D4 Connector

The D4 connector is an older generation single mode fiber optic connector with threaded nickel-plated brass body and 2.0mm precision zirconia ferrule.
This connector is available with a Physical Contact (PC) pre-dome ferrule endface as well as with an Angled Physical (APC) ferrule endface. We offer a crimp free and a crimp style version D4 connector, with various boot types and colors.



  • Low insertion loss & back reflection 
  • Spring loaded 2.0 mm precision zirconia ferrule
  • Custom ID ferrules 125um~680um
  • High durability and reliability
  • Corrosion resistant keyed body


  • Telecom networks
  • Wide area networks 
  • Local area networks

D4 Connector Specifications

SpecificationsSingle Mode
Insertion Loss SM (typical)
Return loss SM

>45dB PC
>60dB APC
Mating Durability (1000 matings)
Temperature Range
-40ºC to +75 ºC