U.S. TSUBAKI STOCK SPROCKETS
Idler Sprockets—Ball Bearing
Ball Bearing Idler Sprocket Hardened Teeth
Dimensions are in inches unless otherwise indicated.
No.
Catalog Number 35BB20 40BB17 40BB18 50BB15 50BB17 60BB13 60BB15 80BB12
Chain
Wt.
Teeth
Size
O.D. 2.60 2.97 3.14 3.32 3.72 3.51 3.98 4.36
B
L
W
Lbs.
20 17 18 15 17 13 15 12
35 40 40 50 50 60 60 80
.638 .638 .638 .638 .638 .638 .638 .750
.72 .72 .72 .72 .72 .72 .72 .61
.168 .284 .284 .343 .343 .459 .459 .575
.38 .52 .53 .75 .78 .76
1.06 1.50
NOTE: 638 Dim. is + .005; 750 Dim. is + .005-.000.
Radial Load Capacity in Lbs. at Various Speeds (Outer Race Rotating)
Sprocket No.
RPM
50
100 515
300 357 895
500 300 755
750 265 665
1000 240 600
1200 225 565
LOAD LOAD
650
35BB20—60BB13 80BB12
1630
1290
Sprocket No.
RPM
1500 208 523
1800 195 493
2400 179 447
2600 173 434
3000 155 415
3600 156
4000 151
LOAD LOAD
35BB20—60BB13 80BB12
—
—
RPM
4500 143
5000 140
Sprocket No.
LOAD
35BB20—60BB13
Ratings shown above are based on an average bearing life of 2,500 hours.
C-71
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