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D20B12 Metric Double Roller Chain Sprocket

$237.72 Each


  • Typically ships in: 1 day
  • Weight: 9.5 lb
  • Free shipping on orders over $20
  • Contiguous U.S. States

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Additional Description

Martin metric double strand solid construction sprockets have proper spacing between chain rows. The sprockets are manufactured from high carbon steel. Martin does not stack “A” plates on multiples, but instead Martin machines teeth after the chain rows are already in place. These plain bore sprockets can easily be bored to a metric or standard size to fit your application. Keyways, set screws and harden teeth are quick alterations that can be made.
Material Steel Width across Teeth/ Rows 54.635 mm
Chain Number 20B-2 Hub Configuration B
Chain Pitch 31.750 mm Hub Outside Diameter 89.992 mm
Number of Chain Rows 2 Length thru Bore 80.010 mm
Number of Teeth 12 Construction Detail Solid
Outside Diameter 143.310 mm Bore Type Stock Bore
Pitch Diameter 122.673 mm Min Bore Size 20.000 mm
Single Strand Tooth Thickness 18.186 mm Max Bore Size 63.000 mm
Storage Dimension Length 5.642 in. Weight 10.81 lbs.
Storage Dimension Width 5.642 in. Individually Packaged No
Storage Dimension Height 3.150 in.


Number Of Teeth 12
Outside Dia 143.310 mm
Material Steel
Pitch Diameter 122.673 mm
Pitch 31.750 mm

Return policy

Item must be unused.

Item must be in it's original package.

Restocking, shipping and handling fees may apply to any return with this manufacturer.

For more information please consult


Product's availability

State of California Proposition 65 Product Warning