# Martin D40B21H Double Strand #40 Chain Sprocket 1/2" Pitch 21 Teeth Type B Plain Bore Steel - MROSupply.com

***Martin D40B21H double strand roller chain sprocket for #40 chain, 1/2" pitch, 21 teeth, Type B plain bore with hub on one side, steel, 3.617" outside diameter. Designed for power transmission applications requiring double strand drive.***



## Product details:

- Catalog number: D40B21H
- SKU: 256540
- Price: ***$81.78*** 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 B Multi-Strand Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/multi-strand-sprockets/type-b-multi-strand-sprockets/)
    - [Multi-Strand Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/multi-strand-sprockets/)
    - [Roller Chain Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/)
    - [Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/)
    - [Chains & Sprockets](htts://www.mrosupply.com/chains-sprockets/)
- Unit of measure: each
- Weight: 2.940 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: 3.617"
  

  
- Pitch: 0.500 in.
  


## Product's reviews:
- Perfect - Perfect replacement part, Good purchase experience. I would use MRO again.
- Martin flex sleeve - Great inventory easy to use website,had exactly what I needed,up and running,would use them again without a doubt, thank you!
- Sprocket lm - Good quality product, arrived on time, will continue to buy from this company
- Great prices and quality products - Your products are not only affordable, but they are also priced very fairly and competitively & always ship out pretty quickly. You have gained a new regular customer and stolen us from one of our regular distributors without even trying. Thank you for being awesome! Not to mention the free shipping over $100 perk is super appreciated as we not only are saving money per item, but we are also able to buy in bulk without the additional burden of freight/shipping costs.
THANK YOU!! :)