Lubricity is more than a just a cool word. It is the slipperiness needed on a fastener to achieve controlled torque during assembly. A wide variety of lubricants are specifically designed for this purpose, ranging from beeswax polish and anti-seize grease, to silicone spray.
Often overlooked is the lubricity offered by threadlockers, which are well-known for keeping fasteners tight and immune to vibration. These anaerobic adhesives fill the grooves of threaded fasteners, then harden to a tough solid when exposed to metal ions in the absence of air.