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Type A Idler Sprockets

Type A idler sprockets are specialized roller chain sprockets designed to maintain proper chain tension and alignment in power transmission systems. Featuring a simple, flat profile without a hub or teeth, these sprockets are used in various industrial applications to reduce chain wear, minimize noise, and improve overall system efficiency. Selection of a Type A idler sprocket should consider factors such as chain size, pitch, and required load capacity.
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#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.
Brand Martin Sprocket
Model 25BB20 3/8
$59.65 Each
Free shipping
#260802
35BB19H 1/2
Martin 35BB19H 1/2 ball bearing idler sprocket for #35 roller chain (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
$63.07 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". Weight: 1.5 lbs.
Brand Martin Sprocket
Model 35BB19H 3/8
$63.07 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". Weight: 1.5 lbs.
Brand Martin Sprocket
Model 35BB20H 5/8
$63.31 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". Weight: 0.51 lbs.
Brand Martin Sprocket
Model 40BB17H 5/8
$63.76 Each
Free shipping
#261275
40BB17NM 1/2
Martin 40BB17NM 1/2 ball bearing idler sprocket for #40 roller chain (1/2" pitch). 17 teeth, 1/2" finished bore, plastic construction. Sealed ball bearing tensioner for chain drives. Outside diameter: 2.975". Weight: 0.24 lbs.
Brand Martin Sprocket
Model 40BB17NM 1/2
$153.76 Each
Free Shipping orders over $100
#261276
40BB18H 1/2
Martin 40BB18H 1/2 ball bearing idler sprocket for #40 roller chain (1/2" pitch). 18 teeth, 1/2" finished bore with keyway and setscrews. Steel construction with sealed ball bearings for tensioning applications. Outside diameter: 3.140".
Brand Martin Sprocket
Model 40BB18H 1/2
$65.15 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
Brand Martin Sprocket
Model 40BB18H 5/8
$65.15 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.
Brand Martin Sprocket
Model 40BB18NM 5/8
$153.76 Each
Free Shipping orders over $100
#261279
40BB25H 5/8
Martin 40BB25H 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch). 25 teeth, 5/8" finished bore with keyway and setscrews. Steel construction, 4.260" OD. Sealed ball bearing for tensioning applications.
Brand Martin Sprocket
Model 40BB25H 5/8
$74.56 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.
Brand Martin Sprocket
Model 40BB35H 5/8
$86.04 Each
Free shipping
#261281
40BB48H 5/8
Martin 40BB48H 5/8 ball bearing idler sprocket for #40 roller chain (1/2" pitch). 48 teeth, 5/8" finished bore with keyway and setscrews. Steel construction, 7.929" OD. Sealed ball bearing tensioner for chain drives.
Brand Martin Sprocket
Model 40BB48H 5/8
$80.43 Each
Free shipping
#262194
41BB18H 1/2
Martin 41BB18H 1/2 ball bearing idler sprocket for #41 chain (1/2" pitch) with 18 teeth and 1/2" finished bore. Steel construction with sealed ball bearing for tensioning applications.
Brand Martin Sprocket
Model 41BB18H 1/2
$65.15 Each
Free shipping
#262195
41BB18H 5/8
Martin 41BB18H 5/8 ball bearing idler sprocket for #41 roller chain (1/2" pitch). 18 teeth, 5/8" finished bore with keyway and setscrews. Steel construction, 3.140" OD. Sealed bearing for tensioning or guiding roller chain drives.
Brand Martin Sprocket
Model 41BB18H 5/8
$65.15 Each
Free shipping
#262538
50BB15H 5/8
Martin 50BB15H 5/8 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 15 teeth, a 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction.
Brand Martin Sprocket
Model 50BB15H 5/8
$66.76 Each
Free shipping
#262540
50BB17H 1/2
Martin 50BB17H 1/2 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 17 teeth, a 1/2" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 3.720".
Brand Martin Sprocket
Model 50BB17H 1/2
$68.81 Each
Free shipping
#262541
50BB17H 5/8
Martin 50BB17H 5/8 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 17 teeth, a 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 3.720".
Brand Martin Sprocket
Model 50BB17H 5/8
$68.81 Each
Free shipping
#262542
50BB17NM 1/2
Martin 50BB17NM 1/2 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 17 teeth, a 1/2" finished bore, and a non-metallic (plastic) body. Designed for tensioning or guiding applications where corrosion resistance and light weight are
Brand Martin Sprocket
Model 50BB17NM 1/2
$164.55 Each
Free Shipping orders over $100
#262543
50BB18NM 5/8
Martin 50BB18NM 5/8 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 18 teeth, a 5/8" finished bore, and a non-metallic (plastic) body for corrosion resistance and quiet operation. Ideal for tensioning applications in conveyor and
Brand Martin Sprocket
Model 50BB18NM 5/8
$166.19 Each
Free Shipping orders over $100
#262544
50BB25H 3/4
Martin 50BB25H 3/4 ball bearing idler sprocket for #50 roller chain (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
$78.11 Each
Free shipping
#262545
50BB39H 3/4
Martin 50BB39H 3/4 ball bearing idler sprocket for #50 roller chain (5/8" pitch). Features 39 teeth, a 3/4" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an 8.117" outside diameter.
