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Round silver metal die with knurled edge and central hole

Drill America

Drill America DWTSR1-1212 1/2"-12x1" OD HSS Round Adjustable Die

SKU CH-S0BG-ZPFFC

Cuts 1/2"-12 threads with an adjustable high-speed steel die that can be tuned for fit and shoulder clearance

  • High Speed Steel for extended wear life
  • Adjustable design enables precise thread sizing
  • Chamfered both sides for versatile threading starts
  • Fine pitch screw allows smooth die adjustment
  • Compatible with machine holders for automated use

Threading Tool For Maintenance

The Drill America DWTSR1-1212 is a High Speed Steel round adjustable die sized 1/2"-12 with a 1" outside diameter. It is built for cutting or restoring external threads on rods, bolts or pipe where improved wear life matters. The die suits professional mechanics, maintenance crews and serious DIYers who need reliable thread cutting in steel or similar materials.

Limits Of The Adjustable Die Standard

Adjustment relies on a fine-pitch screw that spreads the die halves or lets them spring together, so the thread class can be tuned within a narrow range. The slot is beveled for holder screws, yet the adjustment travel is small and cannot compensate for major diameter errors. Hard or abrasive workpieces will still wear the HSS cutting edges faster than coated alternatives, and the die cannot cut internal threads.

Build Quality And Daily Use

Chamfers on both faces give a 2 to 3 thread lead for starting and a 1 to 1-1/2 thread lead for work close to a shoulder, reducing cross-threading risk. The round 1" OD fits standard die stocks and machine holders, allowing hand or powered operation. California Proposition 65 warnings apply because the product contains chemicals linked to cancer and reproductive harm, so gloves and ventilation are prudent during prolonged use.

Highlights

  • High Speed Steel for extended wear life
  • Adjustable design enables precise thread sizing
  • Chamfered both sides for versatile threading starts
  • Fine pitch screw allows smooth die adjustment
  • Compatible with machine holders for automated use

Specifications

BrandDRILL AMERICA

Questions about this item

Should I choose the 1/2"-12x1" OD die or a different size for my threading job?

Select the 1/2"-12x1" OD die when you need to cut 1/2 inch diameter threads with a 12 pitch; the 1 inch outside diameter fits standard die stocks and holders for that thread specification.

What does the 12 threads-per-inch figure mean once the die is in the machine?

The die will cut 12 threads along every inch of the rod or pipe, giving a standard coarse pitch that matches 1/2"-12 nuts and fittings.

How does the fine-pitch adjusting screw cap the thread fit in practice?

The fine-pitch screw opens or closes the split die, letting you tighten or loosen the thread class by small increments so the finished threads gauge correctly.

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