Model: R8 ZZ
Quantity per Package: 50 Pcs
Material: 100% Chrome Steel 
Protection: Metal Shield on both sides 
Greased / Lubricated: Yes 
Bore (Inner) Diameter: 1/2" 
Outer Diameter: 1-1/8"
Width (Thickness): 5/16"
Supported Revolutions per Minute (RPM): 27,000
Dynamic Load Rating: 3911 N
Static Load Rating: 2244 N

PGN's R8z (1/2"x1-1/8"x5/16") is a single-row bearing that supports radial loads, made with Chromium Steel providing superior quality and durability. It comes pre-lubricated and shielded to keep the lubricant in and contaminants, dirt and debris out.