Bolt & Nut Torque calculator , Tightening torque calculator , Bolt tightening torque , Nut tightening torque calculator , Bolt Toque calculator , Nut torque calculator , Mechanical Pradhan

DEVELOPED BY MECHANICAL PRADHAN

Understanding Tightening Torque

Tightening torque is the rotational force applied to a fastener to create a clamping force, or tension. Think of it as the twisting effort you use with a wrench. This tension is what holds parts together securely. It's not just about making the fastener "tight"; it's about stretching the bolt like a spring to create a strong, reliable connection.

Why is it so Important?

Proper torque is critical for safety and reliability. If the torque is too low, the fastener can loosen over time due to vibrations, leading to leaks or complete failure. If it's too high, you risk stripping the threads or breaking the bolt, permanently damaging the parts.

Benefits of Correct Torque

Applying the correct tightening torque ensures maximum clamping force, creating the strongest possible joint. It prevents parts from shifting under load and ensures the connection remains durable and safe throughout its service life.

Precise Fastener Torque Calculator

Calculate torque for bolts and nuts.

Developed by Mechanical Pradhan

Select Fastener Type

Bolt Nut

Common Sizes (Metric) Select a preset... M6 x 1.0 M8 x 1.25 M10 x 1.5 M12 x 1.75 M14 x 2.0 M16 x 2.0 M20 x 2.5 M22 x 2.5 M24 x 3.0 M27 x 3.0 M30 x 3.5 M33 x 3.5 M36 x 4.0 M39 x 4.0 M8 x 1.0 M10 x 1.0 M10 x 1.25 M12 x 1.25 M12 x 1.5 M14 x 1.5 M16 x 1.5 M18 x 1.5 M20 x 1.5 M22 x 1.5 M24 x 2.0 M27 x 2.0 M30 x 2.0 M33 x 2.0 M36 x 3.0 M39 x 3.0

Bolt Property Class Custom Clamp Force 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9

Nut Property Class Custom Clamp Force 04 05 5 6 8 9 10 12

Nominal Diameter (D)

mm

Thread Pitch (P)

mm

Target Clamp Force (F)

N

Auto-fills to 80% of proof load, but you can override it.

Friction Settings

Min CoF (μ)

Max CoF (μ)

Thumb Rules for Torque Calculation

1. Always use a calibrated torque wrench. 2. Ensure threads are clean and free of damage. 3. Apply torque in a smooth, continuous motion. 4. For multiple fasteners, use a star or cross pattern for tightening sequence.

Calculation Results

Proof Load

- N

Min. Ultimate Tensile Load

- N

Minimum Torque

- Nm

Maximum Torque

- Nm

Chemical Composition (Bolt)

C min: -

C max: -

P max: -

S max: -

B max: -

Temp. Temp. min: -

Hardness (Bolt)

Vickers (HV)

- - -

Brinell (HBW)

- - -

Rockwell (HRC)

- - -

Chemical Composition (Nut)

C max: -

Mn min: -

P max: -

S max: -

Temp. Temp. min: -

Hardness (Nut)

Vickers (HV)

- - -

Brinell (HBW/HB)

- - -

Rockwell (HRC/HRB)

- - -

Developed by Mechanical Pradhan