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Idler Sprockets

Idler sprockets are specialized components in roller chain drive systems that maintain proper chain tension and alignment, ensuring smooth and efficient power transmission. Installed on the slack side of a chain drive system, they prevent chain sagging and reduce wear on the chain and sprockets, making them essential for various industrial applications, including conveyor systems, material handling equipment, and power transmission systems.
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#258795
100NB11H 1 1/2
Martin 100NB11H 1 1/2 needle bearing idler sprocket for #100 roller chain, 1-1/4" pitch, 11 teeth, 1-1/2" finished bore with keyway and setscrews. Steel construction, 5.007" outside diameter. Direct replacement for UST 40B13T and other industry idlers.
Brand Martin Sprocket
Model 100NB11H 1 1/2
$320.19 Each
Free Shipping orders over $100
#259184
120NB11H 1 1/2
Martin 120NB11H 1 1/2 needle bearing idler sprocket for #120 roller chain with 1-1/2" pitch, 11 teeth, and 1-1/2" finished bore. Steel construction with needle bearing for tensioning applications. Outside diameter: 6.009".
Brand Martin Sprocket
Model 120NB11H 1 1/2
$473.81 Each
Free Shipping orders over $100
#260524
25BB20 3/8
Martin 25BB20 3/8 ball bearing idler sprocket for #25 roller chain, 1/4" pitch, 20 teeth, 3/8" finished bore with keyway and setscrews. Steel construction with sealed ball bearing for tensioning applications. 1.728" outside diameter.
Brand Martin Sprocket
Model 25BB20 3/8
$63.06 Each
Free shipping
#260802
35BB19H 1/2
Martin 35BB19H 1/2 ball bearing idler sprocket for #35 roller chain with 3/8" pitch. 19 teeth, 1/2" finished bore with keyway and setscrews. Steel construction with sealed ball bearing for tensioner applications. Outside diameter: 2.472".
Brand Martin Sprocket
Model 35BB19H 1/2
$66.70 Each
Free shipping
#260803
35BB19H 3/8
Martin 35BB19H 3/8 ball bearing idler sprocket for #35 roller chain (3/8" pitch). 19 teeth, 3/8" bore, steel construction. Sealed bearing tensioner for chain drives. Outside diameter: 2.472".
Brand Martin Sprocket
Model 35BB19H 3/8
$66.70 Each
Free shipping
#260804
35BB20H
Martin 35BB20H ball bearing idler sprocket for #35 roller chain (3/8" pitch), 20 teeth. Sealed ball bearing construction for tensioning applications. Requires separate bushing for mounting.
Brand Martin Sprocket
Model 35BB20H
$43.52 Each
Free shipping
#260805
35BB20H 5/8
Martin 35BB20H 5/8 ball bearing idler sprocket for #35 roller chain (3/8" pitch). 20 teeth, 5/8" finished bore with keyway and setscrews. Steel construction with sealed ball bearing for tensioning applications. Outside diameter: 2.593".
Brand Martin Sprocket
Model 35BB20H 5/8
$66.94 Each
Free shipping
#261192
35NB13H 1/2
Martin 35NB13H 1/2 needle bearing idler sprocket for #35 roller chain (3/8" pitch). 13 teeth, 1/2" finished bore with keyway and setscrews. Steel construction with hardened teeth (Saber Tooth) for extended wear in abrasive or high-ratio drives.
Brand Martin Sprocket
Model 35NB13H 1/2
$97.49 Each
Free shipping
#261193
35NB19H 1
Martin 35NB19H 1 needle bearing idler sprocket for #35 roller chain (3/8" pitch), 19 teeth, 1" finished bore with keyway and setscrews. Steel construction with sealed needle bearing for tensioning applications. Outside diameter: 2.472".
Brand Martin Sprocket
Model 35NB19H 1
$97.49 Each
Free shipping
#261273
40BB17H
Martin 40BB17H ball bearing idler sprocket for #40 roller chain (1/2" pitch), 17 teeth, steel construction, 2.974" outside diameter. Sealed bearing tensioner for chain drives. Direct replacement for Dodge 40BB17H.
Brand Martin Sprocket
Model 40BB17H
$37.96 Each
Free shipping
#261274
40BB17H 5/8
Martin 40BB17H 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch), 17 teeth, 5/8" finished bore with keyway and setscrews. Steel construction with sealed ball bearing for tensioning applications. Outside diameter: 2.970".
