iEngineer 4+

Perfectly Simple Apps LLC

Designed for iPad

    • 4.5 • 166 Ratings
    • Free
    • Offers In-App Purchases



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 display the Apple Watch app icon.

- Updated with modern iOS design
- iOS 11 compatibility

Ratings and Reviews

4.5 out of 5
166 Ratings

166 Ratings

GillesV27 ,

Great useful app with some small errors

The app is very useful and convenient to use. I would give it a 5 star review, if it wasn’t for a few errors that can be easily rectified.
For metric bolts of class 10.9 and 12.9 the proof strength is lower than what’s specified in the standards. Additionally, the calculation of the tensile stress area for all metric bolts is a bit off. Those two factors together leads the app to suggest a torque figure that’s lower than it should be. There’s an error in the tensile area calculation for SAE bolts too, but here it’s small enough to not really affect the suggested torque.

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

Sniper Motorsports ,

Great App for a hobbyist

I’m a hobbyist who machines and fabricates for my own projects. This app is very handy for me. It saves me from looking up screw dimensions in handbooks and walking to where I keep a drill chart. I do wish it had a tap drill table, that’d save me even more time. I read a review which mentioned tensile strength of some fasteners being different than other references. I haven’t compared those in the app to other references. I only use the dimensions and haven’t, so far, found any discrepancies. Good eye to the reviewer who caught those.

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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