KOYO MK681 needle roller bearings

Our highly-skilled and factory-trained service NTN Bearing de Mexico, S.A. experts have the resources to help you with all ZZ (Double Shield) Seals your 8 Days Days to Ship KOYO MK681 needle roller bearings needs - including routine maintenance, major repairs, warranty service, and needle roller bearings equipment inspections.

What is MK681 bearing interchange?

Brand Name: KOYO
Model Number: MK681
Series: M252300
Cone Part Number: M252330X
Cup Part Number: M252310
Design Units: Imperial
Bearing Weight: 33.70 Kg
Cage Type: Stamped Steel
d: 234.95 mm
D: 381.000 mm
PDF MK681

Product Details

Series M252300
Cone Part Number M252330X
Cup Part Number M252310
Design Units Imperial
Bearing Weight 33.70 Kg
Cage Type Stamped Steel
d 234.95 mm
D 381.000 mm
B - Cone Width 74.613 mm
C - Cup Width 57.150 mm
B 74.610 mm
R - Cone Backface To Clear Radius1 6.35 mm
r - Cup Backface To Clear Radius2 3.30 mm
da - Cone Frontface Backing Diameter 261.87 mm
db - Cone Backface Backing Diameter 272.03 mm
Da - Cup Frontface Backing Diameter 364.00 mm
Db - Cup Backface Backing Diameter 356.11 mm
Ab - Cage-Cone Frontface Clearance 4.8 mm
Aa - Cage-Cone Backface Clearance 7.6 mm
a - Effective Center Location3 -6.6 mm
C90 - Dynamic Radial Rating (90 million revolutions)4 73200 lbf
C1 - Dynamic Radial Rating (1 million revolutions)5 283000 lbf
C0 - Static Radial Rating 455000 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 41700 lbf
K - Factor7 1.76
e - ISO Factor8 0.33
Y - ISO Factor9 1.8
G1 - Heat Generation Factor (Roller-Raceway) 1839.2
G2 - Heat Generation Factor (Rib-Roller End) 226.1
Cg - Geometry Factor 0.159
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