One photo → fastener type, standard (DIN · ISO · UNC · NPT), size range and where to buy the replacement. The digital thread checker — honest answers, never made-up precision.
Technical beta. The labeled hardware-store set is tuning data, not release proof. Formal held-out results will be published only after Yakov's engineering verification.
No calipers, no thread charts, no guessing at the store counter.
Choose it in the app and tap the physical coin in the photo. The beta supports common US coins, 2 euro and 5 Russian rubles from an official-size catalog (a quarter is 24.26 mm).
The AI reads head shape, drive, thread profile and the coin next to your part — then matches it against real DIN/ISO/ANSI spec tables, not vibes.
A confident match, a short list of likely ones, or two smart questions — with a size range, never a fake decimal point.
Scanner apps die by guessing — users measure the part, catch the lie once, delete forever. BoltSnap tells you exactly how sure it is:
This level stays disabled in the technical beta. It will unlock only after the formal 100-part held-out gate proves the final result safe.
When look-alikes exist (M8 vs 5/16"), you see the actual alternatives with one-line differences instead of a hidden model guess.
Thread pitch can't be read from a photo — anyone claiming otherwise is guessing. We ask two smart questions or hand you a free printable gauge.
Every answer can export a 100%-scale printable gauge: diameter circles, metric pitch combs, TPI combs — with a built-in ruler and a quarter-circle to verify your printer didn't cheat.
Download the gauge (PDF, free)The two tables everyone googles from the garage. The app knows every row offline — but bookmarks are free.
| Wrench | Bolt | Pitch (coarse) |
|---|---|---|
| 8 mm | M5 | 0.8 |
| 10 mm | M6 | 1.0 |
| 13 mm | M8 | 1.25 |
| 17 mm | M10 | 1.5 |
| 19 mm | M12 | 1.75 |
| Wrench | Bolt | TPI (UNC) |
|---|---|---|
| 7/16" | 1/4" | 20 |
| 1/2" | 5/16" | 18 |
| 9/16" | 3/8" | 16 |
| 3/4" | 1/2" | 13 |
| ⚠ M8 and 5/16" look identical — that's the trap the app catches | ||
No — and neither can any app, that's optics. BoltSnap narrows it to the diameter, then settles pitch with one question or the printable gauge. Apps that claim pitch from a photo are the reason this category has one-star reviews.
Photos are processed once to identify your part and are not stored by BoltSnap. The optional contribution switch is per photo, off by default and local-only in this beta; nothing is uploaded automatically.
Scale is allowed only when your selected denomination, the tapped object and local multi-frame geometry agree with an immutable official-diameter catalog. An unknown coin or a model guess cannot unlock a size claim.
The first technical beta is free and has no paywall or subscription path.