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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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Stemball and Open Body

The Hayn Stemball and Open Body turnbuckle pairs a forged bronze stemball with a chromed bronze open body to provide full angular articulation at the wire terminal end, eliminating side-loading at the most fatigue-prone point in a standing rigging assembly.

Strong Where It Matters

Stemball and Open Body

The stemball's spherical head seats into a compatible cup fitting at the chainplate or deck fitting, allowing the wire end to move freely through its working arc without bending stress concentrating at the terminal interface — the primary mechanism behind long-term fatigue failure in standing rigging. The chromed bronze open body provides direct visual access to thread engagement during tensioning and inspection, and the forged bronze construction prevents galling at the threaded interface. Available in four configurations covering wire diameters from 3/16" through 1/2", with thread sizes from 3/8-24 through 3/4-16 and open lengths from 8-3/4" through 16-3/8". 
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Stemball and Open Body

Stemball and Open Body

Part # Wire ⌀ Thread HD-Head Diameter RAD-Radius O-Open L C-Closed L L-Body Weight lbs.
38FBSB693 3/16″ – 1/4″ 3/8-24 0.693″ 0.346″ 8-3/4″ 7″ 5 1/2″ 0.38
12FBSB1000 1/4″ – 5/16″ 1/2-20 1″ 0.472″ 10-7/8″ 8-7/8″ 6-1/2″ 0.94
58FBSB1102 5/16″ – 3/8″ 5/8-18 1.102″ 0.551″ 1′-1 3/8″ 10-7/8″ 8″ 1.46
34FBSB1102 7/16″ – 1/2″ 3/4-16 1.102″ 0.551″ 1′-4 3/8″ 1′-1 3/8″ 10″ 2.90
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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