UFO® & Stopper Sleeves

The Universal Fastening Object

The UFO® is the only universal, single-piece fastener that quickly and securely bonds solar modules to XR Rails®. It comes lubricated and assembled, with a sleek, low-profile design. Simply snapping on a Stopper Sleeve transforms the UFO® into an end clamp.

The UFO® is a part of the IronRidge® Integrated Grounding System, which is listed to UL 2703 and eliminates the need for separate grounding hardware. Comes in black and mill finish.


UFO® hardware forms secure electrical bonds with both the module and the rail, resulting in many parallel grounding paths throughout the system. This leads to safer and more reliable installations.


The Stopper Sleeve snaps onto the UFO®, converting it into a bonded end clamp. Stopper Sleeves available in sizes: 30mm, 32mm, 33mm, 35mm, 38mm, 40mm, and 46mm.


UFO & Stopper Sleeve Documentation

UL2703 Certification


All IronRidge® Systems have been listed to UL 2703, the standard for evaluating solar mounting systems. This ensures they maintain strong electrical and mechanical connections over an extended period of time in extreme outdoor environments.

25-Year Warranty

25-YR Warranty

IronRidge® products come with a 25-year warranty, guaranteeing they will be free of defects in materials and manufacturing which materially impair the use of the products for the purposes for which they were designed.

Products Patents