Brand Martin Sprocket
Model 40BB17H 5/8
$67.43 Each
Free shipping
#261276
40BB18H 1/2
Martin 40BB18H 1/2 ball bearing idler sprocket for #40 roller chain with 1/2" pitch, 18 teeth, and 1/2" finished bore. Steel construction with sealed ball bearings for tensioning applications. Outside diameter: 3.140".
Brand Martin Sprocket
Model 40BB18H 1/2
$68.89 Each
Free shipping
#261277
40BB18H 5/8
Martin 40BB18H 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch). Features 18 teeth, 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with 3.140" outside diameter. Ideal for drive take-ups and chain tensioning in power transmission systems.
Brand Martin Sprocket
Model 40BB18H 5/8
$68.89 Each
Free shipping
#261278
40BB18NM 5/8
Martin 40BB18NM 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch), 18 teeth, 5/8" finished bore, plastic construction. Sealed ball bearing provides smooth chain tensioning and guidance in conveyor and power transmission systems. 3.136" outside diameter.
Brand Martin Sprocket
Model 40BB18NM 5/8
$162.97 Each
Free Shipping orders over $100
#261279
40BB25H 5/8
Martin 40BB25H 5/8 ball bearing idler sprocket for #40 roller chain with 1/2" pitch, 25 teeth, and 5/8" finished bore. Steel construction with 4.260" outside diameter. Sealed ball bearing design for tensioning and idler applications in power transmission systems.
Brand Martin Sprocket
Model 40BB25H 5/8
$78.83 Each
Free shipping
#261280
40BB35H 5/8
Martin 40BB35H 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch), 35 teeth, 5/8" finished bore with keyway and setscrews. Steel construction with sealed ball bearing for tensioning applications. 5.860" outside diameter.
Brand Martin Sprocket
Model 40BB35H 5/8
$90.96 Each
Free shipping
#261282
40BR13 1/2
Martin 40BR13 1/2 ball bearing idler sprocket for #40 chain (1/2" pitch), 13 teeth, 1/2" bore, steel construction. Sealed ball bearing for tensioning applications, 2.330" outside diameter. Direct replacement for industry-standard idler sprockets.
Brand Martin Sprocket
Model 40BR13 1/2
$63.31 Each
Free shipping
#262063
40NB19H 1
Martin 40NB19H 1 needle bearing idler sprocket for #40 roller chain with 1/2" pitch, 19 teeth, and 1" finished bore with keyway and setscrews. Steel construction with sealed needle bearing for tensioning or guiding roller chain drives. 3.300" outside diameter.
Brand Martin Sprocket
Model 40NB19H 1
$113.75 Each
Free Shipping orders over $100
#262538
50BB15H 5/8
Martin 50BB15H 5/8 ball bearing idler sprocket for #50 roller chain (5/8" pitch), 15 teeth, 5/8" finished bore, 3.320" outside diameter. Sealed ball bearing design for tensioning and idler applications. Steel construction.
Brand Martin Sprocket
Model 50BB15H 5/8
$70.57 Each
Free shipping
#262540
50BB17H 1/2
Martin 50BB17H 1/2 ball bearing idler sprocket for #50 roller chain with 5/8" pitch, 17 teeth, and 1/2" finished bore. Sealed ball bearing design for tensioning and take-up applications. Steel construction with 3.720" outside diameter.
Brand Martin Sprocket
Model 50BB17H 1/2
$72.76 Each
Free shipping
#262541
50BB17H 5/8
Martin 50BB17H 5/8 ball bearing idler sprocket for #50 roller chain (5/8" pitch), 17 teeth, 5/8" finished bore, sealed ball bearing for tensioning applications. Steel construction, 3.720" outside diameter.
Brand Martin Sprocket
Model 50BB17H 5/8
$72.76 Each
Free shipping
#262544
50BB25H 3/4
Martin 50BB25H 3/4 ball bearing idler sprocket for #50 roller chain with 5/8" pitch. Features 25 teeth, a 3/4" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 5.320".
Brand Martin Sprocket
Model 50BB25H 3/4
$82.59 Each
Free shipping
#263393
50NB17H 1
Martin 50NB17H 1 needle bearing idler sprocket for #50 roller chain (5/8" pitch). Features 17 teeth, 3.720" outside diameter, and a 1" finished bore with hardened teeth for extended service life in tensioner applications. Steel construction with sealed needle bearing.
Brand Martin Sprocket
Model 50NB17H 1
$128.16 Each
Free Shipping orders over $100
#263600
60BB12H 5/8
Martin 60BB12H 5/8 ball bearing idler sprocket for #60 roller chain with 3/4" pitch, 12 teeth, and 5/8" finished bore. Sealed ball bearing design for tensioning and idler applications. Steel construction.
