HMA-S Series connector

HMA-S Series connector

The OPTOKON HMA-S connector series, a large size „Expanded Beam“ connector is designed for connection of the nodes of harsh environmental network by the help of cables with optical fibers. The used expanded beam technology preservers all advantages of signals transmission through the optical lines in field harsh environmental conditions. Additionally to ruggedized optical networks the HMA-S is suited for a vast array of applications, like heavy industry connections, petrochemical application, broadcasting temporary optical lines. The innovative designs ensure its ability for deployment in the toughest environments where high performance and total reliability are critical.  Benefiting from expanded beam technology the precision optical alignment system creates immunity from water, mud, dust oil and other contaminants. The HMA-S Hermaphroditic coupling eliminates the need for adaptors and male and female mating halves. Hermaphroditic housings allow for rapid deployment, creating low loss Single mode and Multimode daisy chained links in a variety of planforms ranging from simplex fiber to a four fibers. The OPTOKON HMA-S is ideally suited for environmental extremities where low maintenance and quick repairability is necessary.

  • Advanced expanded beam technology
  • Hermaphroditic interconnection
  • 1 to 8 fiber channels Single mode or Multimode
  • Low insertion loss / high return loss
  • Hybrid electrical & fiber channel options available
  • Rugged field repairable connector design

Insertion Loss

50/125 @ 850/1300 nm:  1 to 4 channels: 1.0 dB max; 6 & 8 channels: 1.5 dB max
9/125 @ 1310/1550 nm:  1 to 4 channels: 1.5 dB max; 6 & 8 channels: 2.0 dB max

Return Loss

9/125 @ 1310/1550 nm > 32 dB (typ. 40 dB), >20 dB multimode

Electrical power contacts

Size 20 & size 16 MIL-C-39029. Contact resistance <4 mΩ. Operating voltage 1000 VAC.
Operating current 5 A (short term 15 A)

Electrical: Test Voltage

Between contacts and contact / housing: 3000V / 50Hz, 1 minute EN61984


3000 Matings minimum

Operating temperature

-40 to +85 °C

Storage temperature

-55 to +85 °C

Water immersion

up to 15 m depth

Vibration Sinusoidal

10-500 Hz, 0.75 mm amplitude @ 10 g acceleration

Free fall resistance

500 falls from 1.2 m height

Bump resistance

4000 bumps @ 40 g acceleration

Tensile Strength

Tensile of 1500 N, cable dependent

Crush resistance

6.7 kN

Corrosion resistance

500 Hours Salt Spray

Cable retention

1500 N (cable dependant)

Cable Variations

Compatible with tactical cable: Plug < 6 mm o/d , Bulkhead < 3 mm o/d
Other cable sizes available on request


black anodized, green RAL 60141

Technical drawings:

Plug Connector

Bulkhead Jam-Nut

Bulkhead Flange


Optical insert arrangement:     





Bulkhead Jam-Nut

Hybrid insert arrangement:
2 POWER (#16)
2 SIGNAL (#20)
2 POWER (#16)
2 SIGNAL (#20)
2 POWER (#16)
  • Broadcast

  • Harsh environmental communications

  • Industrial

  • Petrochemical


  • Best optical performance available

  • No adaptors necessary

  • Combined fiber and electrical channels

  • Inexpensive, low downtime field repair

  • Easy clean, no special tools


  • Anodized high grade lightweight alloy

  • Neoprene BR568 Grip ring






 X(SM, M5, M6) - Y(D,P)
















fiber number





contact number


bulkhead jam nut



data, size 20


bulkhead flange



power, size 16


bulkhead low profile




Typical configuration:
HMA-S – 6SM    HMA plug connector, 6 SM fiber channels
HMA-S – 4SM-2P    HMA plug connector, 4 SM fiber channels, 2 electrical power contacts