Hub City offers a wide range of products in the IndustriaLine™ mounted ball bearing product line. These include pillow blocks, 2, 3 and 4 hole flange blocks, 4 hole piloted flange cartridges, and wide slot and narrow slot take-up units. Ball bearing units are available with setscrew locking or eccentric locking collar, with narrow inner race or wide inner race, with normal duty or medium duty bearings. Housings are available in gray cast iron or Hub-Alloy®. Refer to Features Index for description of specific units.
Bearings Bearings have spherical outer races to accommodate up to 1.5° misalignment. Races and balls are made of SAE 52100 vacuum degassed bearing quality steel. Ball retainers are made of molded, glass fiber reinforced polyamide. Races are hardened, ground and honed for quiet operation, and Grade 10 balls are used. Inner races are zone hardened in the ball raceway and seal contact areas. The setscrew end is unhardened to prevent cracking at the setscrew threads. Setscrews are located at 120° to minimize inner ring distortion, and have knurled cup point to resist loosening under vibration. Seals have a nitrile rubber lip bonded to a steel trash guard.. The positive contact, low friction seal rides on the precision ground surface of the inner race. Wide inner race bearings also have steel flingers that rotate with the inner race to provide extra protection. All ball bearings are prelubricated with high quality lithium grease. Hub City bearings have an operating temperature range of -25° F to 225° F.
Housing Housings for Hub City bearing units are precision machined from rugged cast iron or high strength Hub-Alloy® castings. Hub-Alloy® is a cast ferrous material this is manufactured in a carefully controlled process to produce properties exceeding the specifications listed below. Hub-Alloy® can be used to replace malleable iron or ductile iron. It is recommended for severe applications where the stronger material is required to withstand heavy loads imposed on the housing. Hub-Alloy® has tensile strength properties in the range 50-65,000 psi, yield strength in the range 32-45,000 psi, and elongation in the range 10-12%. Specific properties of particular housings vary according to the configuration of the housing. Cast iron housings meet or exceed the requirements of SAE G3000 gray iron. Typical tensile strength is 30,000 psi.
Special Modications Hub City can furnish modified or special units to suit customer requirements. Typical modifications include: • Housing modifications • Special grease types • Dust caps • Auxiliary anti-rotation devices • Custom bearing units with special housings and/or bearings Modified or special units may be subject to increased lead time and minimum production order quantities
