Trolley casters bearing 608rs rolamento 608

Trolley casters bearing 608rs rolamento 608

1.Skateboard bearings
Skateboard bearings are the round metal pieces that fit inside the wheels to mount the wheels to the axle. Regardless of wheel size, all skateboard bearings are the same size and will fit any skateboard wheel that Warehouse Skateboards sells. The universal measurements for bearings are 8mm (core), 22mm (outer diameter), and 7mm (width).

Skateboard bearings are sold in sets of eight, as each wheel requires two bearings.

2.Specifications of skate bearings 608
Model:skateboard bearings 608
Cage:nylon
Closure:rubber seals
Material:chrome steel
Precision:ABEC11
Clearance:C0 
Vibration:V1 V2 V3 V4
Packing:1 set of 8 bearings
Sample:Offered
3.What are ABEC Rating
Skateboard bearings are measured by an ABEC rating, which rates the quality of materials and precision used in manufacturing the skateboard bearing. The higher the ABEC rating, the more precise the bearing will be. This rating system includes grades 1, 3, 5, 7, and 9. The closer you get to an ABEC 9 rating, the more speed and less friction your skateboard will have. Here are some general guidelines for ABEC ratings.

ABEC 1 skateboard bearings tend to be the least expensive, the most crude, and the least accurate. The quality of the steel is not very high.
ABEC 3 skateboard bearings are generally inexpensive and do not roll smoothly or quickly.
ABEC 5 skateboard bearings are standard for most types of skateboarding. This rating gets you a fast speed at an affordable cost.
ABEC 7 skateboard bearings are very fast, smooth, and cost slightly more.
ABEC 9+ skateboard bearings are extremely fast! They are great for downhill skating and skaters that want to move insanely fast.

4.What makes up a skateboard bearing?

Skateboard bearings may be small, but they are incredibly complex. When you first order skateboard bearings, you will probably think of them as one part of your skateboard. It isn't until you need to do maintenance on your bearings that you will have to split them open and learn about what's inside. Skateboard bearings are comprised of seven smaller parts:

C-ring: a thin ring that fits into a groove on the outside of the bearing to lock the shields in place.
Bearing Shield: a medium-sized ring on the side of the bearing that prevents dirt from getting into the ball bearings.
Outer ring: the round metal exterior that all of the other parts fit into.
Inner Ring: the smaller metal ring that fits within the outer ring. When you slide your bearing/wheel setup onto the axles, the inner ring is what the axles fit through.
Steel balls: set of 6 or 7 steel or ceramic balls that rest in the ball retainer. These are arguably the most important part of the bearing, as they allow the bearing casing to spin around them.
Ball Retainer: also called a Delrin crown, the ball retainer holds the individual ball bearings in place, while still allowing the casing to spin around them.
Rubber seal: The soft rubber ring on the outside of the bearing that assists in shielding the bearing interior against dirt and debris.
5.Skateboard bearing material quality
Steel bearings
Most skateboard bearings are made of steel. With steel bearings, the overall quality of the steel, the sealing, and the interior ball bearings varies from brand to brand. The rule of thumb tends to be that the more expensive the skateboard bearings, the higher the quality. Inexpensive bearings tend to be made of cheaper materials; more expensive skateboard bearings contain better sealing, more inner ball bearings, and higher-quality metals.
Ceramic bearings
ceramic skateboard bearings, which are extremely smooth, produce very little friction, and won't expand in the heat. They are slightly more costly than standard metal bearings, but are considered very high quality and don't require as much maintenance.
6.Bearing Options
Bearing Spacers
Bearing spacers are small metal cylinders that fit into a skateboard wheel between the bearings. Their purpose is to reduce the weight distributed to each bearing, which can make your turns smoother and more stable and also extend the life of your bearings. Skateboard bearings are totally optional; longboarders and casual skaters likely won't put enough pressure on their boards to ever need them, though they are definitely a good investment if you want to slide, do a lot of tricks, and generally skate hard. Bearing spacers are typically inexpensive, and can be made from steel, aluminum, or other types of metal.
Speed Washers
Speed washers are thin, metal washers that are slipped over the axle between the nut and the bearing, and the hanger and the bearing. Though they go by many different names (speed washers, speed rings, bearing washers), all speed washers have the same purpose: to reduce friction in order to help the wheel turn faster. They serve as a buffer between the nut and the bearing, which allows your wheels to rotate quickly while also protecting the bearing face from damage.