Bolt Torque Calculator — The Complete Guide: Tightening Torque and Preload for Free
The tightening torque calculator by ADIT is a small, focused tool: you enter the bolt size, the strength grade and the friction condition, and it returns the tightening torque and the preload that torque produces in the bolt. It runs in the browser, with a Hebrew interface, nothing to install and no registration.
Nut and bolt tightening torque calculator
ADIT Ltd (ADIT)
Works out the tightening torque for a bolted connection, in the browser.
Get it from the vendorWhat you get
- Bolt size — the diameter as the starting input.
- Strength grade — which governs the preload the bolt can take.
- Friction condition — the factor that changes the result more than anything else.
- Tightening torque — a figure for a drawing or a work instruction.
- Preload — the force the torque actually creates in the bolt.
Tip: friction decides
The link between torque and preload depends heavily on friction in the thread and under the head. The same torque on a lubricated bolt and on a dry one gives different forces, so pick the friction condition that matches what will really happen on site.
Related tools
For designing bolted steel connections — ConSteelSoft. For connections and fixings in steel structures — STEELSOFT. For anchoring into concrete — AAS.
ConSteelSoft — structural steel connection design
ADIT Ltd (ADIT)
Designs bolted and welded connections in structural steelwork.
Get it from the vendor
STEELSOFT — steel connection design
ADIT Ltd (ADIT)
Designs connections and fixings for steel structures.
Get it from the vendor
AAS — concrete anchor design
ADIT Ltd (ADIT)
Designs anchors into concrete for the full range of failure modes.
Get it from the vendorThe bottom line
Instead of guessing a torque value, the calculator gives you a reasoned figure in seconds — free and in the browser.
Disclosure: the owner of this site also owns ADIT.