Nylon Insert Locknut - Stainless 5/8-11
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Secure your 5/8-11 threaded connections with this stainless nylon insert locknut designed to help resist loosening from vibration.
Key Features
- Stainless steel construction for corrosion resistance
- Nylon insert helps increase thread friction to reduce back-off
- Locknut style for more secure fastening on 5/8-11 coarse threads
Intended Use
- Marine and boating fastener connections subject to vibration
- General hardware fastening where a nylon-insert locknut is preferred
- Projects using 5/8-11 coarse threaded studs/bolts
Product Details
- Brand/Type: Nylon Insert Locknut (stainless)
- Thread size: 5/8-11
- Material: 18-8 stainless steel
- SKU/Item No.: 50-00631
- Package quantity: 10 per bag (as listed in Seachoice catalog for item 00631)
Parts Desk Insights
Best Use Case: Use on applications where vibration or movement can cause a standard nut to loosen, such as marine/boating hardware mounts and other secured threaded joints.
Common Issues: If the nut feels like it is not seating or engages inconsistently, verify the mating bolt/stud is truly 5/8-11 coarse and that the threads are clean. Also confirm the nylon insert is not damaged during installation.
Related Products & Accessories
- Fasteners & Mounting - Browse related marine fasteners and mounting hardware for paired nuts, bolts, washers, and locking accessories.
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.