Related Resources: calculators

Thread Yield and Tensile Strength Equation and Calculator

Fastener and Screw / Bolt Design, Formula and Calculations

The following Equation and Calculator will determine the working loads base on the ultimate yield strength threaded connections.

ALL calculators require a Premium Membership

Ultimate Strength of a thread

y_min = s_yield x a

---

Ultimate Tensile Strength of a thread

s_tensile = t_min x a

---

Shear Strength of a thread

S_sy = p_r x s_yield

---

Where:

y_min = Minimum Yield of bolt threads engaged (lbs)

s_yield = Minimum yield strength of the bolt grade, ASTM, SAE, etc. (psi)

s_tensile = Ultimate Yield Strength (lbs)

t_min = Minimum tensile strength of the bolt grade, ASTM, SAE, etc. (psi)

S_sy = Working axial load of fastener bolt (lbs)

a = Stress area of thread (in²)

p_r = Percent expressed as decimal, e.g. 60% = 0.6 - This is the factor of safety (FOS) for the design application

Related:

• Threaded Hole Fastener Pullout Stress
• Self Tapping Screw Pull-Out and Torque Calculator
• Torque Clamp Force Calculator
• Stud Preload Calculator
• Bolt Preload Tension Equation and Calculator
• Bolt Preload Tension Force Calculator
• Torque vs Tension Bolts Table Chart SAE J429 Bolts