Mercury MerCruiser Quicksilver Internal-Tooth Lockwasher 72521
In stock items ship same or next day.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Product Description
Mercury MerCruiser Quicksilver 13-72521 is an internal-tooth lockwasher used in specified Mercury outboard and MerCruiser drive assemblies. Its inward-facing teeth provide the locking interface at the fastener joint identified in the parts diagram.
Key Features
- OEM internal-tooth lockwasher.
- Full catalog number: 13-72521; bare part reference: 72521.
- GTIN: 745061173941.
Product Compatibility
Verified catalog locations include the Bravo Three gear-housing / propeller-shaft anode hardware and the driveshaft-housing / exhaust-tube assembly on Mercury 250HP XB outboards in serial range 0G980600–0T800999. It is also listed in specified 25HP Lightning remote-control linkage assemblies.
Fitment and Installation
Select this washer by the exact assembly callout rather than by visual similarity to an external-tooth or tab washer. Replace a damaged or flattened lockwasher and inspect the mating screw, nut and seating face. Follow the service procedure for the joint’s torque and locking requirements.
Parts Desk Insight
The same washer appears in several systems. The diagram location determines which accompanying fastener and other washers are required.
Manufacturer Parts Lookup
Use Mercury’s official parts finder to check the part against your engine or drive serial number.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.