Lag Screw, 5/16 x 3"
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Secure marine and outdoor mounting with this 5/16 x 3" lag screw made from 18-8 stainless steel. Designed for strong fastening where corrosion resistance matters.
Key Features
- Size: 5/16 x 3"
- Material: 18-8 stainless steel
Intended Use
- Marine fastener applications
- General hardware/mounting projects (use with appropriate predrilling for lag screws)
Product Details
- Lag screw size: 5/16 x 3"
- Finish/Material: 18-8 Stainless Steel
- SKU (variant): 50-00178
Parts Desk Insights
Best Use Case: Use for mounting jobs that require a strong, threaded fastener with corrosion-resistant stainless steel—such as installing hardware to structural or weather-exposed surfaces.
Common Issues: Lag screws typically require proper pilot-hole sizing for the material you’re fastening into. If you don’t predrill (or drill the correct diameter), you can split wood or create poor fastening strength in other substrates.
Related Products & Accessories
- Browse Fasteners & Mounting - Find matching marine fasteners, mounting hardware, and stainless components for the same project.
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.