Pre-Lubricated: No
the SNATFB has an eccentric locking bearing insert
web with lightening holes
and most come with a selection of bore diameters
the CUCSHA has a Hard Chrome bearing insert and a Stainless Steel housing
NJ48 Cast Iron Spur Gear 3-15/16" Diameter Pre-Lubricated: NoBoston Gear spur gears are designed to transmit motion and power between parallel shafts. The different styles offered include spur, gear rack, pinion wire, stem pinions, and internal gears, and most come with a selection of bore diameters, keyways, and setscrews to accommodate a wide variety of application requirements. They are available in plastic, non metallic, brass, steel, and cast iron and are manufactured in a variety of styles, including