Tap & Drill Size Chart
In the workshopThread engagement & clearance
Store name: “Tap & Drill Size Chart”
Coming soon
Not out yet — but it’s close.
Tap & Drill Size Chart is the machinist's pocket chart: every unified inch and common metric thread, the tap drill that fits it, the clearance drills
- 254 original, FAA-cited practice questions
- All 12 ACS General subject areas
- Timed 60-question exam simulator, 42 to pass
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What it is
The machinist's pocket chart. Pick any unified-inch or common metric thread and get the right tap drill at your chosen thread engagement, plus clearance drills and the full number, letter, fraction, and metric drill index. Reverse lookup answers the other question: which threads can this drill I own tap?
Why we built it
Every machinist, mechanic, and home-shop maker taps holes and ends up squinting at a greasy wall chart or Googling tap-drill sizes. Existing charts are fixed at 75% engagement and can't tell you what a drill you actually own will produce. This computes the answer for any engagement from 50 to 100 percent and reports the real resulting percentage, at the machine, offline.
Want one like this?
Tap & Drill Size Chart is one of 92. We can build yours.
Every app on the shelf started as one honest problem, scoped small and built native, end to end. That’s exactly how we approach client work — designed, built and shipped, without the bloat.
