NAS516-1As are 1/8" flat grease fittings. Also known as flush grease zerk, these fittings are fit for aerospace applications. It's important to note that in order for aircrafts to stay in tip-top shape, it's essential to acquire the correct plating so that the grease fitting is properly installed. This is done so the fitting operates optimally.
Ever wondered what the NAS refers to in many parts numbers? SkyGeek does and because we are geeks, it's in our nature to find out. It stands for National Aerospace Standard, which means any part with such a designation has been approved by the Aerospace Industries Association (AIA) for both quality and safety. Pretty cool, huh? If the AIA approves then so do we and so will you.