Minimum Bolt Spacing Calculator

✖Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part.ⓘ Nominal Bolt Diameter [d_b]

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✖Minimum Bolt Spacing is Minimum pitch (distance between centres of bolt holes) shall not be less than 2.5 times the nominal bolt diameter.ⓘ Minimum Bolt Spacing [b_s(min)]

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Formula

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Minimum Bolt Spacing

Formula

`"b"_{"s(min)"} = 2.5*"d"_{"b"}`

Example

`"3.75m"=2.5*"1.5m"`

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Download Design of Pressure Vessel Subjected to Internal Pressure Formulas PDF

Minimum Bolt Spacing Solution

STEP 0: Pre-Calculation Summary

Formula Used

Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter
b_s(min) = 2.5*d_b
This formula uses 2 Variables

Variables Used

Minimum Bolt Spacing - (Measured in Meter) - Minimum Bolt Spacing is Minimum pitch (distance between centres of bolt holes) shall not be less than 2.5 times the nominal bolt diameter.
Nominal Bolt Diameter - (Measured in Meter) - Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part.

STEP 1: Convert Input(s) to Base Unit

Nominal Bolt Diameter: 1.5 Meter --> 1.5 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

b_s(min) = 2.5*d_b --> 2.5*1.5

Evaluating ... ...

b_s(min) = 3.75

STEP 3: Convert Result to Output's Unit

3.75 Meter --> No Conversion Required

FINAL ANSWER

3.75 Meter <-- Minimum Bolt Spacing

(Calculation completed in 00.008 seconds)

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< 17 Design of Pressure Vessel Subjected to Internal Pressure Calculators

Coefficient Value for Thickness of Flange

Go Coefficient Value for Thickness of Flange = ((1)/((0.3)+(1.5*Maximum Bolt Loads*Radial Distance)/(Hydrostatic End Force in Gasket Seal*Diameter of Gasket at Load Reaction)))

Gasket Factor

Go Gasket Factor = (Total Fastener Force-Inside Area of Gasket*Test Pressure)/(Gasket Area*Test Pressure)

Longitudinal Stress (Axial Stress) in Cylindrical Shell

Go Longitudinal Stress for Cylindrical Shell = (Internal Pressure given Longitudinal Stress*Mean Diameter of Shell)/4*Thickness of Cylindrical Shell

Internal Presure of Vessel given Longitudinal Stress

Go Internal Pressure given Longitudinal Stress = (4*Longitudinal Stress*Thickness of Cylindrical Shell)/(Mean Diameter of Shell)

Wall Thickness of Pressure Vessel given Longitudinal Stress

Go Thickness of Shell for Longitudinal Stress = (Internal Pressure for Vessel*Mean Diameter of Shell)/(4*Longitudinal Stress)

Wall Thickness of Cylindrical Shell Given Hoop Stress

Go Thickness of Shell for Hoop Stress = (2*Internal Pressure given Hoop Stress*Mean Diameter of Shell)/Circumferential Stress

Internal Pressure of Cylindrical Vessel given Hoop Stress

Go Internal Pressure given Hoop Stress = (2*Circumferential Stress*Thickness of Cylindrical Shell)/(Mean Diameter of Shell)

Circumferential Stress (Hoop Stress) in Cylinderical Shell

Go Circumferential Stress = (Internal Pressure for Vessel*Mean Diameter of Shell)/2*Thickness of Cylindrical Shell

Maximum Bolt Spacing

Go Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5)

Hydrostatic End Force using Design Pressure

Go Hydrostatic End Force = (pi/4)*(Radial Distance^2)*Internal Pressure

Diameter of Gasket at Load Reaction

Go Diameter of Gasket at Load Reaction = Outside Diameter of Gasket-2*Effective Gasket Seating Width

Effective Thickness of Conical Head

Go Effective Thickness = Thickness of Conical Head*(cos(Apex Angle))

Hoop Strain

Go Hoop Strain = (Final Length-Initial Length)/(Initial Length)

Radial Distance from Gasket Load Reaction to Bolt Circle

Go Radial Distance = (Bolt Circle Diameter-Diameter of Gasket at Load Reaction)/2

Bolt Circle Diameter

Go Bolt Circle Diameter = Outside Diameter of Gasket+(2*Nominal Bolt Diameter)+12

Outside Diameter of Flange using Bolt Diameter

Go Outside Flange Diameter = Bolt Circle Diameter+2*Nominal Bolt Diameter+12

Minimum Bolt Spacing

Go Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter

Minimum Bolt Spacing Formula

Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter
b_s(min) = 2.5*d_b

What is Bolt?

A Bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut.

How to Calculate Minimum Bolt Spacing?

Minimum Bolt Spacing calculator uses Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter to calculate the Minimum Bolt Spacing, Minimum Bolt Spacing is minimum pitch (distance between centres of bolt holes) shall not be less than 2.5 times the nominal bolt diameter. Minimum Bolt Spacing is denoted by b_s(min) symbol.

How to calculate Minimum Bolt Spacing using this online calculator? To use this online calculator for Minimum Bolt Spacing, enter Nominal Bolt Diameter (d_b) and hit the calculate button. Here is how the Minimum Bolt Spacing calculation can be explained with given input values -> 3.75 = 2.5*1.5.

FAQ

What is Minimum Bolt Spacing?

Minimum Bolt Spacing is minimum pitch (distance between centres of bolt holes) shall not be less than 2.5 times the nominal bolt diameter and is represented as b_s(min) = 2.5*d_b or Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter. Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part.

How to calculate Minimum Bolt Spacing?

Minimum Bolt Spacing is minimum pitch (distance between centres of bolt holes) shall not be less than 2.5 times the nominal bolt diameter is calculated using Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter. To calculate Minimum Bolt Spacing, you need Nominal Bolt Diameter (d_b). With our tool, you need to enter the respective value for Nominal Bolt Diameter and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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