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Item #:
209688624
5/16-18 (50 Pack) Stainless Steel Hex Locknuts, Nylon Insert Hexagon Lock Nuts US Standard, Stainless Steel 304 (18-8), UNC Coarse Thread, Black
Item #:
209688624
GMD 740
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
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In stock
Imported from USA store
QTY:
Order now and get it around Sunday, August 23
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The nylon collar provides consistent locking torque and can be reused several times without significant loss of performance.
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Durable Material
Crafted from stainless steel 304, these locknuts offer exceptional corrosion resistance, ensuring long-lasting performance even in challenging environments.
Secure Locking
Featuring a nylon insert, these hex locknuts provide a firm grip that prevents loosening, making them ideal for high-vibration applications, ensuring safety and reliability.
Versatile Compatibility
Designed with UNC coarse threads, these locknuts are perfect for a wide range of projects, ensuring easy integration with various hardware for versatile use.
Product Details
Who Should Buy?
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DIY Enthusiasts
Perfect for DIY projects, providing reliable locking for various applications requiring durable fastening solutions.
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Outdoor Applications
Ideal for outdoor settings where corrosion resistance is needed for long-lasting performance against environmental factors.
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Automotive Use
Great choice for automotive repairs, offering secure fastening even in high-vibration environments with its locknut design.
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Heavy Machinery
Not suitable for heavy machinery applications that require higher load-bearing specifications than what locknuts can offer.
Product Description
5/16-18 (50 Pack) Stainless Steel Hex Locknuts, Nylon Insert Hexagon Lock Nuts US Standard, Stainless Steel 304 (18-8), UNC Coarse Thread, Black Coated
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Customer Questions & Answers
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Question:
Can these lock nuts be used in wet environments?
Answer: Yes, the 18-8 stainless steel provides excellent rust and corrosion resistance, making them ideal for fresh and saltwater applications. -
Question:
How many times can I reuse the nylon insert lock nuts?
Answer: The nylon collar can be reused several times without significant loss of performance, making them convenient and economical. -
Question:
What size bolts are compatible with these lock nuts?
Answer: These lock nuts are designed for use with 5/16”-18 size bolts; using the correct size is crucial to avoid damage.
RoyceMart Locknuts Editorial Review
The 516-18 50 Pack Stainless Steel Hex Locknuts with a Nylon Insert has emerged as a favored choice among users who prioritize both functionality and appearance in their hardware purchases. Customers have expressed satisfaction with the aesthetic appeal of these locknuts, particularly appreciating the shiny black coating that complements the overall look of installed equipment. This makes them ideal for projects where visual presentation is a Consideration, as noted in a review where they were installed in a basement environment. Functionally, the locknuts have received high marks for their performance. Users report that the locking mechanism is effective, ensuring that screws remain securely fastened under various conditions, including environments subject to significant vibration, as experienced with RZR installations. The quality of the coating has also been highlighted, with many reviewers noting its durability against wear and abrasions typically found in high-movement contexts. Overall, customers seem to be pleased with the combination of visual appeal, reliable performance, and secure fastening features, making the 516-18 locknuts a solid investment for DIY enthusiasts and professionals alike. **
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Pros
- Aesthetically pleasing black coated finish
- Effective locking mechanism prevents loosening
- Durable finish that withstands tightening without wear
- Suitable for use in environments with vibration and movement
Cons
- Paint may not resist high abrasion over prolonged use
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
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“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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kund
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“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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Onesi
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“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
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“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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GMD 740
Order now and get it around Sunday, August 23
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
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Features & Benefits
- Durable nylon insert prevents loosening under vibration.
- Made from corrosion-resistant 18-8 stainless steel.
- Ideal for both indoor and outdoor applications.
- Pack of 50 nuts ensures you have enough for multiple projects.
- Reusable design offers economic advantages over single-use alternatives.
- Compatible with various bolts for general fastening tasks.
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