Vacuum Cups and Suction Cups Vacuum Cup Fittings – Male-to-Male Connection AdaptersPart Number: HSHN5 Vacuum Fitting Part No. Connection Thread Size Thru Hole Diameter in. (mm) Hex Size in. (mm) LHeight Added to Assembly in. (mm) HHeight in. (mm) HSHN5 M5 (5mm) male – M5 (5mm) male 0.09 (2.3) 0.31 (8.0) 0.18 (4.6) 0.45 (11.0)