National Marker N221978 Hook Eye Turnbuckle 3/8x10.5 in

Product Description

The NATIONAL MARKER N221978 is a hook eye turnbuckle designed for tightening and drawing together lines, cables, and rigging assemblies. Built from stainless steel with an aluminum hex-shaped body, this turnbuckle delivers strong corrosion resistance in demanding environments. The hex body allows adjustment by hand or with a standard wrench, making field use straightforward. Eyes are passivated for superior corrosion resistance, and the assembly is nonmagnetic throughout. At 3/8 inches by 10.5 inches, it fits a range of tensioning applications across marine, structural, and outdoor installations. Licensed contractors and rigging professionals are the typical installers.

This turnbuckle is well suited for marine rigging, outdoor cable tensioning, and other applications where atmospheric corrosion resistance is a primary concern. The combination of stainless steel construction and passivated eyes makes it appropriate for saltwater-adjacent environments, fencing, signage support cables, and similar outdoor tensioning work. It ships as a single loose unit and is sold individually.

Key Features

• Stainless steel construction with aluminum hex body for corrosion resistance in outdoor and marine environments
• Passivated eyes provide superior resistance to atmospheric corrosion
• Nonmagnetic assembly suitable for installations requiring non-ferrous hardware
• Hex-shaped body allows adjustment by hand or with a wrench
• Hook and eye configuration for versatile line and cable connections
• 3/8 inch by 10.5 inch form factor for medium-duty tensioning applications

Compatibility

Designed as an OEM-style replacement and general-use tensioning component for 3/8 inch rigging, cable, and line applications in marine and outdoor environments. Referenced as National catalog model 2173BC.

Installation Notes

Installation is typically performed by rigging professionals, marine technicians, or contractors familiar with tensioning hardware. Before adjusting or replacing a turnbuckle in a loaded cable or rigging system, relieve tension from the line and secure all connected members. Use a wrench on the hex body to achieve final tensioning; avoid over-tightening beyond the rated load capacity of the connected cables. Follow applicable OSHA and local rigging codes when used in structural or load-bearing applications.

Technical Specifications

• Size: 3/8 inches x 10.5 inches
• Material: Stainless steel with aluminum body
• End Fittings: Hook and eye
• Body Shape: Hex
• Corrosion Treatment: Passivated eyes
• Magnetic Properties: Nonmagnetic
• Weight: 0.344 pounds
• UPC: 00038613191372

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N221978