Thread calculator

The official GSR Gustav Stursberg GmbH thread calculator

GSR Gustav Stursberg GmbH · com.gsr.gewinderechnerbygsr

Not rated yet 100K+ downloads v4.0.0 51.9 MB Android 7.0+ PEGI 3 · Everyone

Download APK 51.9 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v4.0.0 (32)
Updated: Feb 23, 2026 (8 months ago)
APK size: 51.9 MB
Requires: Android 7.0+ (API 24)
CPU support: x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Books & Reference (app)
Listed since: Aug 4, 2021 (at least)
Permissions: 8
Website: gsr-germany.de
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Thread calculator is an app by GSR Gustav Stursberg GmbH in the Books & Reference category, listed since at least August 2021. It includes native code for x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 3.3.0, the APK grew from 24.2 MB to 51.9 MB and the minimum Android version rose from 4.4 to 7.0. It asks for 8 permissions, none of them sensitive. Compared with version 3.3.0, it adds 2 new permissions (“Access adservices ad id” and “Access adservices attribution”) and drops 2 (“Show notifications” and “Receive push notifications”). The app can read the advertising ID that ad and analytics services use.

What's new in v4.0.0

✅ Available for more devices ✅ Switch language in the app ✅ Performance improved

Description

From the listing uploaded by “appupdater”.

The app includes: - A calculator for thread cutting for the following units: M, MF, UNC, UNEF, UNF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW, BSPP, TR, and TRF - A calculator for cold forming - A calculator for thread repair You want to know which tap hole you should drill for threading or which bolt you should use? With this app, you will find the desired measures in no time: Simply select the desired thread type, nominal size, and pitch and you will get the matching diameter for your project. This saves precious time you would have spent tediously searching for internal and external thread dimensions in tables. As this app is still in its development phase, new features will follow soon, so stay tuned! GSR Gustav Stursberg GmbH is a manufacturer for high-quality thread cutting tools with 130 years of operational experience in the area of threading tool production. The product portfolio includes a wide selection of tools for different areas of application. GSR taps, twist drills, round dies, and tool holders are manufactured to the highest quality standards in our own production facilities. The constant quality control during the production process guarantees a consistent good quality in all national as well as international production facilities. This requires enormous precision, which is reflected by our tools. Because: Precision is in the details. Since 1889.

Version history

2 versions are listed, going back to v3.3.0. Since v4.0.0 it requires Android 7.0+.

v4.0.0 LATEST Feb 23, 2026 51.9 MB TRUSTED v3.3.0 Nov 23, 2025 24.2 MB TRUSTED

All 2 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Feb 23, 2026.
Certificate issued to “GSR” This is the certificate of the Google Play version.
Same certificate as the other version checked

Store checks and file details

Developer signature verified Feb 23, 2026
Validated against Google Play Feb 23, 2026
Signed byOU=appdevelopment, O=GSR
Signing certificate (SHA-1)64:32:C5:C1:ED:4C:00:9F:9B:78:1D:C0:CD:E7:81:A2:30:BF:EB:52
File MD5e9170659106260fc8d286979ce4b2688
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (8)

Thread calculator requests 8 permissions, none of them sensitive.

Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Advertising ID com.google.android.gms.permission.AD_ID
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
Internal broadcast protection (app-defined) com.gsr.gewinderechnerbygsr.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch

Thread calculator APK: questions and answers

Is there a version of Thread calculator for older Android phones?

The current version needs Android 7.0 or later. Version 3.3.0 is the newest listed build that installs on Android 4.4 and later. Get version 3.3.0 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Thread calculator APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the other version checked. After downloading, check that the file's MD5 is e9170659106260fc8d286979ce4b2688.