iPhone Screenshots


It includes the following features:

- Fits calculation: Upon entering the nominal diameter (of either bore or shaft), users select their tolerance classes for bore and shaft. The app then provides the complete ISO fits definition with all relevant values.
- Tolerances: Shows the tolerances for the most commonly used ISO tolerance classes.
- switch between metric and inch version.
- Charts: Shows the most common ISO tolerances classes in a diagram.
- Videos: Features the automatically updated latest TSS youtube videos.

The results of this application are based on DIN ISO 286

Nominal dimension:

following tolerances included:
Shaft: c11, d6, d9, d10, e8, e9, e13, f5, f6, f7, f8, g6, g7, h4, h5, h6, h7, h8, h9, h10, h11, h12, j5, j6, j7, js5, js6, js7, js9, k5, k6, k7, k11, k12, k13, m5, m6, m7, n5, n6, n7, p5, p6, p9, s6

Bore: E6, E7, E9, E11, E12, E13, F6, F7, F8, G6, G7,G8, H5, H6, H7, H8, H9, H10, H11, J6, J7, J8, JS6, JS7, JS9, JS8,K6, K7, K8, M6, M7, M8, N6, N7, N8, P6, P7, P8, P9

What's New

Version 3.4

Minor bug fixes

Ratings and Reviews

Iso fits


I loooooooooove this calculator!!!
For years I have used an physical one which I brought from Europe as a young engineer.
This one is identical but in a virtual package, fantastic tool.
Now if I could get the great folks at Trelleborg to create the companion to this, the calculator that allows one to roll the thread choice into one window and showing all the pertinent derived data in a table or window all would be right with the world and I could forgive the English for indoctrinating this country into the British Standard and once it was rooted deeply, they conveniently switched to the metric system.

excellent app


Thank you for making this app available. I find it to be incredibly useful when designing with holes and shafts. The Machinery's Handbook is nice, but this is even easier.

Mech. Engineer

Rockn' Roller

Accurate and easy to use, a great tool to have. I am using the application frequently and I am very pleased with its capabilities.


Trelleborg Sealing Solutions Germany GmbH
9.5 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Dutch, German, Japanese, Simplified Chinese, Spanish
Age Rating
Rated 4+
© 2012 Trelleborg Sealing Solutions
In-App Purchases
  1. Full Version with complete ISO286 Standard $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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