A-A-411 Die, Thread Cutting (Round, Split, Metric Series)

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This commercial item description covers adjustable, round split dies with metric threads.

Salient characteristics.

Design. Dies shall be cylindrical in shape with a split (slot) from the threads to the periphery. One side of the slot shall be tapped and furnished with an adjustment setscrew. Two dimples in the periphery, 180 degrees apart to 90 degrees to the slot, and midway between the die’s faces shall be provided for retaining the die in the diestock. Threads shall be right-hand unless otherwise specified.

Material. Carbon steel or high speed steel.

Hardness. Rockwell C57 to 63 for carbon tool steel, Rockwell C61 to 63 for high speed steel. The cutting lands of the die threads shall show no evidence of partial or total decarbonization.

Sizes. Dies shall be furnished in the following sizes.

Threads. Thread form shall be American National or Unified National. Threads on the front face shall be chamfered approximately 2 to 3 threads and 1 to 1-1/2 threads on the back face.

Marking. The dies shall be marked on the front face in a legible and permanent manner with the manufacturer’s name or trademark, the thread size, and “HS”, “HSS”, or “High Speed” to indicate high speed steel, if applicable.

Workmanship. All dies shall be from imperfections which may affect their appearance, serviceability, or durability.

Certification.      The contractor shall certify that the product offered meets the salient characteristics of this commercial item description and that the product conforms to the producer’s own drawings, specifications, standards, and quality assurance practices and is the same product offered for sale in the commercial marketplace. The government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract.