Work out the tap drill size for a metric or imperial thread at a chosen percentage of thread engagement.
Thread Pitch Calculator works entirely in the browser tab. Open it, use it, close it. Nothing about the session outlives the page.
Everything runs client side, which is the only arrangement where a privacy claim is checkable. Open the network tab and watch it stay empty.
You will find it under Engineering, alongside 8 other tools for the same sort of job.
Runs in this tab, so nothing you type is uploaded.
system: metric majorDiameterMm: 10 pitchMm: 1.5
Tap drill diameter mm: 8.5386 Tap drill diameter inches: 0.3362 Pitch mm: 1.5 Threads per inch: 16.9333 Major diameter mm: 10 Major diameter inches: 0.3937 Engagement percent: 75
Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.
No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.
Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.
Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.
Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.