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PHONE HOTLINE: 800-346-4296 E-MAIL: sales@hayn.com
Contact Us
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NAVTEC BY HAYN

The NAVTEC K550 Micro Stemball Tang is a mast-mounted fitting designed to receive the F235 Micro Stemball at the upper rod terminal interface, available in two configurations to suit stainless steel or alloy mast construction across NAVTEC rod sizes from -06 through -60. 

NAVTEC by Hayn - Strong Where It Matters

NAVTEC K550 Micro Stemball Tangs

The Suffix 01 assembly includes a cap, cup washer, and stainless steel backing plate for standard mast applications, while the Suffix 02 assembly substitutes a clamp bushing and alloy backing plate for installations where an alloy mast wall requires a different mounting approach — with Suffix 02 backing plates supplied un-hardcoated and without mounting holes for custom fitting on site. Mast hole sizes run from 1.250" through 3.125" depending on rod size, with tang lengths from 2.81" through 7.50" and widths from 1.38" through 4.00" across the 11 standard rod size configurations. The K550 can also be ordered as part of the pre-matched K550/C651 Turnbuckle Combination for installations that integrate the tang directly with the tip turnbuckle assembly. 
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NAVTEC K550 micro stemball tangs
Hayn Part # 316SS BP NAVTEC # 316SS BP Hayn Part # Alloy BP NAVTEC Part # Alloy BP W-Rod Size Mast Hole Size 01 L-Length 01 F-Width 02 L-Length 02 F-Width
HYN-MSBT-06-01 K550-006-01 HYN-MSBT-06-02 K550-006-02 -6 1.250″ 2.81″ 1.38″ 2.88″ 1.63″
HYN-MSBT-08-01 K550-008-01 HYN-MSBT-08-02 K550-008-02 -08 1.250″ 2.81″ 1.38″ 2.88″ 1.63″
HYN-MSBT-10-01 K550-010-01 HYN-MSBT-10-02 K550-010-02 -10 1.375″ 3.32″ 1.50″ 3.38″ 1.63″
HYN-MSBT-12-01 K550-012-01 HYN-MSBT-12-02 K550-012-02 -12 1.375″ 3.32″ 1.50″ 3.38″ 1.63″
HYN-MSBT-15-01 K550-015-01 HYN-MSBT-15-02 K550-015-02 -15 1.375″ 3.32″ 1.50″ 3.38″ 1.63″
HYN-MSBT-17-01 K550-017-01 HYN-MSBT-17-02 K550-017-02 -17 1.875″ 4.59″ 2.00″ 4.50″ 2.25″
HYN-MSBT-22-01 K550-022-01 HYN-MSBT-22-02 K550-022-02 -22 1.875″ 4.59″ 2.00″ 4.50″ 2.25″
HYN-MSBT-30-01 K550-030-01 HYN-MSBT-30-02 K550-030-02 -30 2.188″ 5.12″ 2.38″ 5.13″ 2.50″
HYN-MSBT-40-01 K550-040-01 HYN-MSBT-40-02 K550-040-02 -40 2.500″ 5.73″ 2.73″ 5.75″ 3.00″
HYN-MSBT-48-01 K550-048-01 HYN-MSBT-48-02 K550-048-02 -48 3.00″ 6.37″ 3.28″ 6.38″ 3.50″
HYN-MSBT-60-01 K550-060-01 HYN-MSBT-60-02 K550-060-02 -60 3.125″ 7.22″ 3.41″ 7.50″ 4.00″

Suffix 01 assembly includes 1 cap, 1 cup washer, and 1 backing plate. Suffix 02 assembly includes 1 cap, 1 cup washer, 1 clamp bushing, and 1 alloy backing plate. Note: Suffix 02 backing plates are supplied un-hardcoated and without mounting holes.

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.
NAVTEC ENGINEERING STANDARDS NAVTEC components are engineered to perform under the exact conditions that demand the most from your rigging — offshore passages, high-load racing applications, and everything in between. Every fitting is precision-machined to tight tolerances, built from high-grade stainless steel, and designed to integrate seamlessly into rod rigging systems where failure is not an option. 
YOUR EXCLUSIVE SOURCE FOR NAVTEC Hayn is the sole authorized manufacturer and supplier of NAVTEC rigging components. That means every part you order is made to the original specifications, backed by Hayn's manufacturing expertise, and supported by our team in Rocky Hill. There is no other legitimate source for new NAVTEC product — what you get here is the real thing. 
  • 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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