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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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Countersunk Termination Stud System

The Hayn Countersunk Termination Stud System is a Traditional Cable Rail end fitting that seats flush within the post face for a clean, hardware-free appearance, available as a turnbuckle assembly or fixed stop in machine swage, Hayn Grip, and Handy Crimp configurations. 

Strong Where It Matters

Countersunk Termination Stud System

Where a standard hex nut leaves a flat face and exposed thread stub at the post, the acorn nut's domed cap covers the thread end completely — a small detail that makes a visible difference on exterior decks, interior stair rails, and anywhere the termination hardware is viewed up close. Available in right hand thread only across four sizes covering 1/4-28, 5/16-24, 3/8-24, and 1/2-20, they are compatible with the full range of Hayn Concealed Thread and Traditional cable rail termination stud systems. For flat hex nut options in the same thread range, see the Hayn Hex Nut System. 
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Termination Stud Turnbuckle Assembly – Machine Swage

Part # Thread Wire Size Max. Post Size Adjustment Range Max. Run Length
14TTLL18CTS 1/4-28 1/8″ 2″ 3″ 50′
14TTLL18CTS4 1/4-28 1/8″ 4″ 3″ 50′
14TTLL18CTS6 1/4-28 1/8″ 6″ 3″ 50′
14TTLL532CTS 1/4-28 5/32″ 2″ 3″ 50′
14TTLL316CTS 1/4-28 3/16″ 2″ 3″ 50′
14TTLL316CTS4 1/4-28 3/16″ 4″ 3″ 50′
14TTLL316CTS6 1/4-28 3/16″ 6″ 3″ 50′

Termination Stud Turnbuckle Assembly – Hayn Grip™

Part # Thread Wire Size Max. Post Size Adjustment Range Max. Run Length
14TTHG18CTS1 1/4-28 1/8″ 1″ 3″ 50′
14TTHG18CTS 1/4-28 1/8″ 2″ 3″ 50′
14TTHG18CTS4 1/4-28 1/8″ 4″ 3″ 50′
14TTHG18CTS6 1/4-28 1/8″ 6″ 3″ 50′
14TTHG316CTS1 1/4-28 3/16″ 1″ 3″ 50′
14TTHG316CTS 1/4-28 3/16″ 2″ 3″ 50′
14TTHG316CTS4 1/4-28 3/16″ 4″ 3″ 50′

Termination Stud Turnbuckle Assembly – Handy Crimp™

Part # Thread Wire Size Max. Post Size Adjustment Range Max. Run Length
14TTCLL18CTS1 1/4-28 1/8″ 1″ 3″ 50′
14TTCLL18CTS 1/4-28 1/8″ 2″ 3″ 50′
14TTCLL18CTS4 1/4-28 1/8″ 4″ 3″ 50′
14TTCLL18CTS6 1/4-28 1/8″ 6″ 3″ 50′
14TTCLL316CTS1 1/4-28 3/16″ 1″ 3″ 50′
14TTCLL316CTS 1/4-28 3/16″ 2″ 3″ 50′
14TTCLL316CTS4 1/4-28 3/16″ 4″ 3″ 50′
14TTCLL316CTS6 1/4-28 3/16″ 6″ 3″ 50′

Termination Stud Fixed Stop – Machine Swage

Part # Wire Size Cap Size
CTSLL18 1/8″ 1/2″
CTSLL532 5/32″ 9/16″
CTSLL316 3/16″ 9/16″

Termination Stud Fixed Stop – Handy Crimp™

Part # Wire Size Cap Size
CTSCLL18 1/8″ 1/2″
CTSCLL316 3/16″ 9/16″

Countersunk Termination Stud System is available as a turnbuckle assembly or fixed stop for the Hayn Traditional Cable Rail System.

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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