# Martin 40B21SS Type B Plain Bore Sprocket #40 Chain 1/2" Pitch 21 Teeth Stainless Steel 3.618" OD - MROSupply.com

***Martin 40B21SS Type B plain bore roller chain sprocket for #40 chain (1/2" pitch), 21 teeth, stainless steel (304 SS) construction. Hub on one side for re-boring. Outside diameter: 3.618".***



## Product details:

- Catalog number: 40B21SS
- SKU: 261967
- Price: ***$222.40*** 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 Plain Bore Sprockets](htts://www.mrosupply.com/chains-sprockets/sprockets/roller-chain-sprockets/plain-bore-sprockets/type-b-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: 1.780 lb
- Technicall support: contact supplier for technical support on 323-728-8117


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


## Product attributes;

  
- Material: Stainless Steel
  

  
- Number Of Teeth: 21
  

  
- Outside Dia: 3.618"
  

  
- Pitch: 0.500 in.
  

## Alternate products to `Martin 40B21SS Type B Plain Bore Sprocket #40 Chain 1/2" Pitch 21 Teeth Stainless Steel 3.618" OD - MROSupply.com`:
- [U.S. Tsubaki 40B21SS #40 roller chain sprocket with 21 teeth and Type B single hub. Plain bore (stock bore) for custom machining. Pitch 0.500 in, outside diameter 3.620 in. Suitable for ANSI #40 roller chain drives in industrial power transmission and conveyor applications.](https://www.mrosupply.com/products/396904/as-markdown/)
- [Linn-Gear 40B21SS Stainless Steel Sprocket H1](https://www.mrosupply.com/products/571077/as-markdown/)
## Suggested products:
- [Martin 40B21SS Type B plain bore roller chain sprocket for #40 chain (1/2" pitch), 21 teeth, stainless steel (304 SS) construction. Hub on one side for re-boring. Outside diameter: 3.618".](https://www.mrosupply.com/products/261967/as-markdown/)
- [HKK RC040R1A (alt. 40R10) is a standard ANSI 40 single strand roller chain with 1/2" pitch, 10 ft reel. Features solid bushings and rollers, pin diameter 0.156", plate height 0.457", roller diameter 0.312", roller width 5/16". Average ultimate strength 4,300 lbs, maximum allowable load 940 lbs. ANSI B29.1 compliant, made in Japan.](https://www.mrosupply.com/products/2265612/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 40A12 Type A plain bore roller chain sprocket for #40 chain, 1/2" pitch, 12 teeth, 2.166" 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/261212/as-markdown/)
- [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/)

## Product's reviews:
- Nice sprocket - sprocket is very nice.
- Great service - Very quick service part was exactly what I needed to get my skid steer going again great product and I will definitely use this business again
- Plate gear - Just what I ordered at a reasonable price. Thank you, Dallas
- Spur gear - Our Yellow Karcher "Duckee" steers once more.
The spur gear works as advertised!!!