# Martin 100A21 Type A Plain Bore Roller Chain Sprocket #100 Chain 1-1/4" Pitch 21 Teeth Steel 9.043" OD - MROSupply.com

***Martin 100A21 Type A plain bore roller chain sprocket for #100 chain with 1-1/4" pitch, 21 teeth, and 9.043" outside diameter. Flat plate design with no hub for light-duty applications. Steel construction.***



## Product details:

- Catalog number: 100A21
- SKU: 258508
- Price: ***$104.34*** 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: 9.800 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: 9.043"
  

  
- Pitch: 1.250 in.
  

## Suggested products:
- [Martin 100A21 Type A plain bore roller chain sprocket for #100 chain with 1-1/4" pitch, 21 teeth, and 9.043" outside diameter. Flat plate design with no hub for light-duty applications. Steel construction.](https://www.mrosupply.com/products/258508/as-markdown/)
- [HKK RC100R1A (alt. 100R10) is a 100 single strand roller chain with 1-1/4" pitch on a 10 ft reel. Features solid bushings and rollers, 0.375" pin diameter, 1.154" plate height, 0.750" roller diameter, 3/4" roller width, and 0.156" plate thickness. Average ultimate strength 26,200 lbs, maximum allowable load 6,600 lbs. ANSI B29.1 compliant. Made in Japan.](https://www.mrosupply.com/products/2265703/as-markdown/)
- [Martin 100A13 Type A plain bore roller chain sprocket for #100 chain, 1-1/4" pitch, 13 teeth, 5.821" outside diameter. Steel flat plate design with no hub for lightweight applications. Suitable for standard roller chain drives where re-boring is not required.](https://www.mrosupply.com/products/258495/as-markdown/)
- [Martin 100A11 Type A plain bore roller chain sprocket for #100 chain, 1-1/4" pitch, 11 teeth, 5.007" outside diameter, steel. Flat plate design with no hub for lightweight applications. Requires boring to size for installation.](https://www.mrosupply.com/products/258493/as-markdown/)
- [Martin 100A12 Type A plain bore roller chain sprocket for #100 chain, 1-1/4" pitch, 12 teeth, steel construction. Flat plate design with no hub, 5.415" outside diameter. Suitable for applications requiring a lightweight, compact sprocket that can be bored to size.](https://www.mrosupply.com/products/258494/as-markdown/)

## Product's reviews:
- Plate gear - Just what I ordered at a reasonable price. Thank you, Dallas
- Martin s1036 gears - Great Item, for a great deal!
- High quality - strong material
- Durable and high quality - I bought a second one to keep as a spare, but the first one still hasn’t shown any signs of wear. Seems like a quality part.