KATO Fastening Systems, the original inventor and manufacturer of the bi-directional Tangless® CoilThread® insert, is introducing the next version of the most powerful product search App for helical coil screw thread inserts and tools.

More than just an update, this release is completely new. Optimized for the latest iOS, and is natively compatible for both iPhone and iPad!

Built into the KATO App is the most comprehensive database on helical coil screw thread inserts. With four search options (KATO Part Number, Style & Size, MS/MA Number and NAS/NA Number), the KATO App makes it extremely easy to locate product & technical information, and tooling options for any Tangless or tanged screw thread insert!

Tooling suggestions include:
- Air Tools
- Electric Tools
- Manual Installation Tools
- Removal Tools

Technical information includes:
- Military & Aerospace Part Numbers (NAS1130, NA0276, NASM21209, MS122 & MS124 Series, MA3329, MA3330, MA3331, MA3379, MA3380, and/or MA3381)
- Free O.D. Dimensions
- Number of Free Coils
- Hole Preparation Procedures
- Suggested Drill Sizes
- Drilling Dimensions (per NASM33537)
- Tapping Dimensions (per NASM33537)
and more…

What's New

Version 2.4

Bug fixes and performance improvements

Ratings and Reviews


Excellent Tool for Engineers

This App is very handy for converting MS and NAS part numbers. I have not been able to find any other App that is as easy to use and as versatile when working with helical coil screw thread inserts and tooling. The KATO website is also a winner and when combined with the App are high tech tools very useful for design engineers.


Fast, Clean, and Simple

This is a really great App for quickly looking up information on helicoils. I use the KATO App regularly.

The user interface is very clean. The app is very responsive, results are instantaneous, and using the app is very easy... nice job.

The Baouse

Perfect insert & tooling lookup

This app is great for tooling options for Tangless inserts. Also, really helpful for STI thread info.


KATO Fastening Systems
54.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© KATO Fastening Systems, Inc. All rights reserved.


  • Family Sharing

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

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