2.563" overall length 18 single pressure connection thread quantity per inch weapon system essential cylindrical w/bracket npt single pressure connection thread series
3a single pressure connection thread class 7.250" overall length 0.438" single connection outside diameter 6.375" overall width 20 single pressure connection thread quantity per inch rectangular w/bracket unf single pressure connection thread series
2a single mounting facility thread class 1.576" overall length 0.625" overall width 32 single mounting facility thread quantity per inch edged strap, stud mounting open top unc single mounting facility thread series