# Thread Data > Reference app for standard screw thread data and drill size calculations. (iPhone/iPad app by superllanboy.) - Source: https://appshunter.io/ios/app/thread-data/id550463158 (this page in markdown: same URL + `.md`) - Developer: [superllanboy](https://appshunter.io/developer/439292731) - Category: Reference, Utilities - Price: $1.99 - Rating: 2.70/5 from 3 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 2 MB - Languages: American English - Released: 2012-08-15 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/thread-data/id550463158/reviews.md ## What is Thread Data? 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:- BA, BSW, BSF, Metric Coarse, Metric Fine, UNC, UNF, UNEF, BSP, BSPT, NPT, Pg, G, 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. 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, Machinists, Inspectors, Hobbyists, Apprentices, Designers and engineering students, or others needing to drill and tap, or Screwcut, the application provides convenient reference data without resorting 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. ## Key features - Detailed screw thread information (metric/imperial) - Pictorial thread form representation - Thread angles, depth, pitch, and diameters - Recommended tapping and clearance drill sizes - Adjustable drill diameter for thread engagement - Toggle between metric and imperial units ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/thread-data/id550463158/reviews.md ### 5/5 — Great little app *2023-07-23, version 3.0.1* So convenient having screw cutting info at hand with just a few spins of the selection wheel I’ve used this since it was first released and like the new look Loads of threads added but I mostly refer to the metric ones Just hope they add Acme soon ### 5/5 — Great app👍👍 *2019-02-15* 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. ### 1/5 — Poor *2018-11-11, version 2.1* Don’t bother all sizes are in imperial for a metric app this is rubbish ### 1/5 — Terrible *2017-05-09* 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 ### 5/5 — Estimator *2014-05-01, version 1.0* If you are a mechanical engineer this app is a must ### 1/5 — Inspector *2013-05-28* 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 ### 4/5 — Good *2012-11-02* Is very good but would be better if it showed internal bore dimensions and internal tread dimensions for NPT and BSPT. ## Frequently asked questions about Thread Data ### What thread standards does Thread Data support? Thread Data supports a wide range of standards including BA, BSW, BSF, Metric Coarse, Metric Fine, UNC, UNF, UNEF, BSP, BSPT, NPT, Pg, and G. This comprehensive selection ensures coverage for most common engineering and machining needs. ### Can I adjust drill sizes and see the effect on thread engagement in Thread Data? Yes, Thread Data features a slider control that allows you to adjust the drill diameter. You can then see the corresponding effect on thread engagement, or conversely, select a desired thread engagement to see the recommended drilling size. ### Does Thread Data offer both metric and imperial measurements? Absolutely. Thread Data allows you to toggle between metric and imperial results for all relevant measurements. It also includes a drill standard tab to select gauge or imperial fractional drills and see their metric equivalents. ### What information is provided for each thread standard in Thread Data? For each thread standard, Thread Data provides a pictorial representation of the thread form, thread angles, depth, height, pitch, radius, crest sizes, major, minor, and effective diameters. It also includes recommended tapping and clearance drill sizes. ### How often is Thread Data updated? The application was last updated on July 26, 2023, with version 3.0.2. Future releases are planned to add more thread types, sizes, and functionality, indicating ongoing development and support. ### What is the price of Thread Data? Thread Data is a paid application, available for $1.99. This one-time purchase provides access to all current features and future updates. ### Is Thread Data available on Android devices? Based on the provided data, Thread Data is supported on iPhone, iPad, and iPod. Information regarding Android compatibility is not available in this data set. ### What is the user sentiment for Thread Data based on ratings? Thread Data has a rating of 2.7 stars from 3 ratings. This suggests that while some users find the app useful, there may be areas for improvement based on overall user satisfaction. ## Version history (last 4 releases) ### 3.0.2 — 2023-07-26 Minor update to add links to other Apps Updated some icons. Added more detail on some information screens. ### 3.0.1 — 2023-07-23 Interface improvements and support for Light and Dark Mode. Interface improvements to accommodate large-format iPad screens. Added additional thread types for Metric Spark Plug, Metric Conduit, Metric Special Pitch, Pg type conduit and G-type gas threads. The app now defaults measurements to the thread standard dimensions metric / Imperial with the option to switch the display to the alternate dimension. The code base is now changed to Swift for future compatibility with new iPhone releases. Fixed display to accommodate newer screen sizes and resolutions. ### 2.1 — 2016-01-26 This app has been updated by Apple to display the Apple Watch app icon. Updated code and UI for the latest version of IOS. ### 1.0 — 2012-08-15 No release notes. ## More apps by superllanboy - [ISO Tolerance](https://appshunter.io/ios/app/iso-tolerance/id493852664) - [Trig Calculator](https://appshunter.io/ios/app/trig-calculator/id496367309) - [Surface Finish](https://appshunter.io/ios/app/surface-finish/id498813301) All apps by superllanboy: https://appshunter.io/developer/439292731 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*