Mercury Quicksilver Stainless Steel Machine Screw — 817505 — 1/4-20 × 0.620 in.
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Mercury Quicksilver Stainless Steel Machine Screw 817505
Genuine Mercury Marine OEM stainless-steel machine screw for selected MerCruiser power-trim, Mercury electrical, fuel-system, and bracket assemblies. Its exact 1/4-20 thread and 0.620 in. length help restore the factory fit when matched to the correct diagram position.
Compatible Applications
- MerCruiser power-trim pump and motor assemblies, typically three screws per assembly where specified
- Selected Mercury voltage-regulator mounting applications, typically two screws where specified
- Selected Mercury fuel-filter support assemblies
- Selected Mercury oil-reservoir and bracket assemblies
Confirm the engine, drive, or trim-system serial number and the applicable parts diagram before ordering. These uses are application-specific and do not make the screw interchangeable across every Mercury assembly.
Part Details
- OEM part number: 817505
- Full service number: 10-817505
- Brand: Mercury Quicksilver
- Product type: Stainless steel machine screw
- Thread: 1/4-20 UNC
- Length: 0.620 in. / 15.7 mm
- Material: Stainless steel
- Quantity: Sold individually
Key Features
- Genuine Mercury Marine OEM fastener
- 1/4-20 UNC thread for the specified factory application
- 0.620 in. length, approximately 15.7 mm
- Stainless-steel construction for the applicable marine assembly
- Designed to be matched by part number and diagram position
Replacement Guidance
Replace the screw if the head or threads are damaged, corrosion prevents proper tightening, or the fastener is missing during trim, electrical, fuel-system, or bracket service. Follow the applicable service manual for torque, locking compound, and reuse requirements.
Technical FAQ
What size is Mercury 817505?
It is a 1/4-20 UNC stainless-steel machine screw with a 0.620 in. / 15.7 mm length.
Can 817505 replace every 1/4-20 stainless screw?
No. Match the exact part number, length, thread, and diagram location. Mercury also uses visually similar screws such as 817504, which has a different length.
How many screws are required?
Quantity depends on the assembly. MerCruiser power-trim applications commonly specify three, while selected voltage-regulator mounting applications commonly specify two. Confirm the quantity in the applicable diagram.
Related Parts
- 817504 — 1/4-20 × 1.500 in. stainless-steel screw
- 35044 — stainless-steel washer
- 850700A07 — power-trim kit
- 859725T02 — trim pump and motor assembly
Parts Desk Insights
Best use: Use 817505 when the applicable Mercury or MerCruiser diagram specifies the 1/4-20 × 0.620 in. stainless-steel screw for a trim, electrical, fuel-system, or bracket assembly.
Most common mistake: Substituting a similar-looking 1/4-20 screw without checking its length. A longer fastener such as 817504 may interfere with components or fail to match the factory assembly.
Fitment and sizing: Match the complete 10-817505 service number, 1/4-20 UNC thread, 0.620 in. / 15.7 mm length, stainless material, and diagram position before ordering.
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.