N 318 ECM/C3 SKF
SKF Cylindrical Roller Bearings
Metric single row cylindrical roller bearing with brass cage & C3 clearance 

In bearing of this type, the cylindrical rollers Bearing are in linear contact with the raceways. They have a high radial load capacity and are suitable for high speeds.
There are different types designated NU, NJ, NUP, N, NF for single-row bearings, and NNU, NN for double-row bearings depending on the design or absence of side ribs.
The outer and inner rings of all types are separable.
Pressed steel or machined brass cages are generally used, but sometimes molded polyamide cages are also used.