Item # NNU4988K, Double Row Cylindrical Roller Bearing w/ Tapered Bore

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	Item # NNU4988K, Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NNU

The rollers in the NN type bearing are guided by the ribs of the inner ring.

Unit of Measure: Imperial Metric Both

Order Now · Technical Specifications · Dimensional Specifications

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Ordering Options		Contact NTN Customer Relations

Technical Specifications

Type		Cylindrical Roller Bearing

Bore Type		Tapered

Material		Hardened Alloy Steel

Cage Material		High Strength, 2 piece, Machined Brass

Limiting Speed - Oil		1000 RPM

Limiting Speed - Grease		850 RPM

Taper		1:12

Precision		ISO Class 0

Tolerance		ISO Class 0 (RBEC 1)

Oil Hole		w/o Oil Hole

Radial Internal Clearance		CN

Static Load Rating		1250000 lbf 5550000 N 5550.00 kN

Dynamic Load Rating		485000 lbf 2150000 N 2150.00 kN

Enclosure		Open

Operating Temperature Range		-40 to 250 ºF -40 to 120 ºC

Dimensional Specifications

		Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NNU - Dimensions larger image

d		17.3228 in 440.000 mm

D		23.6220 in 600.000 mm

B		6.2992 in 160.000 mm

C		6.2992 in 160.000 mm

Fw		19.3701 in 492.000 mm

r		0.1575 in 4.000 mm

da min		17.9528 in 456.000 mm

db min		18.4646 in 469.000 mm

Da max		22.9921 in 584.000 mm

ras max		0.1181 in 3 mm

Item # NNU4988K, Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NNU