iPhone Screenshots


This application provides the user with detailed information about standard Screw Threads in both metric and imperial values.

Data includes a pictorial representation of the thread form, thread angles, depth of thread, height of thread, thread pitch, radius and crest sizes, major,minor and effective diameters, recommended tapping drill sizes and clearance drill sizes.

Simply double tap the screen to view the thread picker.
Select the thread form standard from the following options:-

Metric Coarse,
Metric Fine,

Select the thread size of interest from the available standard sizes.

The application will display the relevant thread data for screw cutting or thread milling, and the recommended drilling size for tapping operations.

Use the slider control to adjust the drill diameter to an available sized drill in metric, imperial or gauge standard, and see the corresponding effect on thread engagement, or select a desired thread engagement and see the drilling size recommended.

Toggle between metric and imperial results.

Swipe gestures simplify paging through the different threads.

Simple additional information on each thread standard is provided.

The drill standard tab allows the selection of gauge or imperial fractional drills, and shows the corresponding metric equivalent.

Ideally suited to Engineers, Machinist, Inspectors, Hobbyists, Apprentices, Designers and students of engineering, or others needing to drill and tap, thread mill or screw cut, the application provides convenient reference data without having to resort to an engineering handbook or manual.

Future releases will add more thread types and sizes, as well as further functionality to enhance the product.

Suggestions for improvement are gratefully received using the inbuilt report function.

What’s New

Version 2.1

Updated code and UI for the latest version of IOS.

Ratings and Reviews

2.7 out of 5
3 Ratings

3 Ratings

Igmyster ,


Every size I need info on is not there, better just stick to the machinist handbook!

Developer Response ,

Not sure what sizes you are looking for but all the most common thread forms and sizes are included
They are also clearly stated in the description on the AppStore
Sorry you bought something you didn’t need

Randalll1 ,

Great app👍👍

This app has provided everything I have asked it to. It has more thread dimensions than I will ever use. For a couple of dollars it cannot be beat. Also I do not like to soil my expensive reference material. With this app I can just give my phone a quick wipe down.

Deviidog ,


One of the worst apps. Would not allow you to change thread pitch when thread size has multiple pitches. Deleted it as fast as I put it on, was worthless to me.

Developer Response ,

This app contains all the common threads with their associated pitches
It does not handle variable pitches

App Privacy

The developer, superllanboy, 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.


  • Family Sharing

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

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