• H2 thread limit holds 2B class of fit tolerances
• High-speed steel construction handles a broad range of workpiece materials
• Bright, uncoated finish - no coating buildup to affect thread tolerance in tight fits

Compatibility

Designed as a standard replacement or stock tap for any application requiring a 2-56 UNC straight flute plug tap with an H2 thread limit and 2B class of fit.

Installation Notes

This tap is installed by licensed machinists or qualified technicians using standard tapping equipment or hand tap wrenches. Always secure the workpiece before tapping, use appropriate cutting fluid for the workpiece material, and back off periodically to break chips. Never force a tap against resistance - tap breakage in small-diameter taps is common when feed pressure exceeds the tool's torque capacity.