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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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Hex Lock Nuts – Nylon Insert

Hayn Hex Lock Nuts with Nylon Insert are 18-8 stainless steel prevailing torque nuts for Concealed Thread and Traditional Cable Rail systems, providing vibration-resistant locking at the termination stud without requiring a secondary locking fastener. 

Strong Where It Matters

Hex Lock Nuts – Nylon Insert

The nylon insert grips the stud thread under load to prevent the nut from backing off over time — an important feature on cable rail installations that experience thermal expansion and contraction cycles as the structure moves seasonally. Available in right hand thread only across four sizes: 1/4-28, 5/16-24, 3/8-24, and 1/4-20 UNC, covering the thread range used across both Concealed Thread and Traditional cable rail termination hardware. For flush domed or standard hex nut options in the same thread range, see the other Hayn Hex Nut System products. 
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Hex Lock Nuts – Nylon Insert

Part # Thread Size Hand
14LNF 1/4-28 RH
516LNF 5/16-24 RH
38LNF 3/8-24 RH
14LNC 1/4-20 UNC RH

Hex lock nuts are 18-8 grade stainless steel and available in right hand thread only.

Engineered In America Every Hayn fitting is designed and manufactured at our facility in Rocky Hill, Connecticut — the same American workmanship that has set the standard for stainless steel rigging hardware since 1950.
Cold-Worked Production Hayn fittings are cold-worked, not cast. That distinction matters: the cold-working process refines grain structure, increases fatigue resistance, and produces a fundamentally stronger component — one built to perform when the load comes on it.
Precision Manufacturing Our Rocky Hill production floor runs CNC vertical mills, CNC lathes, large-capacity mill-turn centers, and waterjet cutting systems — all configured to produce hardware that meets exact specifications, every time.
75+ Years of Excellence Hayn has been engineering and manufacturing marine and architectural rigging hardware since 1950. That track record isn't just history, it's the design knowledge, failure data, and continuous improvement that goes into every product we make. 
  • Type 316 stainless steel construction for superior saltwater corrosion resistance
  • Manufactured in Rocky Hill, Connecticut to Hayn's proprietary tolerances
  • Precision-machined using advanced CNC manufacturing equipment



  • Engineered for seamless integration in marine and architectural rigging systems

  • Short lead times on both standard and custom components

  • Backed by 75 years of marine and architectural hardware expertise

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Let's Build Something Together

 Hayn has been engineering precision rigging hardware since 1950. So whatever your project demands, you're building with hardware that's been proven at sea and on structure for generations. 
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