RS PRO Red Insulated Female Spade Connector, Receptacle, 0.8 x 6.35mm Tab Size, 0.5mm² to 1.5mm²

The barrel provides a robust and secure crimp and the sleeve also protects the wire against stress and high vibration. The main feature of this female receptacle is the insulation which covers the entire length of the connector body. This insulation provides protection against electric shock and acts as a ’mini’ enclosure to protect the connection from dirt, grease, liquid and other contaminants when mated.

The wire size 'mm' (metric) or 'AWG' (American Wire Gauge) you are using

The tab size to which you will be connecting the ring terminal. The width of the receptacle has to match the width of the tab it is mating with and vice versa. The width is usually shown as a series name in inches, the most common ones being .110 (2.8mm), .187(4.8mm), .205(5.2mm), .250 (6.3mm), .375 (9.5mm). The thickness of the tabs can also vary and are usually 0.51 or 0.81mm

A ratchet crimping tool is preferable as the handles will remain locked until a full crimp cycle is completed which will prevent partial crimps. Insert the barrel of the receptacle terminal into the appropriate crimping section (indicated by sizes marked on the tool). Squeeze the tool handles together until the ratchet releases. The crimped receptacle terminal is now ready for mating with a male tab terminal to form a secure electrical connection.