# TB Woods M378 Sure-Grip QD Bushing - M Series, 3-7/8" Bore - MROSupply.com

***TB Woods M378 Sure-Grip QD bushing in the M series with a 3-7/8" finished bore. Cast-iron body with standard ANSI keyway and four 3/4-10 capscrews, rated for 125,000 in-lb torque capacity. Designed for the industry-standard QD interface on sheaves, sprockets, and couplings.***



## Product details:

- Catalog number: M378
- SKU: 337895
- Price: ***$618.67*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [TB Woods](https://www.mrosupply.com/brands/tb-woods/)
- Category: 
    - [Type M](htts://www.mrosupply.com/bushings/quick-disconnect-bushings/type-m/)
    - [Quick Disconnect Bushings](htts://www.mrosupply.com/bushings/quick-disconnect-bushings/)
    - [Bushings](htts://www.mrosupply.com/bushings/)
- Unit of measure: each
- Weight: 47.600 lb
- Technicall support: contact supplier for technical support on 888-829-6637


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


## Product attributes;

  
- Bolt circle: 7.88
  

  
- Bore: 3.875
  

  
- Bore (in): 3 7/8
  

  
- Capscrew designation (screw thread size): 3/4 10
  

  
- Capscrew length: 6.75
  

  
- Design: Standard
  

  
- Dimension: 6.75
  

  
- Hardware: Inch series
  

  
- Installation torque: 225
  

  
- Key size: 30
  

  
- Keyway: SHALLOW
  

  
- Mounting: Standard
  

  
- Number of capscrews: 4
  

  
- Rating (in lbs): 125000
  

  
- Series: Sure-Grip® bushing
  

  
- Size: M
  

  
- TBW group no.: 11320
  

  
- Torque capacity: 125000
  

  
- Type: OD
  
## Product documents / software:

- [Catalog Product Section](https://documents.mrosupply.com/product_documents/N4/N412/sec-a1_yYxsZio.pdf)
- [Full Catalog](https://documents.mrosupply.com/product_documents/N4/N412/p-1687-tbw_ORsxZDt.pdf)
- [Installation And Maintenance Manual](https://documents.mrosupply.com/product_documents/N4/N412/p-5070-tbw_46RSr5N.pdf)
## Alternate products to `TB Woods M378 Sure-Grip QD Bushing - M Series, 3-7/8" Bore - MROSupply.com`:
- [Dodge 119921 Type M Quick Disconnect (QD) bushing with 3-7/8" bore, 1" x 1/2" keyway, and ductile iron construction. Designed for 4-bolt finished bore shaft attachment, this bushing provides reliable power transmission in industrial applications. Ductile iron offers high strength and impact resistance for demanding environments.](https://www.mrosupply.com/products/119398/as-markdown/)
- [Martin M 3 7/8 Type M Quick Disconnect bushing with 3-7/8" bore, cast iron construction, and 1" x 1/2" keyway. Provides 85,000 in-lb torque capacity for heavy-duty power transmission applications. Interchangeable with industry-standard QD bushings of the same size designation.](https://www.mrosupply.com/products/247761/as-markdown/)
- [Browning M 3 7/8 1075076 Q-D Quick Disconnect bushing with a 3-7/8-inch bore in the M series. Gray iron construction with a 6.5-inch outer diameter and keyway for secure shaft mounting. The Q-D tapered design allows fast installation and removal without disturbing surrounding components. Compatible with all Browning Q-D bushed sheaves, sprockets, and pulleys.](https://www.mrosupply.com/products/2287810/as-markdown/)

## Product's reviews:
- Tb woods - Excelent recomiendo 100%
- Sleeve - Thanks for quick service and delivery was not long!
- Didn’t use yet - I really didn’t use them yet but the belts I received were actually Carlisle belts which are made by Timken. I had ordered a belt that I knew was Carlisle at the same time to try out the difference brands and it was the same belt. The only difference was the TB Woods belt was $10 more per belt so you might as well just buy the Carlisle/ Timken directly.
- Sales - I have all good experiences with your staff.
Thank you for the support.