Bearingnumberfinderbysize

This is a simplified version of our Bearing Selector that you can use to search for and find either inch or metric bearings that meet your specified dimensions in inches (in) or millimeters (mm).

The ball then returns to its closed position once the pressure drops acting as a check valve to prevent grease leakage from the grease nipple.

SKFbearing size finder

https://www.ultra-flow.com/shop/fittings-tubing/grease-nipples/grease-nipple-plastic-caps-red-for-standard-grease-nipples/

A small ball inside the grease nipple is pushed back against spring caused by the pressure of the grease gun, allowing grease to enter the bearing.

A grease nipple M6X1, also known as a grease fitting or zerk fitting, is a small tool used in mechanical systems to easily apply lubricating grease to moving parts.