PREPARE FOR WINTER: 10-50% discount on all OEM parts!

Unless prohibited by manufacturer. Does not include aftermarket or Crowley Marine branded products. Priced as marked.

Honoring all who served: veterans, active military and first responders save 5% on OEM parts all year round. Our warehouses and customer support are open on Veterans Day, November 11th.

Contact Us
Overstock
Up to 50% off
Search Over 1 Million OEM Parts
Easy-to-use  parts diagrams Best price  guarantee Expert  live support 50+ years  of serving boaters Huge selection of OEM parts  -  from 1950 to 2026 Most parts in stock  -  Same day fulfillment
Most parts in stock- Same day fulfillment
Where is my model number?

Select your engine to find guaranteed-fit parts:

Mercury Marine

(.500-20 x 4.500) Screw 677551

Price not available
No longer available
  • This is an OEM part manufactured by Mercury Marine
  • 30 day return policy
    •
Mercury Marine logo
Our verified social media accounts

Beware of impersonators

Refresh
Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.