Free

Details

Released
December 8, 2011
Updated
October 28, 2026

Features

O-Ring screenshot #1 for iPhone
O-Ring screenshot #2 for iPhone
O-Ring screenshot #3 for iPhone
O-Ring screenshot #4 for iPhone
O-Ring screenshot #5 for iPhone
O-Ring screenshot #6 for iPhone
iphone
ipad
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About

This app helps users calculate O-ring dimensions and find suitable O-ring sizes based on installation specifications. It supports metric and inch measurements and offers chemical compatibility checks for various media.

βœ“O-Ring housing calculation
βœ“O-Ring size recommendation
βœ“Quick search by international standards
βœ“Tolerance calculation
βœ“Metric and inch unit switching
βœ“Chemical compatibility check
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What's New in O

5.0

October 28, 2026

Updated for compatibility with the latest iOS version

User reviews

Useless

Unfortunately useless
Don’t bother with it

App not working

I've just found out the latest app does not open on my iPod touch running IOS 5.1.1 (earlier ones worked ok)
It works fine on my iPad which is running the latest operating system.
I can't see any comments that state it wouldn't work on the iPod but even after removing it and downloading it again it's still not opening.
Normally apps won't download if the wrong version operating system is running. Does anyone have any ideas?
Thanks,
John.
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Great app!

Really useful app for specifying o-rings. Almost as good as Trelleborg's superb web based o-ring calculator.

Great Tool For Engineers

As a mechanical engineer, I find this app very useful. I use it at least once a week. The layout of the app is very easy to work with and intuitive. A must have app for all engineers and for anyone who works with o-rings. Thanks Trelleborg for spending the time on this app.

Quick reference.

This is a great tool for quickly calculating o-ring sizes. I've mostly used the "quick search" to determine standard sizes.

Developer apps

FAQ

What is the O-Ring app used for?

The O-Ring app is used to calculate O-ring dimensions and recommend suitable O-ring sizes based on your installation specifications. It also checks for chemical compatibility with your application's media.

Does the O-Ring app support both metric and imperial units?

Yes, the O-Ring app allows you to easily switch between metric and inch measurements for your calculations and specifications.

What O-ring standards does the O-Ring app support?

The app supports O-ring nominal sizes according to ISO 3601-1 Class B (International), ISO 3601-1 Class A (AS 568, USA), NFT 47-502 (France), JIS B 2401 (Japan), and SMS 1586 (Sweden).

Can the O-Ring app help me determine the correct material for my O-ring?

Yes, the O-Ring app includes a chemical compatibility check feature that helps you find out which materials are compatible with the media used in your application.

What is the rating of the O-Ring app?

The O-Ring app has a rating of 3.8 stars from 5 ratings.

Is the O-Ring app available on Android devices?

Based on the provided information, the O-Ring app is supported on iPhone and iPad, but compatibility with Android devices is not specified.

How often is the O-Ring app updated?

The O-Ring app was last updated on October 28, 2026, indicating a recent update. The initial release date was December 8, 2011.

Does the O-Ring app have ads?

No, the O-Ring app does not contain advertisements.