When choosing the right fully insulated female spade connector, you should take into account the wire size (mm or AWG) as well as the tab size to which it will likely be connected. The width of the receptacle should match the width from the tab, as well as the thickness from the tabs can vary greatly. Common tab sizes include .110 (2.8mm), .187 (4.8mm), .205 (5.2mm), .250 (6.3mm), and .375 (9.5mm). Proper selection ensures a safe and secure and reliable electrical connection.