# Martin J 4 QD Bushing Type J 4" Bore Ductile Iron Quick Disconnect Bushing - MROSupply.com

***Martin J 4 Type J Quick Disconnect bushing with 4" bore, ductile iron construction, and 1" x 1/8" keyway. Industry-interchangeable QD bushing for mounting sprockets, sheaves, and couplings. Includes setscrews for secure shaft attachment.***



## Product details:

- Catalog number: J 4
- SKU: 247649
- Price: ***$295.09*** 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 J](htts://www.mrosupply.com/bushings/quick-disconnect-bushings/type-j/)
    - [Quick Disconnect Bushings](htts://www.mrosupply.com/bushings/quick-disconnect-bushings/)
    - [Bushings](htts://www.mrosupply.com/bushings/)
- Unit of measure: each
- Weight: 15.160 lb
- Technicall support: contact supplier for technical support on 323-728-8117


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


## Product attributes;

  
- Bore Size: 4"
  

  
- Keyway: 1" x 1/8"
  

  
- Material: Ductile Iron
  

## Alternate products to `Martin J 4 QD Bushing Type J 4" Bore Ductile Iron Quick Disconnect Bushing - MROSupply.com`:
- [TB Woods J4 Sure-Grip QD bushing in the J series with a 4" finished bore. Cast-iron construction with shallow keyway and three 5/8-11 capscrews. Rated for 55,000 in-lb torque capacity with 135 ft-lb installation torque. Suitable for conventional or reverse mounting on QD-bored sheaves and sprockets.](https://www.mrosupply.com/products/338401/as-markdown/)

## Product's reviews:
- Good stock - I was pleased with the help of customer service to answer my questions concerning inventory and how quickly I received my product. Thank you.
- Service manager - on time.. great company thanks john gorth
- 21 tooth 12 dp spur gear - The 21 tooth 12 DP gear I bought arrived very quickly.
It was exactly what I needed to fix my RV slide out.
I had to machine it to fit, but I knew that when I ordered it.
VERY SATISFIED!!!
- 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