Lifetime Connectivity

318EIA-HCA300-019
3-1/8" EIA Connector for 3" Coaxial Cable, Gas stop/ Gas pass,O-Ring Sealing

Rev : A | Rev date : 15 Nov 2025

Radio Frequency Systems line of high-performance HELIFLEX® coaxial cable connectors are characterized by excellent gas tightness and extremely low losses. HELIFLEX® connectors can be installed with basic hand tools. Tab flange of outer connection and use of o-ring sealing simplifies installation of the connector.
RFS connectors are fully tested for mechanical and electrical compliance to specifications.
HELIFLEX® connectors have excellent electrical values and provide outstanding performance for the most demanding applications. The RFS connector design provides maximum sealing integrity and gas tightness.

Feature / Benefits

  • Easy installation utilizing only basic hand tools.
  • Tab flare of outer contact attachment means quick and simple installation.
  • No need for sealing compound. The connector is ready for pressurization immediately after installed to the cable.
  • Excellent gas tightness. Overpressure for increased voltage handling is maintained throughout the system.
  • Outstanding VSWR performance improves overall system performance.
  • Totally waterproof, assures safe, long term operation in the harshest of environments. 
  • RoHS (EU) and CRoHS (China) compliant, can be used on a global basis.
318eia-hca300-019_image_datasheet.jpg
General Specifications
Cable Size 3"
Cable Type Air Dielectric
Model Series HCA300-50 Series
Connector Interface 3-1/8" EIA
Connector Type
Gas stop /Gas pass - See Note 1)
Sealing Method
O-ring seal
Mechanical Specifications
Plating Outer/Inner Tri Plate/Silver
Length 164mm (6.45in)
Outer Diameter 136mm (5.35in)
Outer Contact Attachment Tab Flare
Electrical Specifications
Frequency Range VSWR value Return Loss value
0 <f ≤ 860 MHz 1.02 40
860 MHz <f ≤ 1.5 GHz 1.05 32

External Document Links

Notes

1) The connector is converted to gas pass by drilling through the pilot hole in the insulator.
2) Connector does not include an inner connector.

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