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Martin Roller Chain Sprocket, Reboreable, Type A Hub, Single Strand, 25 Chain Size

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Product Specifications
Number of Items
Brand Name
Size Name
Shaft Mounting
Style Name
Hub Style
Type A
Special Features
Single Strand
Hub Diameter
[ N/A ]  inches

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Item pitch string Number of teeth Bushing type Bore diameter string Outside diameter ASIN

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0.25 inches 18 N/A 0.25 inches 1.568 inches B00452TO9C yes $12.57 Buy Options
0.25 inches 19 N/A 0.25 inches 1.648 inches B00452TO9W yes $12.70 Buy Options
0.25 inches 20 N/A 0.25 inches 1.729 inches B00452TOAG yes $12.70 Buy Options
0.25 inches 21 N/A 0.375 inches 1.809 inches B00452TOBA yes $12.83 Buy Options
0.25 inches 22 N/A 0.375 inches 1.889 inches B00452TOBU yes $12.94 Buy Options
0.25 inches 23 N/A 0.375 inches 1.969 inches B00452TOCE yes $13.16 Buy Options
0.25 inches 24 N/A 0.375 inches 2.049 inches B00452TOCY yes $13.31 Buy Options
0.25 inches 25 N/A 0.375 inches 2.129 inches B00452TODI yes $13.54 Buy Options
0.25 inches 26 N/A 0.375 inches 2.209 inches B00452TOE2 yes $13.92 Buy Options
0.25 inches 28 N/A 0.375 inches 2.369 inches B00452TOEM yes $14.26 Buy Options
0.25 inches 30 N/A 0.375 inches 2.529 inches B00452TOF6 yes $14.25 Buy Options
0.25 inches 32 N/A 0.375 inches 2.688 inches B00452TOFQ yes $16.87 Buy Options
0.25 inches 35 N/A 0.375 inches 2.928 inches B00452TOGA Usually ships in 24 hours $17.35 Buy Options
0.25 inches 36 N/A 0.375 inches 3.008 inches B00452TOGU yes $17.43 Buy Options
0.25 inches 40 N/A 0.5 inches 3.327 inches B00452TOHO yes $17.76 Buy Options
0.25 inches 42 N/A 0.5 inches 3.486 inches B00452TOI8 yes $18.12 Buy Options
0.25 inches 45 N/A 0.5 inches 3.725 inches B00452TOIS yes $18.24 Buy Options
0.25 inches 48 N/A 0.5 inches 3.964 inches B00452TOJC yes $18.58 Buy Options
0.25 inches 54 N/A 0.5 inches 4.442 inches B00452TOJW yes $19.29 Buy Options
0.25 inches 60 N/A 0.5 inches 4.92 inches B00452TOKQ yes $19.70 Buy Options

Key Features

  • For use with series 25 chain, 1/4" pitch for driver or driven sprocket applications
  • Type A sprocket offers flexibility in mounting arrangements
  • Shaft diameter size from 1/4" to 1/2" for a variety of applications
  • Can be used with large-diameter shafts, and drilled for mounting or welded directly to other apparatuses
  • High carbon steel for strength and durability

Product Description

The Martin type A sprocket is suitable for use with the series 25 chain with 1/4” pitch for driver or driven sprocket applications. This sprocket has a narrow profile and no hub extension, and is easily adaptable for bushings, bearings, and sleeves. Varying numbers of teeth, outside diameters and stock bore sizes offer application flexibility. Made from high carbon steel, it has high strength and durability.

The options for this class of sprocket are: number of teeth from 18 to 72; outside diameter from 1.568” to 5.876”; stock bore size from 1/4” to 1/2”; and approximate weight from 0.04 lbs. to 0.74 lbs. The tooth width is 0.110” nominal. The maximum bore size will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at angle to keyseat. All Martin sprockets meet or exceed ANSI standards.

A sprocket is a wheel with teeth around the perimeter that meshes with a chain, track, or other perforated or indented material. Unlike gears that mesh with another gear, sprockets mesh with a chain, which then interacts with another sprocket. Gears can be used to transmit power around a corner, based on how they fit together. Sprockets with chains only work in straight lines. Some common benefits of chain-drive systems include minimal slippage, a fixed ratio between rotating shafts, and versatility with many different chain attachments and sprocket material selections. An example of a power transmission system is a standard bicycle, which has a sprocket and a chain to deliver power from the rider’s legs to the wheels making the bike move.

Martin Sprocket & Gear manufactures power transmission and conveying products. The company was founded in 1951 and is headquartered in Arlington, TX. Martin provides tools that meet ANSI, NAS and DIN standards.

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