About the EIA 1-5/8 Interface

EIA flange connectors are commonly used to connect two components in a high power coaxial transmission line. EIA stands for “Electronic Industries Alliance” which is a standards body that defines the interface configuration. Typically these are only required in very high power transmitting installations (10s of kW to MW) where the feedline diameters may be several inches. One side of the connection is denoted as a male connection, or bullet, while the other side is denoted as the female connection, or cup. The mounting flange design, inner and outer conductor dimensions are standardized by the EIA. They are commonly referred to by the outer diameter of the outer conductor in fractional inches. Sizes covered under these two standards range from 3/8 to 6 1/8 inch outside diameter (OD) for 50 ohm designs. Common flange sizes include 1-5/8 (3 GHz max frequency) and 7/8 (6 GHz max frequency). EIA flange designs are commonly used in military applications connecting high power antennas for ground or airborne radar as well as commercial applications in industrial equipment, broadcast and telecom infrastructure.


EIA 1-5/8technical diagram

click to enlarge



Nominal Impedence50 ohms
Frequency RangeDC to 3 GHz
Voltage Rating5100 volts rms
Dielectric Withstanding
10400 volts rms


Mating Characteristicsper EIA STD RS-225 and MIL-DTL-24044
Connector Durability500 cycles min.
Recommended TorqueN/A (Flange Mounting)


BodyBrass, Silver or Nickel Plated
Contacts (Inner)Male: Beryllium Copper, Silver or Gold Plated. Female: Brass, Silver or Gold Plated
Contacts (Outer)Brass, Silver or Nickel Plated
Contacts (Slotted)Beryllium Copper, Silver or Nickel Plated
Gaskets & SealsSilicone Rubber


Tempurature Range-85°F to +329°F (-65°C to +165°C)
VibrationMIL-STD-202 Method 204
ShockMIL-STD-202 Method 213
Moisture ResistanceMIL-STD-202 Method 106
Corrosion (salt spray)MIL-STD-202 Method 101

Download as Printable PDF