A static loading test program was conducted on auger cast piles in the Texas Gulf Coast Region to evaluate their bearing capacity in expansive soils. The tested piles, with a diameter of 24 inches, were installed to depths of 60 and 85 feet below the existing ground surface. The design loads for the piles were 93.5 tons and 207 tons for the 60-foot and 85-foot depths, respectively. Fifteen days after pile construction, static loading tests were performed, with maximum test loads ranging from 2 to 4 times the design loads. Analysis of the test results, correlated with the undrained shear strength of the expansive soils, suggests an α coefficient of approximately 0.38 for the auger cast pile shaft re-sistances in expansive soil., which is about 1.5 to 1.8 times less than the α coefficient for conventionally drilled shafts.