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Silver metal round threading die marked 12-40 with adjustment screw slot

Drill America

Drill America DWTSR1-12-40 12-40 HSS Round Adjustable Die

SKU CH-C9Z0-PZAR3

High-speed steel adjustable die cuts 12-40 threads with a one-inch outside diameter

  • High-speed steel construction extends die life for repeated threading tasks
  • 12-40 thread specification matches precise fastener requirements
  • Dual chamfer design enables threading and shoulder work with one tool
  • Fine-pitch adjustment screw allows accurate thread fit control
  • California Proposition 65 warning indicates chemical hazard awareness

Threading tool for 12-40 threads

The Drill America DWTSR1-12-40 is a high-speed steel round adjustable die cut for a 12-40 thread pitch. It is intended for machinists and maintenance technicians who need to create or repair external threads on rod or pipe. The die is supplied new and carries California Proposition 65 warnings for cancer and reproductive harm.

Chamfered faces and fine-pitch adjustment

Each face of the die is chamfered differently: one side offers a 2 to 3 thread lead for starting a cut, while the opposite side provides a 1 to 1-1/2 thread lead for work close to a shoulder. A fine-pitch screw opens or closes the die halves, and the slot is beveled so the screw can be removed when the die is mounted in a machine holder that supplies its own adjustment.

High-speed steel construction for wear life

The high-speed steel body resists wear during repeated threading operations. The round profile fits standard die stocks and machine holders, and the adjustable split design lets the user compensate for material spring-back or achieve a specific fit class without replacing the tool.

Highlights

  • High-speed steel construction extends die life for repeated threading tasks
  • 12-40 thread specification matches precise fastener requirements
  • Dual chamfer design enables threading and shoulder work with one tool
  • Fine-pitch adjustment screw allows accurate thread fit control
  • California Proposition 65 warning indicates chemical hazard awareness

Specifications

BrandDRILL AMERICA

Questions about this item

Will the HSS cutting edges on the 12-40 die need sharpening or replacement after extended threading work?

The high-speed steel construction provides improved wear life, so the die resists dulling longer than carbon steel; when threads eventually lose sharpness the die is typically replaced rather than resharpened.

What limits continuous threading with this 1-inch OD adjustable die before the tool itself becomes the bottleneck?

The fine-pitch adjustment screw controls the thread class; under sustained use the practical limit is the point where the die halves can no longer be opened or closed precisely enough to hold the required 12-40 fit.

Does the 12-40 HSS die generate noticeable heat or require lubrication during all-day threading?

High-speed steel runs cooler than carbon steel, but cutting fluid is still recommended to evacuate chips and reduce friction during prolonged sessions; no Proposition 65 chemical is released by normal cutting heat.

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