Using a threaded interface, SMA 50 Ohm connectors are semi-precision units that provide excellent electrical performance from DC to 26.5 GHz and outstanding mechanical durability. SMA connectors feature stainless steel or brass construction and ¼ - 36 threaded coupling, which offers high performance in a compact design.

For phase array radar, test equipment, ILS landing systems and other instrumentation using phase matching techniques, SMA interconnects offer a precise and simple means of phase adjustment for microwave devices. Built in accordance with MIL-C-39012 and CECC 22110/111, SMA connectors can be mated with all connectors that meet these specification mating diameters regardless of manufacturer.

Related Products

SMA Adapters
SMA Accessories
SMA Cable Assemblies

Features and Benefits

  • Light weight, compact and vibration proof design
  • Low cost commercial grade (Brass SMA) available in nickel or gold plating 
  • Terminates to all standard flexible coaxial cables, low-loss (LMR) type cables and industry standard semi-rigid and conformable cables


  • Base stations
  • Antennas
  • Telecommunications
  • Instrumentation
  • PC/LAN

SMA Specifications

Impedance 50 Ohm
Frequency Range  
.141" & .085" O.D. Copper Jacket Semi-Rigid Cable 0-18 GHz
Flexible Cables 0-12.4 GHz
Voltage Rating   
RG-55, 58, 141, 142, 223, 303 500 volts peak
RG-122, 174, 188, 316 375 volts peak
Dielectric Withstanding Voltage (max.)  
.141" & RG-58 Group 1000 VRMS
.085" & RG-316 Group 750 VRMS
VSWR for M39012 Straight Connectors  
.141" O.D. Copper Jacket Cable 1.05 + .005 f (GHz)
RG-55 Group 1.15 + .011 f (GHz)
RG-122 Group 1.15 + .02 f (GHz)
RG-178 Group 1.20 + .025 f (GHz)
VSWR for M39012 Angle Connectors  
.141" O.D. Copper Jacket Cable 1.10 + .01 f (GHz)
RG-55 Group 1.15 + .02 f (GHz)
RG-122 Group 1.15 + .03 f (GHz)
RG-178 Group 1.20 + .03 f (GHz)
Insulation Resistance 5000 MΩ 
Contact Resistance  
  Center Conductor 2.0 mΩ
  Body 2.0 mΩ
  Braid to Body 0.5 mΩ
RF Leakage -60 dB min
Insertion Loss .03 sqrt(f(GHz)) dB max
Temperature Range -65⁰C to +165⁰C
Thermal Shock MIL-STD-202 Method 107 (test cond. B) except at high temp test @ + 200⁰C
Corrosion MIL-STD-202 Method 101 (test cond. B) 5% salt solution
Vibration MIL-STD-202 Method 204 (test cond. D)
Shock MIL-STD-202 Method 213 (test cond. I) No Discontinuity Permitted
Moisture Resistance MIL-STD-202 Method 106, except step 7b (vibration) omitted, and high humidity measurements do not apply 
Crimp Type heat shrink tubing
Solder Type Silicone rubber gaskets
Altitude MIL-STD-202 Method 105 (test cond. C), no corona at 70,000 ft
.141" & RG-55 Group 250 WRMS
.085" & RG-122 Group 190 VRMS
Contact Captivation All types, except as noted
Connector Durability 500 mating and unmating cycles @ 12 cycles/min
Cable Retention  
RG-58, .141, 303 Crimp type, 60 lbs min
RG-55, 142, 223 80 lbs min, 400
Connector Affixment to Cable Crimp types, solder types
Connector Affixment to Center Contact Solder, except as noted
Mating .250-36 threaded coupling
Mating Torque  
Minimum 2" lb, 22
Recommended (Industrial/Military Grade Parts) 7-10" Ib, 80-110
Recommended (Commercial Grade Parts) 4-6"lb, 45-67
Maximum (Industrial/Military Grade only) 15" lb,
Coupling Nut Retention  
Axial Force 60lbs. Min., 113N-cm
Torque 15" lb min. 170N-cm
Jacks N/A

Reverse Polarity SMA Specifications

Impedance 50 Ohm
Frequency Range  
  Semi-Rigid 0-18 GHz
  Flexible Cables 0-12.4 GHz
Straight Connectors: .141" S/R 1.05 + .005 f (GHz)
Straight Connectors: RG-174 1.20 + .025 f (GHz)
Dielectric Withstanding Voltage 1000 VRMS
Insertion Loss .03 sqrt(f(GHz)) dB max
Insulation Resistance 5000 M
RF Leakage -60 dB min
Voltage Rating 375 volts peak
Temperature Range -65⁰C to +165⁰C
Moisture Resistant Mil-STD-202, Method 106 (test cond. B)
Corrosion Mil-STD-202, Method 101, Condition B
Vibration Mil-STD-202, Method 204, Condition B
Mating .250-36 threaded coupling
Cable Affixment Crimp or solder types
Center Conductor Solder
Cable Retention 60- 80 lb, depending on cable
These characteristics are typical and may not apply to all connectors.

Interface Dimensions