Select Bearing grades:ordinary class,Motor class or Specialty class
Inner Diameter:4mm
Outer Diameter:8mm
Thickness:2mm
Package Includes:10pcs bearings
Feature:
Bearing grades mainly include :ordinary grade,motor grade,Specialty grade.
1. ordinary class:national standard P0 class。Dimensional accuracy less than ±0.05mm,Speed less than 1000rpm,Suitable for low speed, low requirements. Such as: low-speed transmission equipment,casters, baby carriages, toy cars, etc.
2. Motor class:national standard P0Z2 class above。Dimensional accuracy less than ±0.01mm,feels smooth , Speed less than 20000rpm, Low noise and long service life. Suitable for motors, toy models, automobiles, power tools, pneumatic tools,telecommunications equipment,fitness equipment, sports equipment, etc.
3. Specialty class: national standard P6 class above。 Dimensional accuracy less than ±0.005mm [can replace imported] ,feels smooth , Speed is greater than 20000rpm,Low noise and long service life.。Suitable for high-speed motors,high-speed models,instrumentation, precision equipment,high-end toys and other areas with high requirements.
Bearing materials mainly include : iron sheets, carbon steel, bearing steel,stainless steel, plastic, ceramics and other new materials.
1. [iron sheets] and [carbon steel] material:Low hardness, poor product accuracy and stability, and short service life。
The quality is very poor,the store will not sell.
2. [Bearing steel] material:Also known as [chrome steel],Steel grade: GCr15 is a special steel for international bearing industry standard
3. [Stainless steel] material:Default is stainless steel 440C material (with magnetic) It is an environmentally friendly standard steel for bearing industry。has the waterproof, rust-proof,anti-corrosion, acid and alkali resistance, strong stability, maintenance-free, long service life and no rust。Widely used in food machinery,Medical equipment,instrumentation,High-end crafts,high-end fishing gear,fishing reels,high-end toys, etc。
Please do not use magnetics to judge the pros and cons of stainless steel bearings.
4. [Plastic] and [ceramic] and other materials:Mainly used for insulation,Non-magnetic,etc.
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1) All items will be shipped to you Paypal address.please update your latest address when you check out,and please make sure to provide us with correct,precise,and detailed shipping Address. 2) Most of the items will be shipped via HongKong Airmail/Singapore Airmail Note:We will ship your items out via Singapore Post with a tracking number for free if your purchase exceeds $30.If not,and you still need a tracking code,please contact us when you place an order.For countries that are a little far away,especially South America,it is suggest that you add a tracking number for your order,in case of losing parcels. 3) TAX:We'll do our best to assist you to clear the goods,and the tax depends on each country's custom. 4) If you don't receive items over 30 busuness days,please feel to contact with us. 5) Below shipping time for your reference. (Since it is really busy season now,the post office gets so many packages to deal with every day,your parcel may be delayed for a few days.Hope you can understand and be patiet.)
1. No-Question-Asked Refund! If for some reason you're not satisfied with our service or product quality,please contact us within 3 days after you get the package, you can return the products to us in origunal package and we will refund your money after we get the package!(Shipping cost is NOT refundable and you should responsible for the return shipping) 2. No-Question-Asked Replacement! Although all packages are packed professionally, few item(less than 0.1%) might be damaged during the shipping, You are welcome to contact us within 3 days after you receive your package about replacement. 3.Repair Some items migth be broken caused by improper use, we are always happy to offer any helpful repair service.Of course, you can send the broken items back to us and we will help you resolve the situation and charge reasonable repair fees.
Type:SMR84K Select Material:Bearing steel or Stainless steel Select Bearing grades:ordinary class,Motor class or Specialty class Inner Diameter:4mm Outer Diameter:8mm Thickness:2mm Package Includes:10pcs bearings