# O-Ring Master

> Offline tool for standard rubber seal sizes, including O-Rings, X-Rings, and Back-Up Rings. (iPhone/iPad app by GE MAO RUBBER INDUSTRIAL CO., LTD..)

- Source: https://appshunter.io/ios/app/o-ring-master/id1072051820 (this page in markdown: same URL + `.md`)
- Developer: [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 11 MB
- Languages: English, Japanese, Korean, Persian, Portuguese, Russian, Chinese, Spanish, Thai, Chinese and 2 more
- Released: 2016-01-12
- Data updated: 2026-07-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews.md

## What is O?

GMORS O-Ring Master is the completed tool for standard rubber seal sizes. 
When you use this APP, you don't need to have internet and catalog. Except O-Ring sizes, it also includes the search functions of X-Ring and Back-Up Ring. 
Otherwise, 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, BS 4518, GB/T 3452.1, JIS B2401 P, JIS B2401 G, JIS B2401 S, JIS B2401 V, SMS 1586 and METRIC.
- 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.

## Key features

- Offline standard rubber seal size selection
- Search for O-Ring, X-Ring, and Back-Up Ring sizes
- O-Ring housing calculations for sealing applications
- Supports multiple international standards (AS568, METRIC, JIS, etc.)
- Metric and Imperial unit support
- Substitutable O-Ring size suggestions


## Frequently asked questions about O

### What types of seals can O-Ring Master help me find?

O-Ring Master helps you find standard sizes for O-Rings, X-Rings, and Back-Up Rings. It covers a wide range of international standards to ensure compatibility with various applications.

### Does O-Ring Master require an internet connection to work?

No, O-Ring Master is designed to be used offline. You do not need an internet connection to access its full functionality, making it convenient for use in any location.

### What O-Ring standards does O-Ring Master support?

O-Ring Master supports numerous standards including AS568, BS 4518, GB/T 3452.1, JIS B2401 (P, G, S, V), SMS 1586, METRIC, JASO F404, and more. This extensive support ensures you can find seals for a vast array of requirements.

### Can O-Ring Master help with calculating seal housing?

Yes, O-Ring Master includes an O-Ring Housing feature. It supports calculations for piston sealing, rod sealing, and face sealing applications, accommodating both static and dynamic sealing scenarios.

### Does O-Ring Master offer measurements in both MM and Inch?

Yes, O-Ring Master provides support for both metric (MM) and imperial (Inch) measurements. This dual unit support makes it versatile for users working with different measurement systems.

### How often is O-Ring Master updated?

The latest version of O-Ring Master is 4.0.0, which was last updated on March 18, 2025. This indicates regular updates to maintain and improve the application's features and compatibility.

### What is the age rating for O-Ring Master?

O-Ring Master has an age rating of 4+. This means it is suitable for users of all ages and does not contain content that would be considered inappropriate for children.

### What devices is O-Ring Master available on?

O-Ring Master is available for iPhone and iPod devices. It is designed to run on Apple's mobile operating systems.

## Version history (last 5 releases)

### 4.0.0 — 2025-03-18

Regular maintenance and performance improvements.

### 3.2 — 2023-01-05

Update standard size
New language versions (Chinese, Taiwanese).
Optimizations and performance improvements.

### 3.1 — 2022-12-29

Optimizations and performance improvements.

### 3.0 — 2022-08-17

Optimizations and performance improvements.

### 2.3 — 2020-05-04

1. Build with the iOS 13 SDK
2. Use an Xcode storyboard to provide the app's launch screen

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## More apps by GE MAO RUBBER INDUSTRIAL CO., LTD.

- [Material Master](https://appshunter.io/ios/app/material-master/id1253339380)

All apps by GE MAO RUBBER INDUSTRIAL CO., LTD.: https://appshunter.io/developer/1078558543

## Related topics

[mast ge](https://appshunter.io/ios/topics/mast-ge) · [ringmaster](https://appshunter.io/ios/topics/ringmaster)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-01.*