FED-STD-H28/4, FEDERAL STANDARD: SCREW THREAD STANDARDS FOR FEDERAL SERVICES, SECTION 4, CONTROLLED RADIUS ROOT SCREW THREADS, UNJ SYMBOL (31 MAR 1978

FED-STD-H28/4, FEDERAL STANDARD: SCREW THREAD STANDARDS FOR FEDERAL SERVICES, SECTION 4, CONTROLLED RADIUS ROOT SCREW THREADS, UNJ SYMBOL (31 MAR 1978)., This Federal Standard is in general agreement with the latest issue in effect of MIL-S-8879 Screw Threads, Controlled Radius Root with Minor Diameter; General Specification for, and is therefore authorized for the use of all Federal Agencies.