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Browning® 1297225 Idler Sprocket With Hardened Teeth, 1-1/2 in Dia Bore, 1.65 in OD, 25 Chain, 19 Teeth, 1/4 in Pitch, Steel

Browning® 1297233 Single Strand Idler Sprocket With Hardened Teeth, 1/2 in Dia Bore, 1-3/4 in OD, 35 Chain, 13 Teeth, 3/8 in Pitch, Steel

Browning® 1297241 Single Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 2.47 in OD, 35 Chain, 19 Teeth, 3/8 in Pitch, Steel

Browning® 1297266 Single Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 3.28 in OD, 41 Chain, 19 Teeth, 1/2 in Pitch, Steel

Browning® 1297274 Single Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 3.72 in OD, 50 Chain, 17 Teeth, 5/8 in Pitch, Steel

Browning® 1297282 Single Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 4.46 in OD, 60 Chain, 17 Teeth, 3/4 in Pitch, Steel

Browning® 1297290 Single Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 4.66 in OD, 80 Chain, 13 Teeth, 1 in Pitch, Steel

Browning® 1297373 Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 3.28 in OD, 40-2 Chain, 19 Teeth, 1/2 in Pitch, Steel

Browning® 1297381 Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 3.72 in OD, 50-2 Chain, 17 Teeth, 5/8 in Pitch, Steel

Browning® 1297399 Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 4.46 in OD, 60-2 Chain, 17 Teeth, 3/4 in Pitch, Steel

Browning® 1297407 Double Strand Idler Sprocket With Hardened Teeth, 1 in Dia Bore, 4.66 in OD, 80-2 Chain, 13 Teeth, 1 in Pitch, Steel

Browning® 1297449 Single Strand Idler Sprocket With Hardened Teeth, 5/8 in Dia Bore, 2.96 in OD, 40 Chain, 17 Teeth, 1/2 in Pitch, Steel

Browning® 1297464 Idler Sprocket, 0.635 in Dia Bore, 3.49 in OD, 60 Chain, 13 Teeth, 3/4 in Pitch, Steel

Browning® 1297472 Single Strand Idler Sprocket With Hardened Teeth, 3/4 in Dia Bore, 4.33 in OD, 80 Chain, 12 Teeth, 1 in Pitch, Steel

Martin idlers are smooth-running and available in oil-impregnated, sintered bronze, extra-duty bearing press-fitted in sprocket and a hardened steel journal case for maximum resistance to wear. Steel sprockets used in Martin idlers are accurately machined (not stamped) the same as sprockets normally supplied for power transmission use. Martin can also alter existing sprockets and install bearings to make custom idlers.

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This type of sprocket is commonly used in applications where two or more items are powered by a common drive shaft. The space between the sprocket plates is wider than a multi-strand sprocket and allows two separate strands of chain to engage without contacting each other. With this type of sprocket, one strand of chain may exit in a different direction than the other. For example, one strand exiting towards the ceiling and the other running parallel to the floor.

Hub type metric sprockets are available with a minimum plain bore (pilot bore) and some stock finished bore sizes. Any shaft size is possible with our custom bore and keyway capability. Sprockets with hubs are typically fitted to the shaft as a clearance fit. They are held in place with two set screws and a keyway. Clearance fits are popular for light loads and slow speeds. A press fit (or shrink fit to the shaft) is usually preferred for higher speeds or heavier loads as they fit to the shaft more securely than a clearance fit sprocket. Depending on the clearance of the shaft fit, sprockets may work slightly on the shaft causing possible fretting or shaft wear. All sprockets are available with hardened teeth from stock or on request. Press fits usually require the sprocket to be heated for installation to expand the bore. As a heated sprocket cools, it shrinks, conforming to the shaft with a tight grip. A set screw can be used to secure the key. The TL taper bushed sprocket will function like the press fit sprocket and is generally easier to install.

Browning® offers type A plate steel sprockets in single strands. Offerings include 25 to 200 pitch range.

If you need any additional information, prices, availability, etc. please contact us at 1-800-290-9908 or e-mail us at

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