Abstract: An equipment mounting apparatus includes a base formed from a cast aggregate material. Parallel steel U-shaped channels are cast in the base, with the sides of the channels rolled over at their top edges to provide downwardly facing longitudinally parallel rails. Cleats are formed on the bottom of the channels to fixedly secure the channels in the aggregate base. A spring biased fastener assembly is positioned in the channel with a threaded aperture opening upwardly to receive a bolt connected to equipment to be mounted on the base. The upper surface of the fastener assembly has parallel channels formed therein which are arranged to matingly receive the parallel edges of the rails formed by the rolled over channel sides. Projections are formed in the upwardly facing bottom surface of the fastener assembly channels to frictionally grip the rail edge and prevents slippage between the fastener assembly and the U-shaped channels.