Needle Roller and Cage Assembly GR31(MR31+MI26) MCGILL

MCGILL GR31 (MR31+MI26) is a high-precision, separable-type cylindrical roller bearing assembly designed for heavy radial loads, high rigidity, and accurate rotational positioning. Built to ABMA/ANSI and ISO 15:2017 standards, this unit combines the MR31 outer assembly and MI26 inner ring to deliver exceptional performance in machine tool spindles, reducers, and heavy-duty transmission systems, making it a premium choice for precision industrial motion control.

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MCGILL GR31 (MR31+MI26) is a high-precision, separable-type cylindrical roller bearing assembly designed for heavy radial loads, high rigidity, and accurate rotational positioning. Built to ABMA/ANSI and ISO 15:2017 standards, this unit combines the MR31 outer assembly and MI26 inner ring to deliver exceptional performance in machine tool spindles, reducers, and heavy-duty transmission systems, making it a premium choice for precision industrial motion control.
Dimension Parameters
Bore (d): 40.64 mm (1.600 in); Outer diameter (D): 79.375 mm (3.125 in); Total width (B): 25.40 mm (1.000 in); Chamfer radius (rmin): 1.5 mm; Tolerance class: ABEC 5 / P6 precision; Dynamic radial load (Cr): 58.2 kN; Static radial load (C0r): 72.1 kN; Limiting speed (grease): 4,800 rpm; Weight: 0.48 kg.
Material Specification
Inner/outer rings and rollers: AISI 52100 (100Cr6) bearing steel, hardness 61–65 HRC, with high wear resistance, rolling fatigue strength, and dimensional stability. Cage: precision machined brass for high-speed stability, low friction, and excellent thermal resistance. Black oxide surface treatment enhances corrosion protection and lubricant retention.
Core Manufacturing Process
Key processes include hot forging for optimized grain flow, CNC turning for dimensional accuracy, vacuum hardening and tempering for uniform hardness, precision grinding, and superfinishing to achieve raceway roughness Ra ≤ 0.18 μm. Each component undergoes 100% dimensional and hardness inspection to ensure consistent performance and extended service life.
Service Life
Under ISO 281 standard operating conditions (40% rated load, 2,800 rpm, proper lubrication), rated life exceeds 8,200 hours. Service life is influenced primarily by lubrication quality, installation alignment, contamination, and operating temperature control.
Applications & Industries
Widely used in machine tool spindles, gearboxes, reducers, pumps, compressors, and industrial transmission systems. It serves machine tools, automotive manufacturing, automation equipment, metallurgical machinery, and textile industries, favored for its high radial rigidity, separable design, and precision running accuracy.
Maintenance
Lubricate with NLGI 2 EP lithium complex grease, filling 30–40% of internal space. Relubricate every 700–900 operating hours. Keep components clean and sealed against dust and moisture. Inspect vibration, temperature, and noise monthly; replace immediately in case of overheating, abnormal sound, or excessive clearance.
Installation
Clean shaft and housing before installation; verify dimensional accuracy and hardness. Assemble inner and outer rings separately using a press to avoid impact. Control alignment TIR ≤ 0.02 mm. After installation, rotate manually to confirm smooth operation and perform a 1-hour test run.MCGILL GR31 (MR31+MI26) is a high-performance precision cylindrical roller bearing ideal for heavy-load precision machinery, offering superior rigidity, accuracy, and durability for demanding industrial applications

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI/TORRNGTON
BEARINGS NO.	GR31(MR31+MI26) MCGILL
TYPE	Needle Roller and Cage Assembly
Inner(d)mm	49.2
Outer(D)mm	63.5
Width(B)mm	31.75
WEIGHT/KG	0.27
EAN CODE	0726166038205

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