Brand Martin Sprocket
Model 50BB39H 3/4
$175.09 Each
Free Shipping orders over $100
#263600
60BB12H 5/8
Martin 60BB12H 5/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 12 teeth, a 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction.
Brand Martin Sprocket
Model 60BB12H 5/8
$74.33 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
Brand Martin Sprocket
Model 60BB13H 5/8
$75.00 Each
Free shipping
#263603
60BB15H 1/2
Martin 60BB15H 1/2 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 15 teeth, a 1/2" finished bore, and a sealed ball bearing for tensioning applications. Steel construction.
Brand Martin Sprocket
Model 60BB15H 1/2
$80.30 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
$80.30 Each
Free shipping
#263605
60BB15NM 1/2
Martin 60BB15NM 1/2 is a plastic ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 15 teeth, a 1/2" finished bore, and a sealed ball bearing for tensioning applications. Ideal for light-duty, corrosion-resistant, or low-noise
Brand Martin Sprocket
Model 60BB15NM 1/2
$168.67 Each
Free Shipping orders over $100
#263606
60BB16NM 5/8
Martin 60BB16NM 5/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 16 teeth, a 5/8" finished bore, and a non-metallic (plastic) body for corrosion resistance and quiet operation in tensioner applications.
Brand Martin Sprocket
Model 60BB16NM 5/8
$173.60 Each
Free Shipping orders over $100
#263607
60BB17H 5/8
Martin 60BB17H 5/8 ball bearing idler sprocket for #60 roller chain (3/4" pitch). Features 17 teeth, a 5/8" finished bore, and a sealed ball bearing for tensioning applications. Steel construction with an outside diameter of 4.460".
Brand Martin Sprocket
Model 60BB17H 5/8
$83.50 Each
Free shipping
#264841
80BB12H 3/4
Martin 80BB12H 3/4 ball bearing idler sprocket for #80 roller chain (1" pitch). Features 12 teeth, a 3/4" finished bore, and a sealed ball bearing for tensioning applications. Made of steel with an outside diameter of 4.330".
Brand Martin Sprocket
Model 80BB12H 3/4
$89.67 Each
Free shipping
#264842
80BB12NM 3/4
Martin 80BB12NM 3/4 is a plastic ball bearing idler sprocket for #80 roller chain (1" pitch). Features 12 teeth, a 3/4" finished bore, and a sealed ball bearing for tensioning applications. Ideal for light-duty, corrosion-resistant, or low-noise conveyor
Brand Martin Sprocket
Model 80BB12NM 3/4
$175.52 Each
Free Shipping orders over $100
#523067
10012463
Rexnord 101-8254-15 NT820 molded non-split drum idler wheel sprocket with 23 teeth, 25 mm round idler bore, 5.559 in (141.21 mm) pitch diameter, 7.00 in width. Constructed from LF thermoplastic material for MatTop and TableTop conveyor systems.
Brand Rexnord
Model 10012463
$20.91 Each
Free shipping
#523081
10012475
Rexnord 101-8255-18 NT820 molded non-split drum idler wheel sprocket with 25 teeth, 40 mm round idler bore, 6.031 in (153.20 mm) pitch diameter, LF thermoplastic material, 7.00 in width, 3.00 in height, 7.00 in length, no keyways or set screws.
Brand Rexnord
Model 10012475
$20.91 Each
Free shipping
#2166231
KSR15BO08101608
INA KSR15BO08101608 Chain idler sprocket
Brand INA Bearing
Model KSR15BO08101608
$52.09 Each
Free shipping
#2166232
KSR15BO10101408
INA KSR15BO10101408 Chain idler sprocket
Brand INA Bearing
Model KSR15BO10101408
$51.64 Each
Free shipping
#2166233
KSR15BO12101308
INA KSR15BO12101308 Chain idler sprocket
Brand INA Bearing
Model KSR15BO12101308
$89.52 Each
Free shipping
#2166234
KSR16LO06102008
INA KSR16LO06102008 Chain idler sprocket
Brand INA Bearing
Model KSR16LO06102008
$57.30 Each
Free shipping
#2166235
KSR16LO08101608
INA KSR16LO08101608 Chain idler sprocket
Brand INA Bearing
Model KSR16LO08101608
$45.87 Each
Free shipping
#2166236
KSR16LO08101622
INA KSR16LO08101622 Chain idler sprocket
Brand INA Bearing
Model KSR16LO08101622
$38.82 Each
Free shipping
#2166237
KSR16LO08101808
INA KSR16LO08101808 Chain idler sprocket
Brand INA Bearing
Model KSR16LO08101808
$48.18 Each
Free shipping
#2166238
KSR16LO08101809
INA KSR16LO08101809 Chain idler sprocket
Brand INA Bearing
Model KSR16LO08101809
$51.29 Each
Free shipping
#2166239
KSR16LO08101816
INA KSR16LO08101816 Chain idler sprocket
Brand INA Bearing
Model KSR16LO08101816
$51.64 Each
Free shipping
#2166240
KSR16LO10101408
INA KSR16LO10101408 Chain idler sprocket
Brand INA Bearing
Model KSR16LO10101408
$43.64 Each
