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### Thread Shear Area Formulas and Calculator per. ASME B1.1

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Thread Shear Area for External and Internal Formulas and Calculator per. ASME B1.1

The following formulas for thread shear areas are geometric minimum values. Shear ( thread stripping) strengths of screw threads under load are dependent, in addition, on mating component relative material strengths, nut geometry, and coefficient of friction between thread bearing surfaces. Effective shear areas are therefore somewhat less than the geometric values.

Preview- Thread geometric shear areas calculator

Thread geometric shear areas:

Eq. 1

AS_{n} = π ( 1 / P ) ( LE) dmin
[ 1 / ( 2 (1/P) ) + 0.57735 ( dmin. - D_{2}max. ) ]

Eq. 2

AS_{s} = π ( 1 / P ) ( LE) dmin
[ 1 / ( 2 (1/P) ) + 0.57735 ( d_{2}min. - D_{1}max. ) ]

For thread dimensional data see:

External Screw Thread Pitch, and Major Diameter Data

Internal Screw Thread Pitch, and Major Diameter Data

where

AS_{n} = minimum thread shear area for internal
threads

AS_{s} = minimum thread shear area for external
threads

1/P = number of threads per inch

LE = length of engagement

dmin. = minimum major diameter of external
thread

d_{2}min. = minimum pitch diamter of external thread

D_{1}max. = maximum minor diameter of internal
thread

D_{2}max. = maximum pitch diameter of internal
thread

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