Brand Martin Sprocket
Model 60BB12H 5/8
$78.59 Each
Free shipping
#263602
60BB13H 5/8
Martin 60BB13H 5/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 13 teeth, a 5/8" finished bore with keyway and setscrews, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 3.490".
Brand Martin Sprocket
Model 60BB13H 5/8
$79.30 Each
Free shipping
#263603
60BB15H 1/2
Martin 60BB15H 1/2 ball bearing idler sprocket for #60 roller chain with 3/4" pitch, 15 teeth, and 1/2" finished bore. Sealed ball bearing design for tensioning and idler applications. Steel construction.
Brand Martin Sprocket
Model 60BB15H 1/2
$84.89 Each
Free shipping
#263604
60BB15H 5/8
Martin 60BB15H 5/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 15 teeth, a 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 3.980".
Brand Martin Sprocket
Model 60BB15H 5/8
$84.89 Each
Free shipping
#263607
60BB17H 5/8
Martin 60BB17H 5/8 ball bearing idler sprocket for #60 roller chain with 3/4" pitch, 17 teeth, and 5/8" finished bore. Sealed ball bearing design for tensioning and idler applications. Steel construction with 4.460" outside diameter.
Brand Martin Sprocket
Model 60BB17H 5/8
$88.28 Each
Free shipping
#263608
60BR15 7/8
Martin 60BR15 7/8 ball bearing idler sprocket for #60 roller chain with 3/4" pitch, 15 teeth, and 7/8" finished bore. Sealed ball bearing design for tensioning and guide applications. Steel construction with 3.980" outside diameter.
Brand Martin Sprocket
Model 60BR15 7/8
$94.31 Each
Free shipping
#263609
60BR17 1 1/8
Martin 60BR17 1 1/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch), 17 teeth, 1-1/8" finished bore with keyway and setscrews. Sealed ball bearing for tensioning applications. Steel construction. Outside diameter is 4.460".
Brand Martin Sprocket
Model 60BR17 1 1/8
$126.67 Each
Free Shipping orders over $100
#264490
60NB17H 1
Martin 60NB17H 1 needle bearing idler sprocket for #60 roller chain (3/4" pitch), 17 teeth, 1" finished bore, sealed needle bearing, steel construction, 4.460" outside diameter. Designed for tensioning and idler applications in roller chain drive systems.
Brand Martin Sprocket
Model 60NB17H 1
$149.03 Each
Free Shipping orders over $100
#264841
80BB12H 3/4
Martin 80BB12H 3/4 ball bearing idler sprocket for #80 roller chain with 1" pitch, 12 teeth, and 3/4" finished bore. Sealed ball bearing design for tensioning and take-up applications. Steel construction with 4.330" outside diameter.
Brand Martin Sprocket
Model 80BB12H 3/4
$94.81 Each
Free shipping
#264843
80BR15 1 1/8
Martin 80BR15 1 1/8 ball bearing idler sprocket for #80 roller chain with 1" pitch, 15 teeth, 1-1/8" finished bore, and 5.300" outside diameter. Steel construction with sealed ball bearing for tensioning or guiding applications in conveyor and power transmission systems.
Brand Martin Sprocket
Model 80BR15 1 1/8
$155.90 Each
Free Shipping orders over $100
#265653
80NB13H 1
Martin 80NB13H 1 needle bearing idler sprocket for #80 roller chain with 1" pitch, 13 teeth, 1" finished bore, and 4.660" outside diameter. Steel construction with hardened teeth for extended wear life in tensioning and guiding applications. Needle bearing design provides smooth, low-friction rotation for idler positions in power transmission and conveyor systems.
Brand Martin Sprocket
Model 80NB13H 1
$178.72 Each
Free Shipping orders over $100
#396119
50BB17H
U.S. Tsubaki 50BB17H #50 Type B single-hub roller chain sprocket with 17 teeth and 3.720 in outside diameter. Plain bore design with hardened teeth for extended wear life in industrial power transmission and conveyor drives.
Brand U.S.Tsubaki
Model 50BB17H
$48.25 Each
Free shipping
#396121
40BB18H
U.S. Tsubaki 40BB18H #40 roller chain sprocket with 18 teeth and 3.140 in outside diameter. Type B single-hub plain bore design with hardened teeth for extended wear life in industrial power transmission and conveyor applications.
