The QMSys Threads is powerful and easy to use software tool for calculation of screw threads, cutting and forming taps, tolerances and fits for linear sizes, thread and plain gauges. The highest software edition offers fully featured, customizable and effective calibration management of all types of thread and plain gauges in accordance with international and national standards and guides.

Editions of the QMSys Thread Software

The software is available in several editions to fit a range of custom needs.

  • Threads - calculating of external and internal threads, tolerances and fits for linear sizes
  • Threads & Gauges - additional determining the parameters of all types of thread and plain gauges
  • Threads, Tools & Gauges - additional calculation of thread cutting and forming taps
  • Threads, Gauges & Calibration Management - calculation and calibration of all types of thread and plain gauges - working plugs, rings and calliper gauges, setting and checking gauges.

Calculation of threads, tolerances, fits, thread and plain and gauges

  • Compliance with the latest revisions of ISO, EN, DIN, ANSI/ASME, BS, JIS, IS, SAE, API standards
  • Calculation of threads with nominal sizes from 0.25 mm up to 1250 mm (0.1 - 50 in.)
  • Almost all types of threads - general purpose threads (metric, unified, Whitworth), metric and inch pipe threads, trapezoidal, buttress, knuckle, helical coil, special threads, development of custom threads 
  • Calculation of tolerances and fits for linear sizes up to 10000 mm (ISO) or up to 200 in. (ANSI)
  • Plain gauges according to ISO standards up to 500 mm, according to ASME standards up to 19.69 in. and according to BS standards for workpiece tolerances 0.005 - 3.2 mm (0.0002 - 0.125 in.)
  • Thread parameters can be chosen from the respective list or inserted directly; this facilitates and smoothens the work process, since it is not necessary to remember the designation of each thread
  • Selection of the recommended in the respective standard nominal sizes, pitches and tolerance classes
  • Calculating all types of working, setting and checking gauges at one step after specifying the thread; the user does not have to bother with repeated entry of the same data for different types of gauges.
  • Nominal and limit sizes on all thread and gauge characteristics - major, minor and pitch diameters, pitch, lead, flank angles, length of gauge and tolerance steps, crest and root flats, etc.
  • Figures from the corresponding standard for thread profile, tolerance zone, gauge profile.
  • Calculation of diameter corrections for all types of finishing operations of the threaded workpieces
  • Computation of limits for pitch diameter measuring over wires or balls, with consideration of the influence of a measuring force, material of the threaded workpiece and the resulting deformations.
  • Printing in standard or customizable templates in RTF, XLS or TXT format; coping in the clipboard
  • User-friendly interface, evidently easier design for usage and result interpretation.

Calibration management for thread and plain gauges

Calibration process of the thread and plain gauges is developed in accordance with international and national standards and guidelines:

  • ISO, ANSI/ASME, DIN and BS standards for the respective thread types
  • DAkkS-DKD-R 4-3 and VDI/VDE/DGQ 2618 Testing instructions, Parts 4.1, 4.2, 4.3, 4.6, 4.7, 4.8, 4.9
  • MIL-STD-I20 Gauge Inspection
  • IFI 301 Gage Calibration Requirements and Procedures for Thread Gages
  • EURAMET cg-6 - Extent of calibration for cylindrical diameter standards
  • EURAMET cg-10 - Determination of pitch diameter of parallel thread gauges by mechanical probing

The software offers customizable calibration procedures for the respective types of gauges, catalogues for measuring instruments, wire and ball probe sets. The calibration procedures include all relevant metrological characteristics - gauge length, lengths of  tolerance steps, thread and flank angles, pitch and lead, major diameter, pitch diameter, minor diameter, taper, form deviations.

Several methods for measurement of the pitch diameter over wires and balls are implemented - three or two wires/balls, perpendicular or inclined. During the measurement the software automatically calculates the limits of indicated values for the selected method, diameter of the wires or balls and measuring force. Measurements can be entered manually by the keyboard or transferred automatically from any measuring instrument or machine, equipped with serial RS 232 or USB interface. Inspection and adjustment of working gauges with the respective checking, setting or master gauges is also implemented in the calibration procedures and the calibration process.


Software trial versions

QMSys Threads software is available for immediate download at: Request an evaluation unlock key by sending an or , and you will have the full version for a 30-day evaluation period. You may also share the trial unlock key we will send to you and the downloaded software with anyone in your organization.