Minor Diameter of Bolt Given Working Strength Calculator

Formula Used:

\[ d2 = \frac{\sqrt{(d1^2 - dgb^2) \cdot ps}}{\sqrt{i \cdot 68.7}} + \frac{4 \cdot F\mu}{3.14 \cdot i \cdot 68.7} \]

Outside Diameter of Seal Ring (d1):

Nominal Diameter of Metallic Gasket Bolt (dgb):

Fluid Pressure on Metallic Gasket Seal (ps):

Number of Bolts in Metallic Gasket Seal (i):

Friction Force in Metallic Gasket (Fμ):

Minor Diameter of Metallic Gasket Bolt (d2):

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1. What is the Minor Diameter of Bolt Given Working Strength Formula?

The Minor Diameter of Bolt Given Working Strength formula calculates the core diameter of bolts used with metallic gasket seals, taking into account various mechanical factors including fluid pressure, friction forces, and the number of bolts in the assembly.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ d2 = \frac{\sqrt{(d1^2 - dgb^2) \cdot ps}}{\sqrt{i \cdot 68.7}} + \frac{4 \cdot F\mu}{3.14 \cdot i \cdot 68.7} \]

Where:

\( d2 \) — Minor diameter of metallic gasket bolt (m)
\( d1 \) — Outside diameter of seal ring (m)
\( dgb \) — Nominal diameter of metallic gasket bolt (m)
\( ps \) — Fluid pressure on metallic gasket seal (Pa)
\( i \) — Number of bolts in metallic gasket seal
\( F\mu \) — Friction force in metallic gasket (N)

Explanation: The formula accounts for the mechanical stresses and forces acting on the bolt assembly in a metallic gasket seal configuration.

3. Importance of Minor Diameter Calculation

Details: Accurate calculation of the minor diameter is crucial for ensuring proper bolt strength, preventing mechanical failure, and maintaining seal integrity under various pressure conditions.

4. Using the Calculator

Tips: Enter all values in appropriate units (meters for diameters, Pascals for pressure, Newtons for force). Ensure all values are positive and the number of bolts is at least 1.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the 68.7 constant in the formula?
A: The 68.7 constant represents a conversion factor or material property constant specific to metallic gasket bolt calculations.

Q2: How does fluid pressure affect the minor diameter calculation?
A: Higher fluid pressure increases the stress on the bolts, requiring a larger minor diameter to maintain structural integrity.

Q3: What happens if the friction force is zero?
A: If friction force is zero, the second term of the equation becomes zero, and the calculation is based solely on the pressure and geometric factors.

Q4: Why is the square root function used in this formula?
A: The square root function accounts for the non-linear relationship between pressure, geometry, and the resulting stress distribution.

Q5: Are there limitations to this calculation method?
A: This formula provides an estimation and should be verified with engineering standards and specific material properties for critical applications.