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Bolt Threads Any Length Force to Strip Bolt Threads Formula and Calculator
Bolt & Screw Torque Charts and Equations
Force Required to Strip the Bolt Threads Any Length Formula and Calculator
The thread engagement length Le and the thread stress area ATS are directly proportional to each other. It is, therefore, very easy to compute stripping areas for engagement lengths other than nominal diameter, D:
When thread engagement is equal to thread diameter or when Le ≠ D
ATS' = ( Desired Le / D ) · ATS
Where
Le = Desired length of thread engagement (in., mm)
D = nominal diameter of the bolt (in., mm)
ATS = thread stress area (in2, mm2)
ATS
ATS' = Recalculated stripping area for a length of thread engagement greater to or less
than the nominal diameter of the fastener (D) (in2, mm2).
Equation 1
FSt = Su · ATS'
where
Su = ultimate shear strength (psi, MPa) of the nut or bolt materials
ATS = cross-sectional area (in.2, mm2) through which the shear occurs for a length of engagement equal to D
FSt = the force (lb, N) required to strip that length of threads of a bolt or nut
Tensile force required to break the bolt
Equation 2
FTen = UTS · AS
Thread Stress Area
Metric M Series Thread Stress and Shear Areas
UTS = ultimate tensile strength of the bolt material ( psi, MPa )
AS = the tensile stress area of the bolt ( in.2, mm2 )
D = nominal diameter of the bolt ( in., mm )
n = number of threads per inch
FTen = the tensile force required to break the bolt ( lb, N )
If the computed FSt is greater than FTen your deign is adequate.
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Reference:
Introduction to the Design and Behavior of Bolted Joints Non-Gasketed Joints, Forth Edition
Founding Editor
L. L. Faulkner
Columbus Division, Battelle Memorial Institute,
Department of Mechanical Engineering
The Ohio State University
Columbus, Ohio