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Quick Details

  • Structure: Deep Groove
  • Type: Ball
  • Brand Name: FreeRun
  • Bore Size: 4 mm
  • Outside Diameter: 8 mm
  • Model Number: MR84-2RS
  • Precision Rating: ABEC-1,ABEC-3,ABEC-5,ABEC-7
  • Seals Type: 2RS (rubber seals on both sides)
  • Number of Row: Single Row
  • Place of Origin: Fujian, China (Mainland)
  • Bearing: 4x8x3mm Mini deep groove ball bearing
  • Cage/Retainer type: Crown retainer,Ribbon Retainer or without retainers
  • Retainer material: Stainless Steel,PTFE, Nylon, PEEK,PA6,6GF
  • Quality-standard of balls: G10 as DIN 5401, ISO 3 290
  • Hardness of balls and rings: 59-65 HRC
  • Lubrication: Oil,Grease,dry
  • Vibration Level Codes: V4,V3,V2,V1
  • Internation Clearance Codes: C0,C2,C3,C4,C5
  • Other Calling Of Bearing: Kugellager,rodamientos,lager,lozysko,forsynet,rolamento
  • Other Calling Of Miniature Bearing: Miniaturkugellager,micro-cuscinetto,miniaturni loziska

Packaging & Delivery

Packaging Details 10 pcs in plastic tube,10 tubes in one paper box.
Delivery Time it depends on the order quantity

Different color seals ball bearing MR84-2RS 4x8x3mm Mini deep groove ball bearing

FreeRun bearing is a specialized manufacturer of Miniature ball bearings.


Single-row, deep groove radial ball bearings are the most common bearing type, having a wide range of applications. Radial bearings are made with very high levels of precision and used in applications where rotational performance and low torque is necessary, but load is a secondary issue. Deep-groove bearings however do have higher load ratings for their size than shallow-groove ball bearings, but are also less tolerant of misalignment.


1) Structure: Without Flanged
1),Shield / closure: Open,Metal Shield,Rubber Seals,Teflon Sealed,
   Colors of rubber seal shields: Black,Blue,Red,Tellow,Orange....
2),Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7
3),Vibration level codes: V4, V3, V2, V1
4),Internal clearance codes: C0,C2, C3, C4, C5
5),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic
6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel
7),Bore Size:from 1mm to 15mm
8),Outside Diameter:from 3mm to 30mm


Delivery&Package&Payment terms:

Large Inventory, Ship Quickly!

Ship way:

1. Express (TNT, EMS, DHL, UPS, FedEx, SF Express etc)

2. Chinese Regular Mail/ Post Mail

3. By Sea.

Package: 10 pcs in plastic tube, 10 tubes in one paper box.

Industrial-packing: 10 pcs in soft shrink-wrap weld with printing stick-label as Brand.

Payment terms: L/C, T/T, PayPal, Western Union


Markets: USA, Italy, Hong Kong, UK, Germany, Australia, New Zealand, Japan, Spain, Czech, Vietnam, South Africa etc.




Inside Diameter: 4mm
Outside Diameter: 8mm
Width: 3mm
Seals / Shields: 2RS (rubber seals on both sides)
Metric Diameter:4 X 8 X 3 mm
Inch  Diameter:0.1575 X 0.315 X 0.1181
Max Load:Dyn <Cr(N)>: 395
 Stat<Cor(N)>: 141
RPM of grease Bearings (x1000): 
RPM of oil Bearings (x1000) : 67
Quantity of balls:7PCS
Diameter of balls:1.2
Min.Raius(rs) 0.10mm,0.15mm

Freerun Bearing is a specialized manufacturer of rc bearing,rc car bearing,rc bearings,bearing for rc,rc one way bearing,bearings for rc,rc ball bearings,rc car bearings,rc ball bearing,rc ceramic bearings,rc wheel bearings.

Freerun's RC Bearing Pack for all popular Rc model productions.

We can make the bearing with all colour, such as : yellow,red,black,blue etc.

The same size can be made of different materials, including,
Stainless Steel Bearings,Chrome Steel Bearings,Carbon Steel Bearings,Ceramic Bearings


We also can offer the bearings as following:

Transaction History of the Supplier

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Transaction Details

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China (Mainland) | Manufacturer, Trading Company
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1 Transactions 4,000+
The supplier’s transactions conducted via Alibaba.com in the past 6 months.
The supplier supports Trade Assurance – A free service that protects your orders from payment to delivery.
Supplier's Trade Assurance Limit: US $106,000
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