Attend a 4 Day - Fiber Optics 1-2-3 Light Brigade Training Course held at Fiber Optic Center in New Bedford, MA. Upcoming class dates December 16-19, 2025. View More Details.

Fiber Optic Center will be at Photonics West - and BICSI Winter.
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    D4 Connectors

    The D4 Connector is an older generation single-mode fiber optic connector that is spring loaded and keyed with a 2.0mm precision zirconia ferrule... Read More
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    Strain Relief Boot

    D4 Connectors

    The D4 Connector is an older generation single-mode fiber optic connector that is spring loaded and keyed with a 2.0mm precision zirconia ferrule. The screw-on mechanism is a threaded nickel-plated brass body. The key prevents opposing ferrules from touching while mating. D4 Connectors are available with a APC (Angled Physical) ferrule endface or a PC (Physical Contact) pre-dome ferrule endface. There is also a crimp free or crimp style version. Applications for the D4 Connector include telecom networks, WANs (Wide area networks), and LANs (Local area networks).
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