NNU4976-S-K-M-SP

Specifications

Availability: 100 PCS

Brand: HSN/ FAG/ OEM

Bearing Number: NNU4976-S-K-M-SP

Category: Super-Precision Bearings

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Weight and Dimensions

Bore (d): 380 mm

Outer (D): 520 mm

Width (B): 140 mm

Weight: 86.9 kg

Data from Schaeffler (medias)

Basic Dynamic Load Rating, Radial C_r: 1440000 N

Basic Static Load Rating, Radial (C_0r): 3600000 N

Fatigue Load Limit, Radial (C_ur): 370000 N

Limiting Speed for Grease Lubrication (n_{G Grease}): 1380 r/min

Limiting Speed for Oil Lubrication (n_{G Oil}): 1620 r/min

Product Properties

Precision: P0, P6, P5

Hardness: HRC58-62

Ring Material: GCr15, GCr15SiMn, 100CrMnSi6-4, etc.

Cage Material: Brass, Steel

Certificate: ISO9001:2015

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Downloads & Links

FAG Super-Precision Bearings Guide

Product Description

The NNU4976-S-K-M-SP double-row super precision cylindrical roller bearing consists of an inner ring, outer ring, two rows of cylindrical rollers, and a solid brass cage. Its double-row design provides high radial load capacity and excellent radial rigidity, while the tapered bore allows precise adjustment of radial internal clearance during mounting. The outer ring features a lubrication groove and lubrication holes for efficient lubricant distribution, while the SP precision class ensures high running accuracy and stable performance.

The NNU4976-S-K-M-SP bearing is suitable for large machine tool main spindles, heavy-duty machining spindles, roll grinding equipment in steel processing, and other high-precision rotating systems. Its high radial rigidity, robust brass cage, adjustable radial clearance, and efficient lubrication provide reliable radial support for heavily loaded precision applications.