Sealing Types:

	RS rubber seal is vulcanized and formed with NBR, which is fixed in the outer ring sealing groove by elasticity of rubber and can be disassembled. Rubber inner lip is in contact with outer surface of inner ring. It has wear-resistance, oil resistancefeature and good mechanical stability.
	Stamped and formed with high-quality steel framework, fixed in the outer ring sealing groove, steel contact, solid andreliable; the inner of framework is attached by NBR, which the lip is contact with outer surface of inner ring to prevent dust, sand and other impurities from entering into bearings.
	There is an RS seal inside, which is fixed in the outer ring sealing groove, and a dusting retaining ring outside which is rigidly fixed in the outer diameter of the inner ring. This labyrinth sealing structure effectively prevents the invasion of dust and the  leakage of grease.
	High-quality steel framework is firmly riveted with the outer ring. The sealed three NBR lips have great contact force with the outer diameter of the inner ring. It can effectively prevent the invasion of water, dust, graveland other impurities. It issuitable for harsh environment.

As to locking methods and the bore shape, it can be classified:

-UC series: suitable for both constant and alternating directions of rotation, have a cylinderical bore, locked on to the shaft by tightening two grub (set) screws positioned 120° apart in the inner ring.

-UB serises, cylinderical bore, flat head at one end, locking with set screws

-UEL series: suitable for constant directions of rotation, have a  cylinderical bore, have an eccentric step on one side of the extended inner ring,  locked onto the shaft by an eccentric locking collar and a single grub screw. 

-UE serises, like UEL series locking with eccentric locking collar, but only can take lighter loads

- UK series: suitable for both constant and alternating directions of rotation, have a tapered bore, locked onto the shaft by an adapter sleeve and locking washer

Bearing can be supplied with materials of bearing steel and stainless steel.

The bearing housing are available as grey cast iron, pressed steel sheet, stainless steel and  thermoplastic.

Basic bearing unit types
Bearings         Housing		UC	UEL	UK	UB	UE
P Pillow block type  Cast iron		UCP	UELP	UKP
PA Tapered-base pillow block type  Cast iron		UCPA		ULPA
PP Pillow block type  Pressed steel plate					UBPP	UEPP
F Square-flanged type  Cast iron		UCF	UEF	UKF
FC Round-flanged type with spigot joint  Cast iron		UCFC		UKFC
FL Rhombic-flanged type  Cast iron		UCFL	UEFL	UKFL
FB Three-bolt flange type  Cast iron		UCFB
PF Square-flanged type  Pressed steel plate					UBPF	UEPF
PFL Rhombic-flanged type  Pressed steel plate					UBPFL	UEPFL
T Take-up type  Cast iron		UCT		UKT