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By Perfectly Simple Apps LLC

This app is only available on the App Store for iOS devices.


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 in Version 2.4

- Updated with modern iOS design
- iOS 11 compatibility


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iPad Screenshot 1

Customer Reviews

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.

Fantastic app

I have been using this app practically since it was first released. It is the best app for getting all the info you need about bolts and screws - including metric ones. The clean interface has been made even better with the iOS 11 update. It is no a machinist bible and does not pretend to be one. If you just need info on a bolt, what through hole or tap hole to drill, fraction to decimal conversions, etc. this is the best you'll find.


This app is fantastic. I couldn’t wait for this to get updated to iOS 11 It drove me crazy not being able to use it. I do design work and I’m in the tool and die industry I use this all the time it is so handy. Great app, great job!

View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Reference
  • Updated:
  • Version: 2.4
  • Size: 27.9 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. Metric Screws$1.99