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Small round metal die with knurled edge and adjustment slot

Drill America

Drill America DWTSR112-71640 7/16"-40 HSS Round Adjustable Die

SKU CH-3J7G-ASTJH

A 7/16"-40 HSS round adjustable die cuts external threads with a 1-1/2" outer diameter for threading close to shoulders

  • High-speed steel construction extends wear life during threading operations
  • Adjustable fine-pitch screw allows precise thread diameter control
  • Dual chamfer design handles both standard and shoulder-close threading
  • 7/16"-40 thread specification matches specific fastening requirements
  • California Proposition 65 warning indicates regulated chemical content

7/16"-40 HSS Round Adjustable Die

The Drill America DWTSR112-71640 is a high-speed steel round adjustable die designed for cutting 7/16 inch diameter threads with a 40 pitch. It suits machinists and maintenance technicians who need to create or repair external threads on rods, bolts or pipe in a workshop or field setting.

Wear resistance and adjustment under load

High-speed steel construction provides improved wear life during sustained threading operations compared with carbon steel alternatives. The die adjusts via a fine-pitch screw that spreads the sides or lets them spring together, so thread fit can be corrected mid-job without removing the tool from the holder.

Chamfer limits for shoulder and start conditions

One face carries a 2 to 3 thread chamfer for normal thread starts, while the opposite face has a 1 to 1-1/2 thread chamfer to permit threading close to a shoulder. The beveled slot allows the adjusting screw to be removed when the die is mounted in a machine holder, transferring adjustment to the holder's own screws.

How it compares

Measured against everything we stock in Garden Hoses & Pipe Tubing, at today’s prices. Recalculated every night.

Price $24.99
Pricier than about 56% of the 973 comparable items (median $21.99).

Specifications

Product
Brand nameDRILL AMERICA

Questions about this item

Does the HSS round adjustable die generate noticeable heat during extended threading sessions?

High-speed steel construction resists wear, reducing friction buildup during prolonged use. The adjustable fine-pitch screw maintains consistent thread engagement, which helps manage heat generation.

What die stock or holder is required to operate the 1-1/2 inch OD die?

A compatible die stock or machine holder accepting 1-1/2 inch outside diameter round dies is needed. The beveled slot allows holder adjusting screws to control expansion when the die's own screw is removed.

Can this 7/16"-40 die cut threads on existing mild steel rod without excessive force?

The HSS material and 2-3 thread entry chamfer are designed for clean starting on common metals. Adjustable split design lets you tighten gradually for controlled thread depth on standard rod stock.

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