Tools · Bolting

Bolt torque calculator

Estimate the order of magnitude of the tightening torque to size the tool. Metric (ISO) and imperial (UN/UNC) fasteners.

Disclaimer — read before use

  • The result is purely indicative and only serves to size the tool and recognise an order of magnitude. It is not a tightening specification.
  • The tightening torque is a design datum of the joint: it is set by the flange designer, the gasket manufacturer, the plant builder (OEM) or the applicable procedure (e.g. ASME PCC-1, VDI 2230) — not by the tool supplier.
  • The actual preload depends on friction, lubrication and thread condition: with torque control alone the scatter is in the order of ±25–30%. Always follow the values and sequence prescribed by the design or the standard.
  • Maucotools accepts no liability for the use of the values calculated here.

Pre-filled from the choice above — editable.

Indicative tightening torque

1,083Nm

≈ 799 ft·lb

Target preload

328 kN

Yield load

505 kN

Resistant area Aₛ

561.0 mm²

K used

0.11

Rp0.2 900 MPa · D 30 mm · 65% of yield

Indicative value to size the tool — not a tightening specification. Always follow the design datum or the standard (ASME PCC-1 / VDI 2230).

Method: bolt → strength → resistant area → target % → torque (T = K · D · F).