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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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Stemball Cup Washers

Hayn Stemball Cup Washers are Type 316 stainless steel bearing washers that seat between a stemball head and its receiving cup fitting, reducing wear at the contact surface and extending the service life of the stemball assembly. 

Strong Where It Matters

Stemball Cup Washers

The cup washer distributes the load contact between the stemball head and the cup more evenly than a direct metal-to-metal interface, reducing the fretting and wear that accumulates at this point over the life of the rig. Available in eight sizes with hole diameters from 0.35" through 0.79" and outside diameters of either 1.02" or 1.34", covering the full range of Hayn stemball head sizes used across the marine rigging and NAVTEC rod rigging product lines. Selecting the correct washer requires matching the hole diameter to the wire or rod size of the stemball being used. 
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Stemball Cup Washers

Stemball Cup Washers

Part # D-Hole ⌀ OD-Outside ⌀ Weight lbs.
SBC18 0.35″ 1.02″ 0.02
SBC532 0.35″ 1.02″ 0.02
SBC316 0.43″ 1.02″ 0.02
SBC732 0.52″ 1.02″ 0.02
SBC14 0.64″ 1.02″ 0.02
SBC932 0.64″ 1.02″ 0.02
SBC516 0.79″ 1.34″ 0.03
SBC38 0.79″ 1.34″ 0.03
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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