MR122012/MI081212V Wheel Bearing
The DUHUI Bearing MR122012/MI081212V needle roller bearing is a radial roller bearing with a 12.70 mm bore, 31.75 mm outer diameter, and 19.30 mm width. This open-type bearing includes an inner ring and is designed for applications requiring high radial load capacity in limited radial spaces, including automotive transmissions, pumps, and compressors. The bearing meets OE specifications MR122012 and MI081212V with cross-reference to NTN MR122012+MI-081212.
Technical Specifications
| Specification | Value / Detail |
|---|---|
| DH Code | DWB2579 |
| Part Number | MR122012/MI081212V |
| Product Type | Needle Roller Bearing – Machined Ring Type with Inner Ring |
| Bore Diameter (d) | 12.70 mm (0.500 inch) |
| Outer Diameter (D) | 31.75 mm (1.250 inch) |
| Width (B) | 19.30 mm (0.760 inch) |
| Enclosure | Open |
| Configuration | with Inner Ring |
| Material | High Carbon Chrome Steel |
| Precision Class | ISO Class 0 |
| Radial Internal Clearance | CN (Normal) |
| Dynamic Load Rating (Cr) | 19.50 kN (4,400 lbf) |
| Static Load Rating (Cor) | 21.10 kN (4,750 lbf) |
| Grease Limit Speed | 14,000 rpm |
| Oil Limit Speed | 21,000 rpm |
| Operating Temperature Range | -40 to 120 °C (-40 to 250 °F) |
| Weight | 0.079 kg (0.174 lb) |
Note: Dimensional and performance data is based on published specifications. Please verify measurements against your original bearing before ordering.
Important: All information on this page is for reference only. Please verify OE numbers, dimensions, and vehicle fitment against your original part before ordering. Contact us for fitment confirmation.
DH Code & OE Numbers & Reference Numbers
DH Code: DWB2579
OE Numbers:
MR122012, MI081212V
Reference Numbers (Interchange):
NTN: MR122012+MI-081212
Vehicle Fitment
This needle roller bearing is used in automotive transmissions, pumps, compressors, and other drivetrain components requiring compact radial bearings.
Applications include:
Various automotive and industrial assemblies (verify OE number and dimensions before ordering)
Please verify OE number, dimensions and vehicle configuration before ordering.
Product Features
- Needle roller design – rollers are multiple times longer than their diameter – provides high radial load capacity in a compact cross-section.
- Includes inner ring – enables direct installation without a hardened shaft surface.
- Open-type configuration allows for application-specific lubrication – grease or oil as per operating conditions.
- Machined ring construction offers precise geometry and ISO Class 0 precision rating.
- Rated for 19.50 kN dynamic load and 21.10 kN static load – suitable for continuous rotation and oscillatory motion applications.
- Normal (CN) radial internal clearance accommodates standard mounting and operating conditions.
- Operating temperature range of -40 to 120 °C supports diverse automotive environments.
Installation Notes
- Confirm bore diameter (12.70 mm) and outer diameter (31.75 mm) match your housing and shaft before installation.
- This bearing includes an inner ring – inspect both inner and outer race surfaces for damage or wear prior to assembly.
- Apply appropriate lubricant (grease or oil) during installation – refer to your equipment manual for viscosity and volume specifications.
- Ensure proper shaft and housing tolerances – needle roller bearings require accurate fits for optimal load distribution and service life.
- When used in applications with oscillating motion, confirm the bearing supports the required angular movement without overloading the rollers.
About DUHUI Bearing
Manufactured by DUHUI Bearing – an automotive bearing supplier established in Zhejiang, China, in 2003. DUHUI produces needle roller bearings and automotive components to OE specifications. Contact us
