Nylon Insert Locknut - Stainless 5/16-18
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Secure connections with this stainless nylon insert locknut sized for 5/16-18 threads. The nylon insert adds resistance to loosening from vibration, making it a practical choice for marine fastener applications.
Key Features
- Nylon insert helps resist loosening from vibration
- Stainless steel construction for corrosion resistance
- 5/16-18 thread size for compatible hardware
Intended Use
- Marine fasteners and general mounting hardware
- Typical boat and watercraft assemblies where thread locking is beneficial
- General mechanical fastening applications requiring a nylon insert locknut
Product Details
- Product: Nylon Insert Locknut - Stainless 5/16-18
- Finish/Material: 18-8 stainless steel
- Thread Size: 5/16-18
- Product SKU (variant): 50-00626
- Weight (per variant): 340 g
Parts Desk Insights
Best Use Case: Use as a thread-locking nut on studs or bolts where vibration may work fasteners loose—common in marine hardware and other equipment exposed to movement.
Common Issues: If a locknut feels overly tight to install, verify thread pitch (5/16-18) and that mating threads are clean and undamaged; cross-threading can damage both the nut’s threads and the nylon insert performance.
Related Products & Accessories
- Fasteners & Mounting - Browse the Fasteners & Mounting collection for additional nuts, bolts, and lock hardware.
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.