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Walter 5-40 NC HSS Bottoming Tap for Blind Holes

$19.52/ea $50.34/3 per each only $16.78/eaSave 14%

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OVERVIEW

Get the Job Done Right with Walter HSS Taps

There is nothing more frustrating than a tap breaking off inside a hole right at the end of a project. Avoid the headache and choose the reliability of the Walter 5-40 NC Bottoming Tap. Built for serious fabricators and mechanics, this tap is crafted from heavy-duty High Speed Steel (HSS), making it tough enough to slice through stainless steel and mild steel like butter. Unlike cheap carbon steel taps that dull after a few turns, this Walter tap stays sharp, giving you clean, precise threads every single time.

This is a "Bottoming" style tap, which means it is the closer of the tapping world. When you are working on a blind hole—one that doesn't go all the way through the metal—you need threads that go as deep as possible. Standard taps have a long tapered tip that leaves the bottom of the hole unthreaded. This Walter bottoming tap has almost no taper, allowing you to thread right to the bottom of the hole. This ensures your bolts and screws have maximum engagement for a secure, vibration-resistant hold.

Why struggle with inferior tools? Walter Surface Technologies is a leader in metalworking for a reason. Their taps feature precision-ground threads that reduce friction and drag. This means less effort for you and less heat buildup in the metal. Whether you are fixing a stripped thread on an engine block, fabricating a custom bracket, or working with aluminum fixtures, this tap gives you the confidence to turn the handle without fear. Add the Walter 5-40 NC Bottoming Tap to your toolbox and experience the difference quality makes.

Perfect for use with tapping fluids to further extend tool life, this tap is a must-have for anyone who demands professional results. Don't let a blind hole stop your progress; reach for the tool designed to finish the job perfectly.

Additional Information
Brand:Walter Surface Technologies
Packaging Description:1 per each
Used To Cut:Steel, Stainless Steel & Aluminum
Thread Size:5-40 NC
Tap Style:Bottoming
Material:High-Speed Steel (HSS)
Thread Standard:National Coarse (NC)
Chamfer Length:1-2 Threads

INCLUDED

  • 1 x Walter 5-40 NC High Speed Steel Bottoming Tap
  • Protective Storage Case

APPLICATIONS

  • Creating internal threads in blind holes
  • Repairing stripped or damaged threads
  • Machining mild steel and structural steel
  • Threading stainless steel components
  • Working with non-ferrous metals like aluminum
  • Maintenance and repair operations (MRO)
  • Automotive and machinery fabrication

FAQ

A bottoming tap has a very short chamfer (1-2 threads), allowing it to thread to the bottom of a blind hole. A plug tap has a longer chamfer (3-5 threads) and is easier to start but leaves incomplete threads at the bottom of the hole.

For a 5-40 NC thread, a #38 drill bit is typically recommended to achieve approximately 75% thread height.

Yes, this Walter tap is made from High Speed Steel (HSS), which is suitable for cutting threads in stainless steel, mild steel, and aluminum.

Yes, using a high-quality tapping fluid or lubricant is highly recommended to reduce friction, dissipate heat, and extend the life of the tap.

NC stands for 'National Coarse,' which refers to the thread pitch standard. 5-40 NC indicates a #5 diameter with 40 threads per inch.

Yes, a bottoming tap can be used for through holes, but it is harder to start straight compared to a taper or plug tap. It is best reserved for blind holes or finishing threads.

HSS retains its hardness at higher temperatures and is more resistant to abrasion, allowing it to cut harder materials and last significantly longer than carbon steel.

Ensure the hole is drilled to the correct size, use plenty of lubricant, keep the tap perpendicular to the surface, and back off the tap frequently to break chips.
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