# Martin 40A21 Type A Plain Bore Roller Chain Sprocket #40 Chain 21 Teeth 1/2" Pitch Steel - MROSupply.com

***Martin 40A21 Type A plain bore roller chain sprocket for #40 chain (1/2" pitch), 21 teeth, 3.617" outside diameter, steel construction. Flat plate design with no hub for lightweight applications.***



## Product details:

- Catalog number: 40A21
- SKU: 261221
- Price: ***$27.78*** 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 A Plain Bore Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/plain-bore-sprockets/type-a-plain-bore-sprockets/)
    - [Plain Bore Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/plain-bore-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: 0.590 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.
  

## Suggested products:
- [Martin 40A13 Type A plain bore roller chain sprocket for #40 chain with 1/2" pitch, 13 teeth, and 2.329" outside diameter. Flat plate design with no hub, steel construction. Suitable for light-duty applications where a simple, economical sprocket is required.](https://www.mrosupply.com/products/261213/as-markdown/)
- [Renold Jeffrey 40-1R PREMIUM ROLLER CHAIN 10 RIVETED](https://www.mrosupply.com/products/2182855/as-markdown/)
- [Martin 40A112 Type A plain bore roller chain sprocket for #40 chain, 1/2" pitch, 112 teeth, 18.121" outside diameter. Flat plate design with no hub, steel construction. Suitable for applications requiring a lightweight, compact sprocket where hub projection is not needed.](https://www.mrosupply.com/products/261211/as-markdown/)
- [Martin 40A14 Type A plain bore roller chain sprocket for #40 chain (1/2" pitch) with 14 teeth. Flat plate design with no hub, made of steel. Outside diameter: 2.491". Compatible with ANSI B29.1 standard chain.](https://www.mrosupply.com/products/261214/as-markdown/)
- [Martin 40A21 Type A plain bore roller chain sprocket for #40 chain (1/2" pitch), 21 teeth, 3.617" outside diameter, steel construction. Flat plate design with no hub for lightweight applications.](https://www.mrosupply.com/products/261221/as-markdown/)

## Product's reviews:
- Free freight ! - Easy to do business with
- Solid product at a great price - Solid product, fair and super fast shipping! MROSUPPLY delivers it all!
- Spur gear - Our Yellow Karcher "Duckee" steers once more.
The spur gear works as advertised!!!
- Service manager - on time.. great company thanks john gorth