Vacuum Cups and Suction Cups Vacuum Cup Fittings – Male-to-Male Connection Adapters Male-to-Male Connection Adapters: Product Photo (Click to Enlarge) Vacuum Fitting Part No. Connection Thread Size Thru Hole Diameter or Thread in. (mm) Hex Size in. (mm) LHeight Added to Assembly in. (mm) HHeight in. (mm) The HSHN5 fitting is a double male 5 mm thread connector HSHN5 M5 (5 mm) male – M5 (5 mm) male 0.09 (2.3) 0.31 (8.0) 0.18 (4.6) 0.45 (11.0) The “G” thread is also known as BSPP, commonly used world-wide for Vacuum Applications. Other Adapter Fittings for Other Connections: Group 1 Vacuum Cup Fittings Group 2 Vacuum Cup Fittings Group 3 Vacuum Cup Fittings Female-to-Female Adapters Female-to-Male Adapters