Bolt Bit

Pearl Vista Play Studio

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About this app

A torque figure on its own says nothing about whether the joint is tight. Bolt Bit turns the number 🔢 on your wrench into the thing that actually matters: the clamp force in the bolt, and how close that is to yield.

THE PRELOAD BENCH
Enter the torque and read the preload out — in kilonewtons, with the percentage of yield next to it. Drag ✋ the torque slider and the whole picture moves: the working line climbs, the marker walks up the chart 📊, and you can see 👀 the proof and yield limits it is heading for. The bench also tells you how much further you can go before the bolt stalls at yield, so the margin is a number 🔢 rather than a feeling.

FRICTION IS THE VARIABLE THAT DECIDES
The same torque produces wildly different clamp depending on what is happening in the threads and under the head. Set the condition — from well lubricated through dry to galled — and the curve redraws. It is the honest answer to why ❓ the same setting works on one joint and strips another.

YOUR FASTENER, NOT A GENERIC ONE
Choose diameter and pitch and the property class — 8.8, 10.9, 12.9 — and every figure is computed for that bolt: proof load, yield, the stress area behind it. Change the grade and the limits move where they should.

TARGET BANDS 🎯
Common practice 🏋️ bands are built in — 60 to 85 percent ％ of yield, 70 to 90 — shown as a shaded region on the chart 📊, so you can see 👀 at a glance whether your setting lands inside the band or short of it.

THE REGISTER
Save 💾 a joint as a spec — bolt, friction condition, target 🎯 torque and the preload it gives — and keep them in a register you can come back to on the next assembly instead of recomputing from scratch.

Runs entirely on your device 📱: no account, no connection, nothing sent anywhere.