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Date: 2016-08-22

Timken 3878 - 3820 bearing stock, Dimensions, Drawing

Series 3800
Cone Part Number 3878
Cup Part Number 3820
Design Units Imperial
Bearing Weight 1.9000 lb
0.9000 Kg
Cage Type Stamped Steel
D - Cup Outer Diameter 3.3750 in
85.725 mm
d - Cone Bore 1.4375 in
36.513 mm
B - Cone Width 1.1875 in
30.163 mm
C - Cup Width 0.9375 in
23.813 mm
T - Bearing Width 1.1875 in
30.163 mm
Z - Number of Rollers Per Row 16
R - Cone Backface "To Clear" Radius1 0.030 in
0.760 mm
r - Cup Backface "To Clear" Radius2 0.130 in
3.30 mm
da - Cone Frontface Backing Diameter 1.85 in
46.99 mm
db - Cone Backface Backing Diameter 1.89 in
48.01 mm
Da - Cup Frontface Backing Diameter 3.23 in
82.00 mm
Db - Cup Backface Backing Diameter 2.87 in
72.90 mm
Ab - Cage-Cone Frontface Clearance 0.08 in
2.03 mm
Aa - Cage-Cone Backface Clearance 0.06 in
1.52 mm
a - Effective Center Location3 -0.32 in
-8.10 mm
C90 - Dynamic Radial Rating (90 million revolutions)1 7240 lbf
32200 N
C1 - Dynamic Radial Rating (1 million revolutions)2 27900 lbf
124000 N
C0 - Static Radial Rating 33200 lbf
148000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)3 4980 lbf
22200 N
K - Factor1 1.45
e - ISO Factor2 0.4
Y - ISO Factor3 1.49
G1 - Heat Generation Factor (Roller-Raceway) 37.8
G2 - Heat Generation Factor (Rib-Roller End) 13.5
Cg - Geometry Factor 0.0873



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