The new GSR Thread Calculator App

With the new official Thread Calculator from GSR Gustav Stursberg GmbH, you have all the data you need for thread machining at your fingertips.

The operation is intuitive and simple. Available for iOS and android.

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Select from: Threading, Thread Forming or Thread Repair and determine the appropriate core hole and roughing diameters.

By incorporating the following most common thread types, you will save yourself from leafing through table books in the future:

Metric threads: M, MF, TR and TRF.

Industrial threads: UNC, UNEF, UNF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW and BSPP.

The new GSR Thread Calculator App

With the new official Thread Calculator from GSR Gustav Stursberg GmbH, you have all the data you need for thread machining at your fingertips.
The operation is intuitive and simple.

Choose from the areas: Threading, Thread forms or Thread repair and determine the suitable core hole and pre-work diameters.

By incorporating the following most common thread types, you will save yourself from leafing through table books in the future:

Metric threads: M, MF, TR and TRF.

Industrial threads: UNC, UNEF, UNF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW and BSPP.

Three thread calculators in one app

  • Bolt and core hole diameters for threading (internal as well as external)
  • Core hole diameters for thread forming
  • Diameter of STI-/EG tap and core hole diameter for thread repair

Three thread calculators in one app

  • Bolt and core hole diameters for threading (internal as well as external)
  • Core hole diameters for thread forming
  • Diameter of STI-/EG tap and core hole diameter for thread repair

Internal threading

Core hole diameter for internal threading for blind hole drilling

Internal threading

Core hole diameter for internal threading for pre-drilling of blind holes.

External threading

Bolt diameter / pre-drilling diameter for external threading

External threading

Bolt diameter / roughing diameter for external threading

Thread forming

Core hole diameter for thread forming

Gewindeformen

Core hole diameter for thread forming

Thread repair

Diameter of STI tap and core hole diameter for thread repair

Thread repair

Diameter of STI tap and core hole diameter for thread repair