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# Bolt Tensioner Application

• 50% Tool Coverage

• 100% Tool Coverage

### Important formula:

Residual Bolt Load Bolt Stress x Bolt Tensile Stress Area (Bolt Stretch x Modulus of Elasticity x Bolt Tensile stress area)/ Effective Length. (3.14 x D X D) / 4 (D is smallest Stress Dia of Bolt) (Bolt Stress Required / Yield Strength of bolt) x 100 (Residual Bolt Load x Load Relaxation Factor) / Hydraulic Area of Load Cell. 1.01 + (Bolt Size (Dia.) / Effective Length) or 1.1 which ever is greater.

### Basic Calculation and Working:

• Calculate Bolt Residual Load: Residual Load can be calculated from known stress or bolt stretch requirement.
• Calculate Load Relaxation factor using Bolt Dia and Effective Length. It can be calculated from below formula / Chart.
• Calculate application hydraulic load.
• Calculate hydraulic pressure for required hydraulic load.
• Select Tensioning Procedure. (25%, 50%, 100%...etc.)
• Calculate pass load as applicable. (Max applied load should never exceed 95% bolt yield strength). ### Useful Conversions:

Area Load (Force) 1 millimeter2 (mm2 ) = 0.00155 inch2 1 centimeter2 (cm2 ) = 0.155 inch2 1 inch2 = 645.16 mm2 1 inch2 = 6.4516 cm 1 Metric Ton (mt) = 1.10231 Short Ton (US) 1 Kilo Niwton, kN = 224.8089 lb 1 Metric Ton (mt) = 9.8066 kN 1 mt = 0.9842 Long Ton (UK) 1 kN = 0.0958 mt 1 st = 0.0958 mt 1 Megapascal (MPa) = 10 Bar 1 Kg per cm2 (Kg/cm2 ) = 0.98066 Bar 1 bar = 14.5037 psi 1 bar = 1.0197 Kg/cm2 1 Megapascal (MPa) = 10 Bar 1 bar = 14.5037 psi