F Numbers

C-Spec Tools

Quick lookup of filler metal groupings

Downloads: 1K+; on Google Play
Price: Free; No in-app purchases
Updated: Jul 29; 2026 · v2.2.1

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About F Numbers

F Numbers: Quick lookup of filler metal groupings for welding procedure and performance qualification. Lookup includes classifications with respective descriptions of intended use. Data is provided by C-spec. F-numbers and A-numbers assignments are based on ASME Section IX Table QW-432 and QW-442, ASME Section II Part C, AWS B2.1 Table B1 and B2, and AWS A5.1 through AWS A5.36.

What’s new

Version 2.2.1 · Updated July 29, 2026

Updated the app to target Android 16 (API level 36) to comply with the latest Google Play requirements.

App details

F Numbers is a free Tools app for Android with 1,000+ installs on Google Play. It was released on June 3, 2024 and last updated on July 29, 2026. It's developed by C-Spec. It requires Android 5.1 or later.

Category: Tools
Installs: 1,000+
In-app purchases: No
Ads: No ads
Version: 2.2.1
Requires Android: 5.1
Content rating: Everyone
Released: June 3, 2024
Last updated: July 29, 2026
Developer: C-Spec

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