Project Description

THDM Series

MT Connector System

Amphenol Fiber Systems International (AFSI) has announced the latest addition to its high density product portfolio. The THDM is a MIL-PRF-28876 derived mechanical transfer (MT) rugged fiber optic connector for military and aerospace applications.

THDM is modular, allowing multiple combinations of fiber types to be used in the same connector. The THDM connectors are available in 2, 4 and 8- MT configurations, which can supports 24 to 192 fiber channels using industry standard MT ferrules. The connector features M28876 or M38999 strain relief options.

The THDM connectors also feature a ratcheting coupling nut, as well as insert to insert bottoming to provide superior optical performance in high shock and high vibration applications. The connectors are sealed to IP68 standards to resist fluids and dust penetration. A variety of protective finishes are available to ensure durability over a wide range of environmental conditions. As with most AFSI products, they are available in stainless steel, brass or marine bronze.

Features & Benefits

  • 3 configurations: 2, 4 and 8 MT ferrules for up to 192 fiber channels
  • Ratcheting coupling nut for high vibration environments (derived from M28876)
  • IP 68 sealing
  • Removable and replaceable MT ferrules
  • Expanded beam capable
  • Environmental –
    – Operating temperature -54C to + 65C
    – 500 cycles mating durability
    – Vibration per MIL-STD-1344, method 2005
  • Available in cadmium and nickel plated aluminum, stainless steel, PTFE and black anodize
  • Performance:
    – IL: 0.5dB nominal MM
    – IL: 0.65dB nominal SM


  • Military and Aerospace
  • Shipboard
  • Oil & Gas


Description Measurement/Detail
Attenuation (Insertion Loss) 0.75db max per connection (1.5 total), TIA/EIA-455-171
Return Loss -65dB Max RL HD-Optyx APC, TIA/EIA-455-107
Mating Durability 500 Cycles, TIA/EIA-455-21
Vibration TIA/EIA-455-11, Test Conditions II and VI
Mechanical Shock TIA/EIA-455-14, Test Condition A
Thermal Shock -40C to +85C, TIA/EIA-455-3
Thermal Cycling -40C to 85C, TIA/EIA-455-3
Ozone Exposure Per MIL-STD-1344A
Humidity tia/eia-455-5, 10 cycles
Fluid Immersion TIA/EIA-455-11
Cable Retention 400 pounds, TIA/EIA-455-6
Impact EIA/TIA-455-2
Crush Resistance MIL-STD-1344, Method 2008.1, 7 tests @ 1250 Newton
Cable Sealing Flexing MIL-STD-1344, Method 2017
Corrosion Resistance 500 hour TIA/EIA-455-14 (CAD)
Connector, Backshells, and Dust Cover Aluminum alloy, cad plate, 316 stainless steel, 303 stainless steel
Cable Sealing Strain Relief Polyolefin, self-encapsulating