Mercury Quicksilver Screw 5/16"-18 × 3/4" 25299
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Mercury Quicksilver Screw 5/16"-18 × 3/4" — Part 25299
A genuine Quicksilver OEM screw for Mercury and MerCruiser assemblies, catalogued as 10-25299. Thread size is 5/16"-18 (UNC) × 3/4" length. This part is no longer in current production; we carry a limited quantity of original old-stock inventory. Order while available.
Key Features
- Genuine Quicksilver OEM fastener
- Part number: 25299 / 10-25299
- Thread: 5/16"-18 UNC × 3/4" length
- Original factory specification — not aftermarket
- Limited old-stock availability
Fitment & Application
Use this screw where the Mercury or MerCruiser parts diagram specifies part number 25299 or 10-25299. Fitment varies by engine model, drive type, and serial number range — always confirm against your specific parts diagram before ordering.
When to Replace
Replace when the screw is corroded, stripped, rounded, stretched, or has been removed from a critical assembly during service and cannot be safely reused. Fasteners in high-vibration or water-exposed positions should be inspected at every service interval.
Installation Notes
Confirm thread pitch, length, diameter, and finish against the diagram position before installation. Follow the Mercury service manual for torque specifications, locking compound requirements, and reuse limits. Do not substitute a generic fastener in a position that specifies an OEM part.
Related Products
- Mercury MerCruiser Screw .250-20 × .625 — 14070 — 1/4"-20 UNC screw for Mercury / MerCruiser assemblies
- Mercury MerCruiser Quicksilver Screw .312-24 × 1.12 — 20639 — Fine-thread 5/16"-24 screw variant
- Mercury MerCruiser Quicksilver Screw .312-18 × 3.500 — 74822 — Same thread, longer 3.5" length variant
- Mercury MerCruiser Quicksilver Stainless Screw 28635 — Stainless OEM screw for corrosion-critical positions
Parts Desk Insights
Best use case: This screw is the correct choice when the Mercury or MerCruiser parts diagram specifically calls out 10-25299 and an OEM-spec fastener is required. Because this part is no longer in production, it's worth ordering a small quantity of spares if you're servicing an assembly that uses it in multiple positions — once current stock is gone, a cross-reference to a standard 5/16"-18 × 3/4" grade fastener with the correct finish may be the only option. Always verify thread pitch and length against the diagram before substituting.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.