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Date: 2016-08-22

Timken 387A - 383A bearing stock, Dimensions, Drawing

Series 385
Cone Part Number 387A
Cup Part Number 383A
Design Units Imperial
Bearing Weight 1.5000 lb
0.7000 Kg
Cage Type Stamped Steel
D - Cup Outer Diameter 3.9370 in
100.000 mm
d - Cone Bore 2.2500 in
57.150 mm
B - Cone Width 0.8640 in
21.946 mm
C - Cup Width 0.7018 in
17.826 mm
T - Bearing Width 0.8268 in
21.001 mm
Z - Number of Rollers Per Row 19
R - Cone Backface "To Clear" Radius1 0.140 in
3.560 mm
r - Cup Backface "To Clear" Radius2 0.080 in
2.03 mm
da - Cone Frontface Backing Diameter 2.48 in
62.99 mm
db - Cone Backface Backing Diameter 2.76 in
70.10 mm
Da - Cup Frontface Backing Diameter 3.68 in
93.00 mm
Db - Cup Backface Backing Diameter 3.50 in
88.90 mm
Ab - Cage-Cone Frontface Clearance 0.08 in
2.03 mm
Aa - Cage-Cone Backface Clearance 0.04 in
1.02 mm
a - Effective Center Location3 -0.12 in
-3.00 mm
C90 - Dynamic Radial Rating (90 million revolutions)1 6280 lbf
28000 N
C1 - Dynamic Radial Rating (1 million revolutions)2 24200 lbf
108000 N
C0 - Static Radial Rating 24100 lbf
107000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)3 3810 lbf
16900 N
K - Factor1 1.65
e - ISO Factor2 0.35
Y - ISO Factor3 1.69
G1 - Heat Generation Factor (Roller-Raceway) 42
G2 - Heat Generation Factor (Rib-Roller End) 15.7
Cg - Geometry Factor 0.0859



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