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TDWIN – Thread Disk Software for Straight Thread Dimensions

The Thread Disk™ engineering software (TDWin™ ) calculates critical dimensions for threads based on ANSI tables and formulas. Thread types supported by the program include: UN, UNJ and UNR Series, Acme, Stub Acme, Stub Acme Modified I and II, Metric M & MJ, 7° X 45° Buttress, and General Purpose Pipe Threads.

To generate critical dimensions instantly, enter basic thread information on the Thread Type Entry screen, such as: thread type, thread class, nominal diameter, and threads per inch. Once the results are computed, tabs at the bottom of the program allow selection of several types of calculated information, including dimensions and tolerances for product threads, ring gages, set plugs, plug gages or Gagemaker’s Thread Diameter gages.

TDWIN provides the important master setting values for setting Gagemaker PG-6000 Series, RG-7000 Series, PD-6000 Series, and PD-8000 Series gages to flat and V standards.

If measuring internal and external shallow taper diameters is a problem, the Ball mic SET DIM Tool provides setting dimensions for ball micrometers or Gagemaker’s BX-1000 groove gage. The program calculates ball mic settings for any tapered surface geometry.

The software also provides differential analysis tolerance.  This is the value received when comparing the pitch diameter tolerance and the functional diameter tolerance of a thread.  The spec says that if a threads pitch diameter and functional diameter measured tolerances are within 40% of the total pitch diameter tolerance, then you can be geometrically sure that the lead, form, and ovality values of the thread are to the correct specification without independently measuring each of these additional thread features. This is important when performing a System 22 inspection of a thread.

Other features of the program include the ability to print thread dimension reports, providing a paper copy of any calculation. These reports provide the same critical dimensions that display in the program. A multiple calculation window capability is a feature that allows performing several different thread calculation at the same time.

System Requirements

  • Windows XP or higher
  • 64 MB RAM
  • 3 MD of free hard disk space
  • USB drive


  • Uses ANSI tables, formulas, and tolerances
  • Calculates standard and non-standard product thread diameters from #000 to 99.8″
  • Calculates ANSI ring and plug gage dimensions
  • Addresses pitches from 1 to 400
  • Calculates Gagemaker style thread gage seting dimensions