NNU4988 KOYO Double-row cylindrical roller bearings

Brand Name:KOYO
Model Number:NNU4988
Series:18000
Cone Part Number:18200
Cup Part Number:18337
Design Units:Imperial
Bearing Weight:0.4 Kg
Cage Type:Stamped Steel
d:50.8 mm
D:85.725 mm
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Product Details

Series18000
Cone Part Number18200
Cup Part Number18337
Design UnitsImperial
Bearing Weight0.4 Kg
Cage TypeStamped Steel
d50.8 mm
D85.725 mm
B - Cone Width18.263 mm
C - Cup Width12.700 mm
B19.050 mm
R - Cone Backface To Clear Radius11.520 mm
r - Cup Backface To Clear Radius21.52 mm
da - Cone Frontface Backing Diameter55.88 mm
db - Cone Backface Backing Diameter58.93 mm
Da - Cup Frontface Backing Diameter82.00 mm
Db - Cup Backface Backing Diameter75.95 mm
Ab - Cage-Cone Frontface Clearance2.3 mm
Aa - Cage-Cone Backface Clearance1.8 mm
a - Effective Center Location32 mm
C90 - Dynamic Radial Rating (90 million revolutions)43560 lbf
C1 - Dynamic Radial Rating (1 million revolutions)513700 lbf
C0 - Static Radial Rating14400 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)63470 lbf
K - Factor71.03
e - ISO Factor80.57
Y - ISO Factor91.06
G1 - Heat Generation Factor (Roller-Raceway)26.1
G2 - Heat Generation Factor (Rib-Roller End)20.3
Cg - Geometry Factor0.0852
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Company Profile

Phone 409-782-6227
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