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03A042 - Walter 4-40 NC High Speed Steel Plug Tap

Packaging: 3 per each
$18.22/ea

Package Price:

$54.66/3 per each

Usually ships within 3-5 business days

SKU: 03A042 Categories: ,

OVERVIEW

Precision Threading with Walter High Speed Steel Taps

The Walter 4-40 NC Plug Tap (SKU: 03A042) represents the pinnacle of threading technology for industrial applications. Engineered from premium High Speed Steel (HSS), this tool is designed to withstand the rigorous demands of modern manufacturing and maintenance environments. Unlike standard carbon steel taps that dull quickly, Walter's HSS composition retains its cutting edge hardness even at higher temperatures, ensuring a longer service life and consistent performance across thousands of cycles.

Precision is paramount in threading operations, and this tap features fully ground threads. This manufacturing process guarantees that the tap geometry is exact, resulting in threads that meet strict tolerance requirements. The "Plug" style chamfer, characterized by a taper over 3 to 5 threads, makes this tool exceptionally versatile. It is the standard choice for through holes where the tap can pass completely through the workpiece, but it is also effective in blind holes provided there is sufficient clearance at the bottom. This balance makes it a staple in any machinist's toolkit.

Durability is further enhanced through a meticulous hardening and tempering process. This treatment relieves internal stresses within the metal, significantly reducing the likelihood of the tap shattering under torque—a common failure point in lesser quality tools. Whether you are working with soft non-ferrous metals like aluminum or tougher alloys like mild and stainless steel, the Walter 03A042 delivers clean, burr-free threads. It is an essential component for MRO professionals seeking reliability and precision in their fastening solutions.

By choosing Walter Surface Technologies, you are investing in a legacy of metalworking excellence. This 4-40 NC tap is not just a consumable; it is a precision instrument that improves workflow efficiency by minimizing downtime caused by broken tools or poor thread quality. Ensure your assemblies hold tight and your repairs last with this top-tier threading tool.

Additional Information
Packaging Description:3 per each
Brand:Walter
Material:High Speed Steel (HSS)
Thread Size:4-40 NC
Tap Style:Plug
Thread Type:NC (National Coarse)
Chamfer Type:Plug (3-5 threads)
Application Material:Aluminum, Mild Steel, Stainless Steel

INCLUDED

  • 1 x Walter 4-40 NC Plug HSS Tap
  • Protective packaging

APPLICATIONS

  • Creating new 4-40 NC threads in through holes
  • Repairing damaged or stripped threads in machinery
  • Tapping stainless steel, mild steel, and aluminum components
  • General maintenance and assembly operations
  • Fabrication of electronic enclosures and small brackets
  • Automotive and aerospace part manufacturing

FAQ

A plug tap typically has 3-5 tapered threads at the tip, making it ideal for general use and through holes. A taper tap has a longer chamfer (7-10 threads) for easier starting, while a bottoming tap has very little chamfer (1-2 threads) for threading to the bottom of a blind hole.

Yes, this Walter tap is made from High Speed Steel (HSS) and is hardened to effectively cut threads in stainless steel, as well as mild steel and aluminum.

For a standard 4-40 NC thread, a #43 drill bit (0.0890 inches) is typically recommended to achieve approximately 75% thread height.

Yes, using a high-quality cutting fluid or lubricant is highly recommended. It reduces friction, dissipates heat, extends the life of the tap, and results in cleaner threads.

NC stands for 'National Coarse'. It refers to the standard thread pitch for that diameter. 4-40 indicates a #4 diameter with 40 threads per inch.

It can be used for blind holes, but because it has a 3-5 thread chamfer, it will not create full threads all the way to the very bottom. For blind holes requiring threads to the bottom, a bottoming tap is preferred after starting with a plug tap.

It is manufactured from High Speed Steel (HSS), which offers superior hardness and heat resistance compared to carbon steel.

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