Torque is applied to the fastener in an effort to elastically deform the bolt shank. In the case of bolts and nuts, this elastic deformation between the bolt head and the nut is critical in order to create tension or clamping force to hold the joint together. The amount of torque applied is a function of the frictional forces and bolt diameter and is typically calculated utilizing a clamp load equaling 60-70% of the yield. Below are guides that show these calculations for a variety of materials, bolts sizes and thread counts over a range of frictional conditions. 

NOTE: The actual clamp load is dependent on a variety of factors including the material, condition of the fasteners, surface finish, lubrication etc. The percentages provided are illustrative of what one might expect to see should only be used as a general guide. *Yield strength used to calculate torque values are based on the typical yield.* 

 Torque Curve











CAUTION:  Care should be used when applying a formula for torque/tension relationships. Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury. All data included in this chart is advisory only and its use by anyone is voluntary. The data provided should be used as a guide, but actual material strengths and fastener conditions may vary.  In developing this information, Extreme Bolt & Fastener, LLC has made a determined effort to present its contents accurately. 

Fastenal. (2009). [Illustration of Tensile: Stress-Strain Relationship] Bolted Joint Design: Mechanical Properties of Steel Fasteners in Service.


Specialty Metal Torque Specs














 17-4 PH Torque Specification: H900 & H1150

 17 4 H900 Torque Specification


 17 4 H1150 Torque Specification


A-286 Torque Specification

A286 Torque Spec


AL-6XN Torque Specification

AL 6XNTorque Spec


Alloy 20 Torque Specification

Alloy 20



Alloy 330 Torque Specification

Alloy 330 Torque Specification



Duplex 2205 & 2507 Torque Specification

Duplex 2205 Torque Spec

Duplex 2507 Torque Spec



Hastelloy C276 Torque Specifications 

Hastelloy C276Torque Specification


Incoloy Torque Specifications

Incoloy 800 Torque Spec


Incoloy 825 Torque Specification

Incoloy 925 Torque Spec


Inconel 600, 625 & 718 Torque Specifications

Inconel 600 Torque Spec

Inconel 625 Torque Spec

Inconel 718 Torque Spec


Molybdenum Torque Specifications

MolybdenumTorque Specification

Molybdenum TZM Torque Specification

Molybdenum TZM Torque Specification

Monel 400 and K500 Torque Specifications

Monel 400 Torque Spec

Monel K500 Torque Spec

MP35N Torque Specifications

MP35N Torque Spec

Tantalum CP & 2.5%W Torque Specifications

Tantalum CP Torque Spec


Tantalum 2 5W Torque Spec

Titanium Gr2 & Gr5 Torque Specifications

Titanium Gr2 Torque Spec

Titanium Gr5 Torque Spec


Waspaloy Torque Specification

Waspaloy Torque Specification


Zirconium 702 & 705 Torque Specifications

Zirconium 702 Torque Spec

 Zirconium 705 Torque Spec

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