Mercury Marine — Stainless Steel Screw, 1/4-20 x 1/2 in. — 41508
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury Marine Stainless Steel Screw, 1/4-20 x 1/2 in. – Part 41508
This genuine OEM stainless-steel screw is used across several Mercury Marine electrical, grounding, and mounting applications, including outboard ground-wire attachment, MerCruiser continuity/bonding assemblies, and starter-solenoid mounting.
Part Details
- Part number: 41508
- Full service number: 10-41508
- Brand: Mercury Marine / MerCruiser / Quicksilver
- Product type: Stainless steel machine screw
- Thread: 1/4-20 UNC
- Length: 0.500 in. / 12.7 mm
- Material: Stainless steel
- Condition: Genuine OEM, new
Compatible Applications
- Mercury outboard ground-wire attachment
- Selected MerCruiser continuity/bonding kits
- Selected starter-solenoid mounting
- Driveshaft-housing electrical grounding assemblies
Mercury diagrams commonly show one 41508 screw per applicable assembly. Confirm your engine or drive serial number and diagram position before ordering, since Mercury uses several similar 1/4-20 stainless screws in electrical and grounding assemblies.
When to Replace
Replace this screw if the threads or head are damaged, corrosion prevents proper tightening, or the fastener is missing during electrical or grounding-system service.
Installation Notes
Install in the original factory location with the matching washer, lockwasher, ground cable, or component shown in the Mercury diagram. Grounding and bonding connections should be clean and secure before final tightening.
Technical FAQ
Can I substitute a generic 1/4-20 screw? Because this part is often used in grounding and bonding connections, matching the exact stainless construction, thread, and 1/2 in. length is important rather than substituting a similar-looking fastener.
How do I confirm fitment? Match part number 41508 (full service number 10-41508) against your Mercury diagram and serial number range.
Parts Desk Insights
This screw is best used when servicing Mercury or MerCruiser ground-wire, bonding/continuity, or starter-solenoid mounting points that call for part 41508. The most common mistake is swapping in a generic 1/4-20 screw of similar length, which can compromise the grounding or bonding connection over time. For sizing, confirm both the 1/4-20 thread and the exact 1/2 in. length against the diagram, since several visually similar Mercury screws exist at other lengths.
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.