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
-Worklight (uses the flash on the iPhone 4/4S to illuminate your work)*
-Copy and paste data values
-Fast and easy unit conversion

Other improvements:
-Completely rebuilt code from the ground up for improved speed and efficiency
-Retina graphics
-Removed ads

If you have any questions please contact us at support@perfectlysimpleapps.com

*continued use of the flash may dramatically reduce battery life.