iEngineer is the most comprehensive database of screw/bolt information that you can find anywhere.

US screws:
-93 different screws from #0 to 4”
-Dimensions for 9 standard head styles
-74 material grades including SAE, ASTM, and other materials

Metric Screws (available as in-app purchase):
-210 different metric screws from M1.0 to M100
-Dimensions for 10 standard head styles for ISO, DIN, BS, and ANSI standards where available
-86 material grades including 12 additional metric grades, SAE, ASTM, and other materials

Displayed values for both the US and Metric screws include:
-Standard dimensions
-Tap sizes
-Clearance hole sizes
-Material strength
-Recommended torque values
-Clamp force
-Shear force
-Head markings display
-3D model of head type
-Standard dimensions of head type

Other features:
-Drill chart with 523 drill bit sizes
-Fraction chart
-Copy and paste data values
-Fast and easy unit conversion
-Ability to show/hide material grades in the interface so you only see what is relevant to you

If you have any questions please contact us at

What’s New

Version 2.4

This app has been updated by Apple to use the latest Apple signing certificate.

- Updated with modern iOS design
- iOS 11 compatibility

Ratings and Reviews

4.5 out of 5
144 Ratings

144 Ratings

dcloin ,

Thank you so much

App has been updated and now works with IOS 11. Thank you for the update. I believe that this is the best app available for this source of material. I downloaded another similar app. For a much much higher price and while it may prove useful it falls short when compared to iEngineer. This app is quicker, more user friendly and has much more selections.

I highly recommend this app if you work with design, engineering or maintenance daily.

I’ve been a user for years and can’t imagine working without it.

SirBilliam ,

The glass is half bull

3 star=I like the app...

In my humble opinion this has real potential to be a winner.

We interrupt this profession of humility with an important yet judgmental review:
This was designed by a student engineer with little to no practical application of textbook data wasn't it? C'mon.... It's full of superfluous data that just ends up cluttering the display for about 95% of all skilled tradesmen in the field. On the other hand it's much easier to reference than your text during an open book exam. Yep, you guessed it, I'm no engineer and yet I downloaded an app, in that professions namesake. Joke's on me...
Still, for profitability sake, there are more skilled tradesmen than engineers anyway so why not market to them first? e.g. The calculator apps that are basic and scientific when rotated or mode select
1. Why didn't you include a hex flange head in the mix? That's like a margarita without tequila. Don't say it's the same as hex/washer because you better know better.
2. Substrate data anyone? Composites, steel alloys: ferritic/austenitic/martensitic; non-ferrous alloys you get the idea. If I'm going to fasten two identical materials, this will be enough. Unfortunately, it just never works out that way in the thunder dome.
3. Bolt Finish?- phosphor, zinc, chromate, cadmium, Jedi Juice... pertinent factors

Cat3612 ,

Great resource.

This app has gotten myself and subordinates out of numerous tight spots when torque was not listed in the governing documents. Really easy to use, great teaching tool.

I have been using this app for years, and it has yet to let me down when I needed information. Enjoy the white lettering on black background, really easy to see in various lighting conditions (even when the iPhone is in a sealed plastic bag, protection from seawater spray).

Fantastic app.

App Privacy

The developer, Perfectly Simple Apps LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


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