Westward
Westward 5TWU3 Pipe Tap 1-1/4"-11-1/2 NPT 5 Flutes
Cuts 1-1/4" NPT threads with five flutes for clean, accurate pipe tapping
- TypeHole, Drill, Bore & Wire Gauges
- Cuts precise NPT threads with 5-flute high-speed steel
- 75 percent thread engagement from 1.4844 in drill size
- Right-hand taper design starts cleanly in 1-1/4 in pipe
- Bright uncoated finish resists galling during threading
- 11 threads per inch matches standard NPT specification
Westward 1-1/4" NPT Pipe Tap
The Westward 5TWU3 is a taper pipe tap designed for cutting 1-1/4"-11-1/2 NPT threads in pipe and conduit. It suits plumbers and maintenance technicians who need to create new internal threads or repair damaged ones in the field or workshop. The right-hand cutting direction follows standard threading practice.
High-Speed Steel Construction
Made from bright, uncoated high-speed steel, the tap resists wear during hand or machine threading operations. The five-flute design helps distribute cutting forces evenly across the thread length of 1 3/4 inches. This geometry supports smoother chip evacuation and reduces the risk of tap breakage under load.
Class 3B Fit with 5 Flutes
The tap produces a Class 3B fit using a 75 percent thread drill size of 1.4844 inches for the pilot hole. Its overall length of 4 inches provides adequate reach for standard pipe coupling depths. The NPT taper ensures a sealing thread profile without requiring separate sealant for many applications.
Highlights
- Cuts precise NPT threads with 5-flute high-speed steel
- 75 percent thread engagement from 1.4844 in drill size
- Right-hand taper design starts cleanly in 1-1/4 in pipe
- Bright uncoated finish resists galling during threading
- 11 threads per inch matches standard NPT specification
Specifications
| Brand | Westward |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
How do I install the 1-1/4"-11-1/2 NPT pipe tap and what step is often missed?
Use a 1.4844 in drill for the 75 percent thread hole, apply cutting fluid, start the taper tap square to the workpiece and run it to the 1 3/4 in thread length; the step most often missed is checking alignment before the first full turn.
What maintenance or replacement will this 5-flute high-speed steel tap need later?
The bright uncoated flutes dull with use; resharpen or replace the tap when thread quality drops or cutting torque rises sharply.
What limit appears first when tapping 1-1/4" NPT holes continuously?
Heat buildup in the high-speed steel body and flute loading from chip evacuation become the limiting factors during sustained threading.
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