Are All Grease Fittings The Same?

Are All Grease Fittings The Same? Are all grease fittings the same? NPT thread Are grease fittings standard? What is the most common standard grease fitting sizes? The most common standard grease zerk size is 1/4′′‐28 SAE‐LT and is often used in automotive applications. They can also be found in agricultural environments as well as