K2 Systems Rail Connector CR 44-X Mill 4000051-US

The K2 Systems 4000051-US is a mill-finish structural rail connector for CR 44-X CrossRail systems. Designed to provide a strong, bonded link between two rail segments, it supports structural continuity and electrical grounding when paired with appropriate bonding hardware. This connector ensures fast, secure alignment and assembly in residential and commercial solar arrays.

Key Benefits

Structural Integrity: Provides a mechanically robust rail joint for long-span or multi-rail configurations.

Bonding Compatible: Supports grounding continuity when installed with bonding T-bolts (required for dark rails).

Quick Assembly: Slides easily into place with integrated mating features for fast alignment.

Secure Locking: Uses dual M10 T-bolts and serrated hex nuts torqued to 25.8 ft-lbs for secure attachment.

Special Technology

Mating Feature Design: Ensures proper positioning and engagement within the rail channel.

Pre-Installation Slot Alignment: Slot guides help installers verify proper T-bolt seating for fast and safe installation.

Warranty

Backed by K2 Systems’ standard product warranty when installed per system guidelines.

Best Uses

CrossRail 44-X Systems: Used for extending or structurally joining two CR 44-X rails.

Residential & Commercial PV: Ensures mechanical and bonding continuity in flush or tilted installations.

Specifications Table

About K2 Systems:

K2 Systems is a German-based solar mounting specialist known for its high-quality, durable racking and mounting solutions used worldwide. Their product portfolio includes rail‑based and rail‑less systems—such as the Ground and SolarRoof lines—for pitched, flat and commercial PV installations. K2’s designs are highly customizable, approved for varied roof materials, and engineered for efficient assembly, optimal wind load performance, and robust lifespan.

Why Buy From US Solar Supplier?

As an American founded company out of Kentucky, US Solar Supplier is committed to providing top-quality solar products, backed by the world’s leading manufacturers. Our promise is to get you the fairest price from the best brands that offer warranties you can count on. We are updating our inventory daily with solar components that offer the latest technology. With a reputation for excellence and a dedication to customer satisfaction, we ensure that every product we sell meets the highest standards in the industry.

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