Federal supply schedule, FSC group. 53. Hardware and abrasives, pt. 1 (formerly class 42. pt. 1) FSC class 5335 Metal screening, FSC Class 5340, Miscellaneous hardware, FSC class 5350, Abrasive materials, GSA region 3, District of Columbia, and Maryland, Virginia, and West Virginia, Oct. 1, 1957-Sept. 30, 1958.