Observed arrival · 2026-10-17
A bolt-torque calculator that shows its work
A free, in-browser calculator estimates tightening torque or clamping force, then checks the result against bolt-grade strength and preload targets.
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People sizing and tightening metric or imperial bolts
- Worth noticing
- The page limits its listed K-factor guidance to bolts from 1/4 inch to 1 inch (M6–M24) and advises testing hardware outside that range.
Field notes
Inputs cover bolt material and finish, diameter and thread series, lubrication, and unit system. The displayed strength check also uses bolt grade, a target percentage of yield, and grip length to estimate stress, preload, and elongation. The site links to companion shear and weight calculators; its shear-calculator description names single and double shear, thread condition, bolt count, and safety factors.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
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