Ball Bearing, 5x11x4mm:TMX .15, 2.5,3.3
Product Dimensions: 3.2 x 2.5 x 0.3 inches ; 0.8 ounces
Shipping Weight: 0.80 oun
Have these high quality Traxxas Ball Bearings handy and enjoy friction free performance every time you run! 5x11 Dimensions.
Ball bearings are probably the most common type of bearing. They are found in everything from inline skates to hard drives. These bearings can handle both radial and thrust loads, and are usually found in applications where the load is relatively small.
In a ball bearing, the load is transmitted from the outer race to the ball, and from the ball to the inner race. Since the ball is a sphere, it only contacts the inner and outer race at a very small point, which helps it spin very smoothly. But it also means that there is not very much contact area holding that load, so if the bearing is overloaded, the balls can deform or squish, ruining the bearing.
The concept of ball bearings can be traced all the way back to the Roman Empire, but many sources credit Leonardo Da Vinci with the first practical designs. It wasn't until 1791, however, when an English carriage maker and inventor named Philip Vaughn patented the first axle assembly to use ball bearings. Previous carriage axles would eventually wear out from the effects of friction, but Vaughn's use of ball bearings eliminated the direct contact between the drive shaft and axle.

Ball Bearing SAE52100 Chrome Steel Double Shielded R4ZZ .
250" Bore x .625" OD x .196" W (Pack of 1)
Brand Name Small Parts, Inc
Part Number BR-04-01
Item Package Quantity 1
Material Type Chromium Steel
System of Measurement English
Bearing Number R4ZZ
Bore Diameter .2500 inches
Bore Diameter Tolerance +.0000/-.0003 inches
Outside Diameter .6250 inches
Outside Diameter Tolerance +.000/-.005 inches
Thickness .196 inches
Overall Width 3/8 inches
These Ball Bearings are made from SAE 52100 Chrome Steel to sustain radial, thrust and combined loads proportionate to the capacities of the small shafts for which they are designed.
Especially suitable for use in fractional horsepower motors, small appli
Ball bearings, also known as anti-friction bearings, are small metallic or ceramic spheres used to reduce friction between shafts and axles in a number of applications. Ball bearings are often used in a series to absorb the weight placed on a moving part, or in individual cages to reduce friction in axle assemblies. Most ball bearings are manufactured to meet very exacting standards of roundness, since any deformation can cause the moving parts to fail unexpectedly.