Free shipping
#2166241
KSR16LO10101708
INA KSR16LO10101708 Chain idler sprocket
Brand INA Bearing
Model KSR16LO10101708
$55.75 Each
Free shipping
#2166243
KSR16LO12101308
INA KSR16LO12101308 Chain idler sprocket
Brand INA Bearing
Model KSR16LO12101308
$56.82 Each
Free shipping
#2166248
KSR20BO08101808
INA KSR20BO08101808 Chain idler sprocket
Brand INA Bearing
Model KSR20BO08101808
$93.88 Each
Free shipping
#2166251
KSR20BO12101516
INA KSR20BO12101516 Chain idler sprocket
Brand INA Bearing
Model KSR20BO12101516
$110.25 Each
Free Shipping orders over $100
#2166253
KSR20LO16101215
INA KSR20LO16101215 Chain idler sprocket
Brand INA Bearing
Model KSR20LO16101215
$114.40 Each
Free Shipping orders over $100
#2199804
IS-06B-1-21T
PTI IS-06B-1-21T metric idler sprocket with 3/8 in. pitch (06B), 21 teeth, and single strand design. This idler sprocket is used to guide or tension chain in power transmission applications. Constructed from durable steel for reliable performance.
Brand PTI
Model IS-06B-1-21T
$57.56 Each
Free shipping
#2199807
IS-08B-1-16T
PTI IS-08B-1-16T metric idler sprocket with 1/2 in. pitch (08B), single strand, and 16 teeth. Designed for use in chain drive systems where tensioning or guiding is required. Constructed from durable steel for reliable performance.
Brand PTI
Model IS-08B-1-16T
$55.34 Each
Free shipping
#2199808
IS-08B-1-18T
PTI IS-08B-1-18T metric idler sprocket with 1/2 in. pitch (08B), single strand, and 18 teeth. Designed for use in chain drive systems where tensioning or guiding is required. Constructed from durable steel for long service life.
Brand PTI
Model IS-08B-1-18T
$57.56 Each
Free shipping
#2199809
IS-10B-1-15T
PTI IS-10B-1-15T metric idler sprocket with 5/8 in. pitch (10B), single strand, and 15 teeth. Designed for use in metric chain drive systems as a non-powered idler to guide or tension the chain.
Brand PTI
Model IS-10B-1-15T
$60.92 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
#2199811
IS-12B-1-15T
PTI IS-12B-1-15T metric idler sprocket with 3/4 in. pitch (12B), single strand, and 15 teeth. Designed for use with ISO/British standard roller chain. The idler configuration provides tensioning and guidance in chain drive systems.
Brand PTI
Model IS-12B-1-15T
$65.75 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
#2199813
IS-20B-1-13T
PTI IS-20B-1-13T metric idler sprocket with 1-1/4 in. pitch (20B), single strand, and 13 teeth. Designed for use with 20B chain in conveyor and power transmission applications. This idler sprocket provides smooth chain guidance and tensioning.
Brand PTI
Model IS-20B-1-13T
$145.23 Each
Free Shipping orders over $100
#2286260
1297449
The Browning HB40A17X5/8 IDLER is a 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 is used to guide and tension chain in conveyor and power transmission drives.
Brand Browning
Model 1297449
$82.49 Each
Free shipping
#2286261
1297456
The Browning HB50A15X5/8 IDLER is a steel ANSI #50 roller chain idler sprocket with 15 teeth, a 5/8-inch finished bore, and an integral ball bearing. It has a 3.006-inch pitch diameter and a 3.32-inch outside diameter. This single-strand idler sprocket is used to guide and tension roller chain in conveyor and power transmission systems. Genuine Browning component from Regal Rexnord.
Brand Browning
Model 1297456
$110.96 Each
Free Shipping orders over $100
#2286262
1297464
The Browning HB60A13X5/8 IDLER is a steel ANSI #60 roller chain idler sprocket with 13 teeth, a 3/4" pitch, and a 5/8" finished bore. It 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
The Browning HB80A12X3/4 IDLER is a steel #80 roller chain idler sprocket with 12 teeth, a 3/4-inch finished bore, and an integral ball bearing. It has a 3.864-inch pitch diameter and a 4.33-inch outside diameter. This single-strand idler sprocket is designed for 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
#5079763
10874 PULLEY
Timken 10874 PULLEY is a ball bearing pulley or specialty unit designed for power transmission applications. This component integrates a ball bearing within a pulley assembly, facilitating smooth rotation and load support for belts or cables. It is suitable for use in conveyors, agricultural equipment, or material handling systems where a bearing-supported pulley is required.
Brand Timken
Model 10874 PULLEY
Obsolete