RE - Radial Retaining Rings
Inch Reinforced- A reinforced version of the E ring which will accommodate higher thrust loadings and RPM. These rings function in the same size grooves as regular E/MRE rings, so that you can change from one to the other without re-engineering the application.
Size Ranges: RE--.094-.562 Inches; MRE-4mm-15mm.

E - Radial Retaining Rings
External Inch- Perhaps the most popular and widely used radial retaining ring is the "E" (so named because it is shaped like the letter "E"). Three prongs make contact with the bottom of the groove and provide a shoulder for effective retention of assemblies.
Size Ranges: E--.040-1.375 Inches; DE-1.0mm-42.0mm; ME--.1mm-25mm.

C - Radial Retaining Rings
External Crescent Inch-  Ideal for low clearance applications where radial installation is preferred.
Size Ranges: C--.125-2.0 Inches; DC-3.0mm-55.0mm; MC-.3mm-55mm.

LC - Radial Retaining Rings
External Interlocking- The LC ring is produced in two identical halves. The ends interlock into a groove on a shaft and, once assembled, are dynamically balanced. As a result, they are particularly effective at retaining assemblies with extremely high rotational speeds.
Size Range: .469-3.375 Inches.

PO/POL - Radial Retaining Rings
External Inch- The PO ring features wide "ears" (resembling those of a poodle, thus the name) which offer extra retention surface against the retained part. PO rings also come in thinner sizes as a standard series of rings known as POL. Size Ranges: PO--.156-2.0 Inches; POL--.156-1.0 Inches.

TX/TY - Radial Retaining Rings
External Toothed Inch- This ring features an outer rim with a series of prongs protruding into the center. The ends create interference with the shaft when the ring is installed and a load introduced to the other side. The difference between these two rings is that the outer rim of the TX is curved while the rim of the TY is flat.
Size Ranges: TX--.094-1.0 Inches; TY--.094-1.0 Inches; DTX-1.5mm-45.0mm.