 
Active Pin Length
The pin active length l f is a length reduced by chamfering and filleting. The active length usually carries loading.
Formulas
Shear stress check
 
Contact pressure check
 
Interpretations of symbols in metric units:
| τ | shear stress [MPa] | 
| τ A | allowable shear stress [MPa] | 
| d | pin diameter [mm] | 
| p 1 | pressure in the top board [MPa] | 
| p 2 | pressure in the bottom board [MPa] | 
| p 1A | allowable pressure in the top board [MPa] | 
| p 2A | allowable pressure in the bottom board [MPa] | 
| s 1 | thickness of the top board [mm] | 
| s 2 | thickness of the bottom board [mm] | 
Interpretations of symbols in English units:
| τ | shear stress [psi] | 
| τ A | allowable shear stress [psi] | 
| d | pin diameter [in] | 
| p 1 | pressure in the top board [psi] | 
| p 2 | pressure in the bottom board [psi] | 
| p 1A | allowable pressure in the top board [psi] | 
| p 2A | allowable pressure in the bottom board [psi] | 
| s 1 | thickness of the top board [in] | 
| s 2 | thickness of the bottom board [in] |