IDLER SPROCKETS
U.S. TSUBAKI STOCK SPROCKETS
HOW TO ORDER
U.S. Tsubaki Stock Sprockets
IDLER SPROCKETS - BRONZE BUSHED TYPE
Adjustable Idler Sprockets are used to: • Obtain proper chain tension when either driving or driven shaft is not adjustable. • Guide chain around an obstruction. • Prevent whipping action in the slack span of chain. • Bring about greater chain wrap around a small sprocket, particularly if it is the lower sprocket in a vertical drive. • Take up slack chain caused by normal chain wear. • Provide for reversed direction of rotation of a sprocket in contact with the outside of the chain. Idler sprockets should not rotate at greater speeds than are allowable for drive sprockets of the same diameter. They should be mounted in contact with the “slack” span of chain, whenever possible. Mount them on the outside of the chain when the arc of chain wrap on the smaller sprocket would otherwise be less than 120°. It is advisable that idler sprockets have at least three teeth in mesh with the chain. Inside mounted idlers usually account for quieter operation, especially if sprocket to sprocket centers are short and speed is moderately high.
How to Order Code: Example Model # for Bronze Bushed Idler Sprockets for use with all steel chain
35
B 15T
Roller Chain Pitch Size
Hub Type
Number of Teeth
35: 3/8" Pitch (example pitch size)
B : Hub Extension One Side
15T : 15 Teeth
Bronze Bushed Idler Sprocket with Hardened Teeth Note: Bronze Idler Sprockets should not exceed 2500-rpm and have a radial loading of 50 lbs. or less.
All dimensions in inches unless noted.
ANSI Chain #
# of Teeth
Outside Diameter
HUB Type
Hub Diameter
Bushed Bore Dia.
Wt. Lbs.
Suggested Tensioner # *
W
Sprocket #
LTB
35 35 40 40 41 41 50 50 60 60 80
35B15T 35B21T 40B13T 40B19T 41B13T 41B19T 50B13T 50B17T 60B15T 60B17T 80B15T 100B13T 120B13T 140B15T 160B13T 200B13T
15 21 13 19 13 19 13 17 15 17 15 13 13 15 13 13
0 1 0 1 0 1 0 1 1 2 2 2 2 3 3 3
1.990 2.713 2.329 3.296 2.329 3.296 2.911 3.719 3.979 4.462 5.305 5.821 6.986 9.283 9.318
B B B B B B B B B B B B B B B B
1.375 2.125 1.563 2.438 1.563 2.438 2.000 2.625 2.688 2.875 3.500 4.000 4.500 5.750 5.750 5.750
0.938 1.063 0.938 1.063 0.938 1.063 0.938 1.063 1.063 1.563 1.563 1.563 1.563 2.500 2.500 2.500
0.500 0.875 0.500 0.875 0.500 0.875 0.500 0.875 0.875 1.125 1.125 1.125 1.125 1.750 1.750 1.750
0.32 0.82 0.52 1.50 0.52 1.30 0.97 1.80 2.50 3.30 5.60 5.70
100 120 140 160 200
13.00 27.30 26.40 58.00
E
11.642
* Please reference page 207 for chain tensioner information.
LTB
STYLES Bronze Bushed Idler
LTB
Ball Bearing Idler
STYLES LTB Bronze Bushed Idler
1/2"
www. ustsubaki .com
204
205
1"
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