Idler Sprockets—Chain Tensioners
Bronze Bushed Sprocket Idlers for Use with All Steel Tighteners No.
Dimensions are in inches unless otherwise indicated.
Outside Catalog Suggested ANSI
Hub Dia.
Bushed Wt.
Teeth Diameter Number
Tightener Chain No.
LTB ¹⁵⁄₁₆ ¹⁵⁄₁₆ ¹⁵⁄₁₆ ¹⁵⁄₁₆ 1¹⁄₁₆ 1¹⁄₁₆ 1¹⁄₁₆ 1¹⁄₁₆ 1⁹⁄₁₆ 1⁹⁄₁₆
Bore Dia.
Lbs.
15 13 13 13 21 19 17 15 17 15
35B15T 41B13T 40B13T 50B13T 35B21T 40B19T 50B17T 60B15T 60B17T 80B15T
1.990 2.329 2.329 2.911 2.713 3.296 3.719 3.979 4.462 5.305
0 0 0 0 1 1 1 1 2 2
.32 .52 .52 .97 .82
35 41 40 50 35 40 50 60 60 80
1³⁄₈ 1⁹⁄₁₆ 1⁹⁄₁₆ 2 2¹⁄₈ 2⁷⁄₁₆ 2⁵⁄₈ 2¹¹⁄₁₆
¹⁄₂ ¹⁄₂ ¹⁄₂ ¹⁄₂ ⁷⁄₈ ⁷⁄₈ ⁷⁄₈ ⁷⁄₈
1.50 1.80 2.50 3.30 5.60
2⁷⁄₈ 3¹⁄₂
1¹⁄₈ 1¹⁄₈
NOTE: Idlers other than stock furnished on a made-to-order basis
Bronze Bushed Idler Sprockets with Steel Journals
Dimensions are in inches unless otherwise indicated.
No.
Outside Catalog Chain Stock
E*
Wt.
Teeth Diameter Number
Size
Bore
Dim. .59 ” .72 ” .81 ”
Lbs.
¹⁄₂ ” ¹⁄₂ ” ¹⁄₂ ”
20 15 14
31E20 51E15 61E14
35 50 60
.46 .70 .42
2.60 3.32 3.75
* Dimension E is minimum space for chain clearance
You need Adjustable Idler Sprockets to: • Obtain proper chain tension when neither driving nor driven shaft is adjustable, and to take up slack chain developed through normal chain wear • Guide chain around an obstruction • Prevent whipping action in the slack span of chain transmitting an uneven load • Bring about greater chain wrap around a small sprocket, particularly if it is the lower sprocket in a vertical drive • 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 size. They should be mounted in contact with the slack span of chain. 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 centers are short and speed is moderately high.
• Machined steel sprockets • Hardened teeth • Hardened & ground steel journals • Oil-impregnated sintered bronze bushings NOTE: Idler rpm should not
exceed 2500 and radial loading should be less than 50 pounds.
Chain Tensioners
Dimensions are in inches unless otherwise indicated.
Wt.
Suggested
Size
A B C D E F
G 2G H J
K L
M P Lbs.
Chain
#0-B #1-B #2-B #3-B
.500 .875
1.00 2.50 6.00 12.00
#35,40,41* #40,50,60*
5⁷⁄₈ 9
1¹⁄₂ 2 3 4
5¹⁄₄ 8¹⁄₈
1 1³⁄₄ 2⁷⁄₈ 3¹⁄₈
2¹⁄₂ 4¹⁄₂
⁹⁄₃₂ ¹¹⁄₃₂
³⁄₈ ¹⁄₂ ³⁄₄ ³⁄₄
2¹³⁄₁₆ 4 5¹¹⁄₁₆ 6¹⁄₄
1⁵⁄₁₆ 1⁵⁄₈ 2⁵⁄₃₂ 2³⁄₁₆
1³⁄₈ 1³⁄₄ 2⁷⁄₈ 3¹⁄₄
1¹⁄₄ 1¹⁄₂
³⁄₈ ¹⁄₂ ⁵⁄₈ ³⁄₄
³⁄₄ 1 1¹⁄₂ 2
1.125 1.750
#80,100,120* #140,160,200*
13 14
11⁷⁄₈ 12⁵⁄₈
6 6
⁹⁄₁₆ ⁹⁄₁₆
2 2
* Single-strand chain. For multiple-strand chain, use larger tensioner.
C-70
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