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12B21 Metric Roller Chain Sprocket

BRAND: Martin Sprocket | MODEL: 12B21 | CONDITION: NEW | SKU: 259005
12B21 Metric Roller Chain Sprocket

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Actual product may vary
Typically In Stock: confirm availability
Returnable: see conditions
Shipping from?: see locations Typically ships in 1 day
Weight: 5.00 lbs UOM: EA

Additional Description

Technical Specifications

Pitch 19.050 mm
Number Of Teeth 21
Outside Dia 139.564 mm
Material Steel
Pitch Diameter 127.816 mm


Metric B Style sprockets are flat sprockets with a hub extension on one side. 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 30.112 mm
Chain Number 12B-1 Hub Configuration B
Chain Pitch 19.050 mm Hub Outside Diameter 100.000 mm
Number of Chain Rows 1 Length thru Bore 40.005 mm
Number of Teeth 21 Construction Detail Solid
Outside Diameter 139.564 mm Bore Type Stock Bore
Pitch Diameter 127.816 mm Min Bore Size 20.000 mm
Single Strand Tooth Thickness 11.100 mm Max Bore Size 64.000 mm
Storage Dimension Length 5.495 in. Weight 5.91 lbs.
Storage Dimension Width 5.495 in. Individually Packaged No
Storage Dimension Height 1.575 in.