Expanded Beam Contacts Size 5 and 12

Smiths Interconnect
Part Number Information
Part #: Price/Availability:
239433-8000 Inquire
239333-8000 Inquire
23640Y-3000 Inquire
23640Y-2000 Inquire
238633-8000 Inquire
238733-8000 Inquire

Expanded Beam Fiber Optic Contact technology is specifically designed to fit into standard size 12 cavities of MIL-DTL-38999 Series I, III and IV connectors. The size 12 contact provides a robust fiber optic interconnection with low susceptibility to contamination and fits a variety of cable types with diameters from 1.6 to 2.2 mm with additional versions available upon request. The contacts are rear release/rear removable with standard size 12 removal tool. 

Size 12 Features

Fits standard size 12 contact cavities for MIL-DTL-38999 (dimensionally identical to size 12 electrical contacts per M39029/56-353 and M39029/58-365) \
Multimode applications 50/125 and 62.5/125
Insertion loss: 1.0 dB (Typical)

Size 5 Features

Multimode applications 62.5/125
Available for ARINC or MIL-DTL-38999 applications
Insertion loss: -0.8 dB (typical)


  • Multimode applications 50/125 and 62.5/125
  • Insertion loss: 1.0 dB (Typical)
  • Increased protection for fiber face
  • Reduced influence from dirt debris and vibration
  • Simple cleaning


  • Commercial aviation
  • Defense
  • Medical
  • Oil & Gas
  • Space