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Walter 7/16-14 NC HSS Bottoming Tap for Blind Holes

$37.24/ea $96.06/3 per each only $32.02/eaSave 14%

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OVERVIEW

Heavy-Duty HSS Bottoming Tap

Achieve superior thread quality with the Walter 7/16"-14 NC Bottoming Tap. Built for the demands of the welding and industrial maintenance sectors, this tool is crafted from top-tier High-Speed Steel (HSS). Its robust composition allows it to cut through hard metals like stainless steel and mild steel without losing its edge, making it a reliable addition to any tool crib. The 7/16"-14 National Coarse (NC) thread specification is a standard size for many bolts and fasteners used in heavy machinery and structural assemblies.

The primary advantage of this bottoming tap is its ability to thread blind holes effectively. Unlike taper or plug taps which have longer lead-ins, the bottoming tap has a minimal chamfer. This design ensures that full-depth threads are created right down to the bottom of the drilled hole, maximizing the engagement length for bolts and studs. This is particularly critical in high-stress applications where every millimeter of thread engagement counts towards the structural integrity of the connection.

In addition to its geometric advantages, the Walter 03B073 boasts precision-ground flutes that aid in chip evacuation, preventing clogging and binding during operation. This attention to detail reduces the torque required to turn the tap, minimizing operator fatigue during hand tapping and reducing load on machinery during power tapping. Whether used with a tap wrench or a machine holder, this Walter tap provides the reliability and performance professionals expect.

Additional Information
Brand:Walter Surface Technologies
Packaging Description:1-per-each
Thread Size:7/16"-14
Thread Standard:NC (National Coarse)
Tap Style:Bottoming
Material:High-Speed Steel (HSS)
Chamfer Length:1-2 Threads

INCLUDED

  • 1 x 7/16"-14 NC Bottoming Tap (HSS)

APPLICATIONS

  • Threading blind holes in machinery parts and castings
  • Repairing stripped 7/16"-14 threads in maintenance operations
  • Fabrication of components using mild steel, stainless steel, or aluminum
  • Creating full-depth threads in limited-clearance holes
  • General industrial metalworking and assembly

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 cannot thread as deep into a blind hole.

It is made from premium High-Speed Steel (HSS), which offers excellent hardness and heat resistance for cutting metal.

Yes, the hardened and tempered HSS construction makes it suitable for tapping stainless steel, as well as mild steel and aluminum.

The thread size is 7/16 inch with a pitch of 14 threads per inch (National Coarse - NC).

Yes, for a 7/16"-14 NC thread, the standard tap drill size is typically a Letter U drill bit (0.3680 inches).

While possible, bottoming taps are difficult to start straight because they lack a tapered lead-in. They are best used after a taper or plug tap has already started the thread.

A blind hole is a hole that is drilled to a specific depth without breaking through to the other side of the workpiece.
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