# Martin 78A21 Type A Plain Bore Sprocket #78 Chain 2.609" Pitch 21 Teeth Steel 18.310" OD - MROSupply.com

***Martin 78A21 Type A plain bore roller chain sprocket for #78 chain with 2.609-inch pitch, 21 teeth, and 18.310-inch outside diameter. Steel construction with flat plate design and no hub, suitable for light-duty applications where a plain bore is required.***



## Product details:

- Catalog number: 78A21
- SKU: 264695
- Price: ***$546.39*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Martin Sprocket](https://www.mrosupply.com/brands/martin-sprocket/)
- Category: 
    - [Type A Engineered Class Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/engineering-chain-sprockets/type-a-engineered-class-sprockets/)
    - [Engineering Chain Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/engineering-chain-sprockets/)
    - [Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/)
    - [Chains & Sprockets](htts://www.mrosupply.com/chains-sprockets/)
- Unit of measure: each
- Weight: 61.000 lb
- Technicall support: contact supplier for technical support on 323-728-8117


## Product images:
- https://static.mrosupply.com/images/noimage.webp


## Product attributes;

  
- Material: Steel
  

  
- Number Of Teeth: 21
  

  
- Outside Dia: 18.310"
  

  
- Pitch: 2.609 in.
  


## Product's reviews:
- Service - qUICK SERVICE ON THIS ORDER
- Service manager - on time.. great company thanks john gorth
- Spur gear - Our Yellow Karcher "Duckee" steers once more.
The spur gear works as advertised!!!
- Great service and selection - I was very pleased to find this on the shelf. The price was fair, and the delivery was prompt.
I will do business again with MRO