T ype：MR117K SMR117K
Select Material：Bearing steel or Stainless steel
Select Bearing grades：Ordinary class ，Motor class or Specialty class
Inner Diameter：7mm
Outer Diameter：11mm
Thickness：2.5mm
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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