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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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Hayn Threaded Stemballs

Hayn Threaded Stemballs are Type 316 stainless steel ball-head turnbuckle ends that thread directly into a turnbuckle body and seat into a compatible cup fitting, providing angular articulation at the turnbuckle connection point across eight standard configurations from 1/4-28 through 3/4-16 thread.

Strong Where It Matters

Threaded Stemballs

The stemball's spherical head distributes load across the cup seat rather than locking the fitting into a fixed geometry, which reduces bending stress concentration at the turnbuckle end interface as the rig moves under load. Two head diameter options are available on the 3/4-16 thread size — 1.102" and 1.338" — to match the specific cup geometry of the receiving fitting, and all eight configurations are left hand thread only for correct engagement with the gate end of standard Hayn turnbuckle bodies. Overall lengths run from 3-1/2" through 8-1/8" depending on thread size, with compatible cup washers available separately to reduce wear at the ball-to-cup contact surface. 
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threaded stemballs

Threaded Stemballs

Part # Thread HD-Head Diameter RAD-Radius T-Thread Length L-Length Weight lbs.
SBT14LHX0.590 1/4-28 0.590″ 0.046″ 2 1/4″ 3 1/2″ 0.06
SBT516LHX0.590 5/16-24 0.590″ 0.046″ 2 3/8″ 3 5/8″ 0.08
SBT38LHX0.693 3/8-24 0.693″ 0.436″ 2 7/8″ 4 1/8″ 0.12
SBT716LHX1.000 7/16-20 1.0″ 0.472″ 2 3/4″ 5″ 0.27
SBT12LHX1.000 1/2-20 1.0″ 0.472″ 3 1/4″ 5 1/2″ 0.33
SBT58LHX1.102 5/8-18 1.102″ 0.551″ 4″ 6 3/4″ 0.59
SBT34LHX1.102 3/4-16 1.102″ 0.551″ 5″ 8 1/8″ 0.97
SBT34LHX1.338 3/4-16 1.338″ 0.669″ 5″ 8 1/8″ 1.04
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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