Brand U.S.Tsubaki
Model 40BB18H
$47.12 Each
Free shipping
#396122
40BB17H
U.S. Tsubaki 40BB17H #40 roller chain sprocket with 17 teeth and 2.970 in outside diameter. Type B single-hub plain bore design with hardened teeth for extended wear life in industrial power transmission and conveyor drives.
Brand U.S.Tsubaki
Model 40BB17H
$44.72 Each
Free shipping
#396132
50BB15H
U.S. Tsubaki 50BB15H #50 Type B plain bore roller chain sprocket with 15 teeth and 3.320" outside diameter. Hardened teeth for extended wear life in conveyor and power transmission drives. Single hub design for #50 ANSI roller chain systems.
Brand U.S.Tsubaki
Model 50BB15H
$48.28 Each
Free shipping
#396141
60BB15H
U.S. Tsubaki 60BB15H #60 Type B plain bore roller chain sprocket with 15 teeth and 3.980 in outside diameter. Single-hub design with hardened teeth for extended wear life in industrial power transmission and conveyor drives.
Brand U.S.Tsubaki
Model 60BB15H
$56.29 Each
Free shipping
#396142
60BB13H
U.S. Tsubaki 60BB13H #60 roller chain sprocket with 13 teeth and 3.510 in outside diameter. Type B single-hub plain bore design with hardened teeth for extended wear life in industrial power transmission and conveyor applications.
Brand U.S.Tsubaki
Model 60BB13H
$52.59 Each
Free shipping
#396666
80BB12H
U.S. Tsubaki 80BB12H #80 Type B single-hub roller chain sprocket with 12 teeth and 4.360 in outside diameter. Plain bore design with hardened teeth for extended wear life in industrial power transmission and conveyor drives.
Brand U.S.Tsubaki
Model 80BB12H
$82.08 Each
Free shipping
#566863
BB60-15
Linn Gear BB60-15 idler sprocket is a single strand steel sprocket designed for use with roller chain. This idler sprocket provides smooth chain guidance and tensioning in power transmission applications. Manufactured to ANSI standards.
Brand Linn Gear
Model BB60-15
$84.50 Each
Free shipping
#566865
BB80-15
Linn Gear BB80-15 idler sprocket for #80 roller chain. This single strand sprocket has 15 teeth with a 1" pitch. Made from steel, it is designed for use as an idler in chain drive systems. Manufactured in the USA.
Brand Linn Gear
Model BB80-15
$125.84 Each
Free Shipping orders over $100
#566867
BB100-15
Linn Gear BB100-15 idler sprocket for #100 roller chain. Single strand, 15 teeth, 1-1/4" pitch. Steel construction with plain bore. Designed for use as a tensioning or guide sprocket in chain drive systems. Made in USA.
Brand Linn Gear
Model BB100-15
$146.81 Each
Free Shipping orders over $100
#2166241
KSR16LO10101708
INA KSR16LO10101708 Chain idler sprocket
Brand INA Bearing
Model KSR16LO10101708
$55.75 Each
Free shipping
#2199810
IS-10B-1-17T
PTI IS-10B-1-17T metric idler sprocket with 5/8 in. pitch (10B), single strand, and 17 teeth. Designed for use in metric chain drive systems as a non-powered tensioning or guide sprocket.
Brand PTI
Model IS-10B-1-17T
$61.66 Each
Free shipping
#2199812
IS-16B-1-12T
PTI IS-16B-1-12T metric idler sprocket with 1 in. pitch, 16B chain size, single strand, and 12 teeth. Designed for use as a non-driven tensioning sprocket in metric conveyor and power transmission systems.
Brand PTI
Model IS-16B-1-12T
$83.58 Each
Free shipping
#2283450
1297373
Browning HND40B19 IDLER 1297373 double-strand idler sprocket for #40-2 ANSI roller chain with 1/2" pitch. It features 19 teeth, a 3.28" outside diameter, and a needle bearing for smooth idler operation. The sprocket has a 2.125" shaft length and is designed for conveyor and tensioning applications. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297373
$303.91 Each
Free Shipping orders over $100
#2283451
1297381
Browning HND50B17 IDLER 1297381 steel idler sprocket for ANSI #50-2 double-strand roller chain with 17 teeth and a 5/8-inch pitch. Features a needle bearing for smooth idler rotation and a 2.125-inch shaft length. Used for chain tensioning and guiding in conveyor and material-handling drives. Genuine Browning from Regal Rexnord.
