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Round silver metal die with knurled edges and adjustment screw

Drill America

Drill America DWTH4-112NPT 1-1/2" NPT 4" OD HSS Adjustable Pipe Die

SKU CH-46C2-BA6V0

High-speed steel adjustable die cuts 1-1/2" NPT threads with chamfered faces for shoulder work

  • Adjustable thread fit via fine-pitch screw for precise NPT threads
  • High-speed steel construction extends wear life during pipe threading
  • Dual chamfer design enables threading near shoulders and standard starts
  • Round die profile suits machine holders with adjustable screw removal
  • California Proposition 65 warning: contains chemicals linked to cancer and reproductive harm

1-1/2" NPT Pipe Threading Die

This Drill America round adjustable die cuts 1-1/2"-11-1/2 NPT threads on pipe using high-speed steel for extended wear life. It is intended for plumbers and maintenance technicians who need to create or repair tapered pipe threads in the field or shop. The die suits manual or machine threading operations where NPT standard threads are required. It is not for buyers who need straight mechanical threads or metric pipe sizes.

High-Speed Steel Adjustable Thread Form

The die uses a fine-pitch adjustment screw to open or close the thread form, allowing precise fit control during cutting. Chamfers on both faces provide a 2-to-3 thread lead for starting and a 1-to-1-1/2 thread lead for threading close to a shoulder. The slot is beveled so the adjusting screw can be removed for use in a machine holder with built-in adjustment. California Proposition 65 warnings apply for cancer and reproductive harm.

Machine Holder Compatibility Changes Workflow

When the adjusting screw is removed, the beveled slot engages the holder's own adjustment screws for automated threading setups. This allows the same die to serve both hand-held die stocks and powered pipe threading machines without modification. The accessory change shifts the adjustment method from the die itself to the holder, reducing setup time for repeated production runs. No additional accessories or software are bundled with this die.

Highlights

  • Adjustable thread fit via fine-pitch screw for precise NPT threads
  • High-speed steel construction extends wear life during pipe threading
  • Dual chamfer design enables threading near shoulders and standard starts
  • Round die profile suits machine holders with adjustable screw removal
  • California Proposition 65 warning: contains chemicals linked to cancer and reproductive harm

Specifications

BrandDRILL AMERICA

Questions about this item

What does the 1-1/2"-11-1/2 NPT size mean when I thread a pipe?

It produces a 1-1/2 inch nominal pipe thread with 11-1/2 threads per inch to the National Pipe Taper standard, creating a tapered seal on compatible fittings.

How does the NPT standard affect the thread I cut?

NPT threads are tapered so the flanks seal as they tighten; the die cuts 11-1/2 threads per inch on a 1-1/2 inch nominal bore.

What holder or handle do I need for the 4 inch round die?

The 4 inch outside diameter fits standard 4 inch die stocks or machine holders that accept round adjustable dies.

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