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There are many varieties of U-Joints, a few of which are incredibly complex. The simplest category U Joint china called Cardan U-Joints, are either block-and-pin or bearing-and-cross types.

U-joints are available with two hub styles solid and bored. Stable hubs don’t have a machined hole. Bored hubs have got a hole and so are known as for the hole form; round, hex, or sq . style. Two bored designs that deviate from these prevalent shapes are splined, which have longitudinal grooves within the bore; and keyed, which have keyways to prevent rotation of the U-joint on the matching shaft.

Using the incorrect lube can lead to burned trunnions.
Unless otherwise recommended, use a superior quality E.P. (severe pressure) grease to program most vehicular, professional and auxiliary travel shaft applications.
Mechanically flexible U-Joints accommodate end movement by simply utilizing a telescoping shaft (square shafting or splines). U-Joints function by a sliding movement between two flanges that are fork-formed (a yoke) and having a hole (vision) radially through the attention that is linked by a cross. They let larger angles than versatile couplings and are used in applications where substantial misalignment needs to be accommodated (1 to 30 degrees).

Always make sure fresh, fresh grease is evident by all four U-joint seals.

Can be caused by operating angles which are too big.
Can be caused by a bent or sprung yoke.
Overloading a drive shaft can cause yoke ears to bend. Bearings will not roll in the bearing cap if the yoke ears are not aligned. If the bearings end rolling, they remain stationary and can “beat themselves” in to the surface area of the cross.
A “frozen” slip assembly will not allow the travel shaft to lengthen or shorten. Each and every time the drive shaft attempts to shorten, the strain will be transmitted into the bearings and they will mark the cross trunnion. Unlike brinnell marks due to torque, brinnell marks that will be the effect of a frozen slip are constantly evident on the front and back areas of the cross trunnion.
Improper torque on U-bolt nuts can cause brinelling.
Most suppliers publish the recommended torque for a U-bolt nut.
Improper lube procedures, where recommended purging is not accomplished, can cause one or more bearings to be starved for grease.