Brand Browning
Model 1297381
$338.92 Each
Free Shipping orders over $100
#2283452
1297399
Browning HND60B17 IDLER 1297399 steel idler sprocket for ANSI #60-2 double-strand roller chain with 17 teeth and a 3/4-inch pitch. It features a needle bearing for smooth idler rotation and a 3.125-inch shaft length. This sprocket is used for chain tensioning and guiding in conveyor and material-handling drives. Genuine Browning from Regal Rexnord.
Brand Browning
Model 1297399
$393.00 Each
Free Shipping orders over $100
#2283453
1297407
Browning HND80B13 IDLER 1297407 steel idler sprocket for ANSI #80-2 double-strand roller chain with 13 teeth and a 1-inch pitch. Features a needle bearing for smooth idler rotation and a 3.125-inch shaft length. Used for chain tensioning and guiding in conveyor and material-handling drives. Genuine Browning from Regal Rexnord.
Brand Browning
Model 1297407
$387.22 Each
Free Shipping orders over $100
#2283454
1297308
Browning HN100B11 IDLER 1297308 steel idler sprocket for #100 ANSI roller chain with 11 teeth and a 1-1/4-inch pitch. Features a needle bearing for smooth idler rotation and a 4-inch shaft length. Used to guide or tension chain in conveyor and material-handling drives. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297308
$338.18 Each
Free Shipping orders over $100
#2283455
1297316
Browning HN120B11 IDLER steel idler sprocket for #120 ANSI roller chain with 11 teeth, 1-1/2" pitch, and a 6.01" outside diameter. Features a needle bearing for smooth idler operation and a 4" shaft length. This single-strand idler sprocket is used for chain tensioning in conveyor and material-handling drives.
Brand Browning
Model 1297316
$506.69 Each
Free Shipping orders over $100
#2283460
1297266
Browning HN40B19 IDLER steel idler sprocket for #41 ANSI roller chain with 1/2" pitch and 19 teeth. Features a needle bearing for smooth idler operation and a 2.125" shaft length. This single-strand idler sprocket guides or tensions chain in conveyor and power transmission drives.
Brand Browning
Model 1297266
$138.67 Each
Free Shipping orders over $100
#2283462
1297274
Browning HN50B17 IDLER (1297274) steel idler sprocket for #50 ANSI roller chain with 5/8" pitch, 17 teeth, and a needle bearing for smooth rotation. Outside diameter 3.72", shaft length 2.125". Single-strand design for tensioning or guiding chain in conveyor and power transmission systems. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297274
$149.99 Each
Free Shipping orders over $100
#2283463
1297282
Browning HN60B17 IDLER 1297282 #60 roller chain idler sprocket with 17 teeth and 3/4" pitch. Steel construction with a needle bearing for smooth idler rotation and a 2.125" shaft length. Used for chain tensioning and guiding in conveyor and material-handling drives. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297282
$174.24 Each
Free Shipping orders over $100
#2283464
1297290
Browning HN80B13 IDLER 1297290 steel idler sprocket for #80 ANSI roller chain with 13 teeth, 1-inch pitch, and 4.66-inch outside diameter. Features a needle bearing for smooth idler operation and a 2.125-inch shaft length. This single-strand idler sprocket is used to tension or guide chain in conveyor and power transmission systems.
Brand Browning
Model 1297290
$203.90 Each
Free Shipping orders over $100
#2286260
1297449
Browning HB40A17X5/8 IDLER steel ANSI #40 roller chain idler sprocket with 17 teeth, a 5/8-inch finished bore, and an integral ball bearing. It has a 2.721-inch pitch diameter and a 2.96-inch outside diameter. This single-strand idler sprocket guides and tensions chain in conveyor and power transmission drives.
Brand Browning
Model 1297449
$82.49 Each
Free shipping
#2286262
1297464
Browning HB60A13X5/8 IDLER 1297464 steel ANSI #60 roller chain idler sprocket with 13 teeth, 3/4" pitch, and 5/8" finished bore. Features an integral ball bearing for smooth rotation and tensioning in conveyor and drive systems. Compatible with standard ANSI #60 roller chain for industrial material handling and power transmission applications.
Brand Browning
Model 1297464
$98.23 Each
Free shipping
#2286263
1297472
Browning HB80A12X3/4 IDLER 1297472 steel #80 roller chain idler sprocket with 12 teeth, 3/4-inch finished bore, and integral ball bearing. 3.864-inch pitch diameter, 4.33-inch outside diameter. Designed for single-strand use with ANSI #80 chain in conveyor and material-handling applications. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297472
$124.27 Each
Free Shipping orders over $100