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D28B21 Metric Double Roller Chain Sprocket

$1,112.30 Each


  • Typically ships in: 1 day
  • Weight: 102.9 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 88.392 mm
Chain Number 28B-2 Hub Configuration B
Chain Pitch 44.450 mm Hub Outside Diameter 178.003 mm
Number of Chain Rows 2 Length thru Bore 120.015 mm
Number of Teeth 21 Construction Detail Solid
Outside Diameter 325.860 mm Bore Type Stock Bore
Pitch Diameter 298.238 mm Min Bore Size 40.000 mm
Single Strand Tooth Thickness 28.829 mm Max Bore Size 126.000 mm
Storage Dimension Length 12.829 in. Weight 102.90 lbs.
Storage Dimension Width 12.829 in. Individually Packaged No
Storage Dimension Height 4.725 in.


Number Of Teeth 21
Outside Dia 325.860 mm
Material Steel
Pitch Diameter 298.238 mm
Pitch 44.450 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