Solar Mid Clamp with U Bolt

Product Description:

Solar Mid Clamp with U Bolt: Fixing PV Modules to U-Steel and Square Tube Purlins

Last monsoon season, an EPC crew retrofitting a 3 MW ground-mount plant near Da Nang, Vietnam found something that keeps repeating itself across coastal Asia: on arrays built from square tube and C-steel purlins, the standard rail-style mid clamps had worked loose where the rail bolted to the beam, and the modules had started to shift and chatter in every storm. The purlins were fine. The frames were fine. The failure was in the connection between them.

The fix is a different category of part entirely — a solar mid clamp with U bolt. Instead of gripping the frames down onto a separate rail, the clamp body presses the two adjacent module frames while a hot-dip galvanized U bolt wraps directly around the U-steel or square tube purlin beneath them, locking module and purlin into one structural assembly. SolarPartsComponents (SPC) builds this clamp in anodized AL6005-T5 aluminium with Q235B hot-dip galvanized U bolts (SUS304 available for coastal sites), rated for 60 m/s wind load and 1.4 kN/m² snow load, engineered to AS/NZS 1170, DIN 1055, GB50009-2012, IBC 2009 / CBC 2010 and JIS C 8955:2011, and backed by a 10-year warranty on a 25-year designed lifespan.

Key Characteristics and Application Scope

The solar mid clamp with U bolt is at home wherever framed modules sit directly on bare steel sections:

Square tube ground mounts. Galvanized or ZAM square tube racking is the most common ground-mount structure in Southeast Asia and India. The U bolt wraps the tube, the clamp locks the frames — the product’s core use case, pairing naturally with TBS solar ground mounting systems and our ground racks designed for flat terrain.

C-channel (U-steel) purlins. On industrial roofs where C-purlins are exposed, the U bolt grips the purlin web and flanges without penetrating the roof sheet. For the C-steel-section variant, see our C-steel solar panel mid clamp.

Solar carports and sheds. Carport and shed structures use the same square tube beams, so one clamp type shortens the bill of materials across ground and canopy projects.

Corrosion pairing done properly. The anodized aluminium body touches the module frame; the hot-dip galvanized U bolt touches the steel purlin. Each metal pair is matched to the surface it actually contacts.

Retrofit and repair. Where an older array’s rail connection has loosened, the kit converts it to a direct frame-to-purlin connection without replacing the structure.

Closing: The Solar Mid Clamp with U Bolt Belongs in Every Steel-Purlin Bill of Materials

A solar mid clamp with U bolt does one job no rail clamp or beam clamp can do: it fixes framed PV modules directly to U-steel and square tube purlins, wrapping the steel section in a hot-dip galvanized U bolt while the anodized AL6005-T5 clamp body presses the frames — no drilling, no welding, no rail, and no loose intermediate joint for the wind to find. The inferior alternative — drilling the purlin or welding brackets on site — breaks the coating exactly where corrosion starts and costs crew hours on every row. If your next ground mount, carport or C-purlin industrial roof sits framed modules on bare steel, send SPC the purlin drawing and get the clamp matched before the steel leaves the mill