US Patent 8702335 Module clamp and fastener apparatus

An apparatus and method of employing modified twist-to-engage bolts that attach a photovoltaic (PV) module to an extrusion rail or channel within a rail are disclosed. In addition to a modified twist-to-engage bolt (e.g., “t-bolt”), a complementary bracket portion having alignment tabs locks in place and clamps the modules to the rail. The anti-rotation locking system prevents twist-to-engage bolts from disengaging without the removal of the complementary bracket.