This SAE Aerospace Standard (AS) presents all appropriate boss dimensions from .125 inch to 2.0 inch tube sizes. Purpose: This AS has been developed for low pressure fuel systems and associated components operating up to 500 pounds per square inch (psi) as an alternate to MS33649 and MS16142(SH).
SAE AS1875A-2013 history
2013SAE AS1875A-2013 Boss@ Low Pressure (500 psi) Standard Dimensions For
2007SAE AS1875-2007 BOSS, LOW PRESSURE (500 psi) STANDARD DIMENSIONS FOR
1992SAE AS1875-1992 Boss, Low Pressure (500 psi) Standard Dimensions for