Vacuum Cups and Suction Cups Product Photo (Click to Enlarge) Vacuum Cup Part Number and Material D Overall Dia. in. (mm) d Fitting Dia. in. (mm) H Static Height in. (mm) A Compressed Height in. (mm) Volume in. (cm) Capacity* lb. (kg) 2 to 1 Fitting Group Suspensions Group RFQ F40-SITSilicone 1.56 (39.6) 0.31 (7.8) 0.79 (20.0) 0.63 (16.0) 0.250 (4.00) 9.50 (4.3)