Rosenberger SMP RF Coaxial Adapters. A range of 50 OHM SMP jack to jack RF coaxial connector adapters. These 50 OHM SMP RF coaxial adapters have a mating interface according to MIL-STD-348A and are available in different lengths: 6.45mm (stock number ; 819-4239 819-4239 ), 8.6mm (stock number ; 819-4248 819-4248 ), 11.4mm (stock number ; 819-4241 819-4241 ) and 16.74mm (stock number ; 819-4245 819-4245 )