China Carbon Ball Bearings suppliers Part number 608ZZ --Skate shoes bearing. 8mm x 22mm x7mm for Skateboards and Skate Scooter Roller Skates. Bearing structure photograph 1.Package & Size : 10pcs 608-2RS ball bearings each tube packing Size : 8x22x7mm, rubber sealed deep groove. 2.Material: Carbon steel, durability and resistance to deformity under heavy loads. 3.Application:Small Motor,skateboards, inline skates, scooters or other skating applications 4.Our 608-2 RS bearings Shields on double sides to keep lubricant in and contaminants out. 5.Suggestion:there is some rust protection oil coating on the bearings before outgoing , you shall do not put it on the damp place to avoid bearing get rusty .meanwhile you'd better take gloves to touch the bearings to prevent it get rusty easily since sweat finger. 6.More than 40 % of all storage damage results from insufficient lubrication, more than 35% are caused by design and installation faults as well as contamination.Our service can help you to avoid these and similar errors. Bearing installation 1.Match the dimensions of the bearings and the components (fits). 2.Ball bearings must be tightened or pressed precisely in the axial direction (do not mis align). 3.Do not pass the mounting force over the balls. 4.Heat the inner ring if using a press fit (max 100 掳C). 5.Pay attention to axial shrinkage due to cooling. The difference between bearing steel and carbon steel bearing 1. There is much difference in service life, and bearing steel has a long service life. 2. Some bearings are carbon steel bearings, mainly cross-roller bearings whose hardness and wear resistance are not as good as those of bearing steel, and their service life is much short . 3. Carbon steel bearings and crossed roller bearings made of bearing steel differ in service life. 4. Low-carbon steel is carbonized and quenched on the surface, not all of it quenched. many low-grade carbon steel bearings on the market are not hardened at all and have extremely poor wear resistance. The management of the market should be strengthened to crack down on shoddy illegal acts. 5. Carbon steel bearings are not bad, it depends on which machine is used, because some do not need high-grade ones, carbon steel bearings are suitable.The difference between the two is different in process and use effect. The standard bearing steel is Gcr15,equivalent to SEA52100. 6. The rings and rolling elements of the bearing must be repeatedly subjected to high contact pressure, and the rolling contact accompanied by sliding shall be carried out while maintaining high-precision rotation. Application of carbon steel bearings Skateboards, Roller Blade, Inline Skating, scooter and Rollerblade,fidget spinners with Chrome steel rings.China Carbon Ball Bearings suppliers website:http://www.dazbearing.com/carbon-bearings/carbon-ball-bearings/