O-Ring Master

GMORS O-Ring Master is the completed tool for standard rubber seal sizes.

GMORS- Ge Mao Rubber Industrial Co., Ltd. · tw.com.masterhand.oringmaster

Not rated yet 10K+ downloads v5.0.2 12.1 MB Android 6.0+ PEGI 3 · Everyone

Download APK 12.1 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v5.0.2 (11)
Updated: Oct 2, 2026 (6 days ago)
APK size: 12.1 MB
Requires: Android 6.0+ (API 23)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Tools (app)
Listed since: Feb 20, 2021 (at least)
Permissions: 2
Website: gmors.com
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

O-Ring Master is an app by GMORS- Ge Mao Rubber Industrial Co., Ltd. in the Tools category, listed since at least February 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 3.0, the minimum Android version rose from 4.0.3 to 6.0. It asks for 2 permissions, none of them sensitive. Compared with version 4.0, it drops 3 permissions: “View network connections”, “Get tasks” and “Modify shared storage”.

What's new in v5.0.2

Regular maintenance and performance improvements.

Description

From the listing uploaded by “appupdater”.

GMORS O-Ring Master is the completed tool for standard rubber seal sizes. When you use this APP, you do not need to have internet. In addition to O-Ring sizes, it also includes the search functions of X-Ring and Back-Up Ring. You can also use O-Ring Housing to choose suitable O-Ring in your application. Main functions are as follows: Dimension Search: O-Ring, X-Ring and Back-Up Ring. - MM and Inch are both available. - Full standard O-Ring series: AS568, METRIC, JIS B2401 P / G / S / V, JASO F404, GB / T 3452.1, BS 4518 and SMS 1586. - Collocated Back-Up for AS-568 O-Ring. - Substitutable O-Ring sizes within tolerance are available. O-Ring Housing: Piston Sealing, Rod Sealing and Face Sealing. - MM and Inch are both available. - Support calculation for both Static and Dynamic sealing applications (Face sealing is with static calculation only). - Up to 7 O-Ring standards (AS568, METRIC, JIS B2401 P / G / S / V, JASO F404, GB / T 3452.1, BS 4518 and SMS 1586) for most of size requirement of different groove design.

Version history

3 versions are listed, going back to v3.0. Since v5.0.2 it requires Android 6.0+.

v5.0.2 LATEST Oct 2, 2026 12.1 MB TRUSTED v4.0 Sep 17, 2026 8.1 MB TRUSTED v3.0 Jun 8, 2024 8.1 MB TRUSTED

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Oct 2, 2026.
Certificate issued to “MasterHand” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Oct 2, 2026
Validated against Google Play Oct 2, 2026
Signed byCN=MasterHand, OU=MasterHand, O=MasterHand, L=Taipei, ST=TW, C=886
Signing certificate (SHA-1)72:8D:84:BB:EC:3E:75:8A:40:F2:FD:82:4F:38:B9:BB:2B:23:36:56
File MD53937adbde25b8e683d77b9f19105740e
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 (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (2)

O-Ring Master requests 2 permissions, none of them sensitive.

Full network access android.permission.INTERNET
Internal broadcast protection (app-defined) tw.com.masterhand.oringmaster.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Required hardware & features

Basic touch input android.hardware.faketouch
Portrait screen android.hardware.screen.portrait

O-Ring Master APK: questions and answers

Is there a version of O-Ring Master for older Android phones?

The current version needs Android 6.0 or later. Version 4.0 is the newest listed build that installs on Android 4.0.3 and later. Get version 4.0 · 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 O-Ring Master 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 2 other versions checked. After downloading, check that the file's MD5 is 3937adbde25b8e683d77b9f19105740e.