MR88N+MI72N Heavy Duty Needle Roller Bearing 114.3×177.8×63.5mm MR88N Assembly With MI72N Inner Race
- MR88N+MI72N is a heavy-duty separable inch-size needle roller bearing assembly from MR series. MR88N refers to the outer ring & needle roller-cage unit without inner race; MI72N is the matched separate inner ring. Only assembled together can they form a complete working bearing unit. The outer ring features built-in lubriion groove and oil hole for convenient re-lubriion. Made of high-quality bearing steel, this unit delivers outstanding radial load capacity, widely adopted for heavy-load low-to-medium speed industrial equipment as replacement for McGill Cagerol bearings.
*Send inquiry to get latest factory price and technical datasheet for MR88N+MI72N needle roller bearing.
| Item | Spec |
|---|---|
| Complete Model | MR88N + MI72N |
| Bore d | 114.3 mm (4.5") |
| Outer Diameter D | 177.8 mm (7") |
| Width | 63.5 mm |
| Type | Heavy Duty Caged Needle Roller Bearing |
| Structure | Separable (Outer roller unit + separate inner ring) |
| Material | GCr15 Chrome Bearing Steel |
| Dynamic load Cr | 70200 lb ≈ 312 kN |
| Static load C0r | 169800 lb ≈ 755 kN |
| Feature | Outer ring with centralized lubriion groove & oil hole |
- Separable structure: MR88N roller assembly and MI72N inner ring can be mounted separately for easy installation.
- Ultra-high radial load capacity, ideal for heavy-duty working conditions.
- Outer ring equipped with annular lubriion groove and oil hole to maintain stable lubriion.
- Precision machined raceways and needle rollers for low friction and long service life.
- Standard inch dimension, perfect interchange for original MR series bearing.
- Open-type design, suitable for centralized lubriion systems.
- Construction machinery & off-highway equipment
- Mining machinery and heavy gearboxes
- Agricultural heavy-duty machinery
- Hydraulic equipment and industrial transmission devices
- Steel processing machinery
- General heavy engineering machinery
*Contact our technical team to confirm compatibility and bearing assembly suggestions.
- Strict raw material inspection, adopt high grade chrome bearing steel to guarantee hardness and wear resistance.
- Precision grinding process ensures accurate dimension and interchangeability with original equipment.
- Complete stock for MR series inch needle bearings, support sample testing and bulk wholesale.
- Professional technical support for bearing selection and assembly guidance.
- Accept OEM service, laser marking and customized packaging according to customer requirements.
Q1: Are MR88N and MI72N two independent usable bearings?
A1: No. MR88N is only the outer ring & needle roller assembly without inner race; MI72N is the matched inner ring. They must be used together as one complete bearing unit. Separate parts cannot operate normally.
Q2: What are the dimensions of MR88N+MI72N?
A2: Bore 114.3 mm (4.5"), Outer Diameter 177.8 mm (7"), Width 63.5 mm (2.5").
Q3: Can this bearing work at high speed?
A3: It is designed for heavy radial load, recommended for low and medium speed operation.
Q4: Does this bearing support re-lubriion?
A4: Yes. The outer ring has built-in lubriion groove and oil hole for periodic grease replenishment.
Q5: Is interchangeability available with McGill original MR88N/MI72N?
A5: Yes, our GQZ bearing maintains standard inch dimensions for direct replacement.
*Place bulk orders for MR series inch needle bearings, enjoy sufficient stock and fast delivery.
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