Single Mode FC/APC Connectors


FC/APC Fiber Connectors: Single Mode

  • Screw-In Connectors
  • 8° Pre-Angled, Spring-Loaded, Ceramic Ferules
  • Typical 10 dB Improvement in Return Loss Compared to FC/PC Connectors
  • 2.0 mm Narrow Keys


  • FC/APC Connectors with 2.0 mm Narrow Keys
  • Screw-In Connector for High Stability
  • 8° Pre-Angled, Spring-Loaded, Ø2.5 mm, Ceramic Ferrules
  • Strain Relief Boot for Ø3.0 mm or Ø900 µm Tubing and Connector Cap Included

Threaded FC/APC connectors are designed for high-vibration environments and minimal back reflections. The "APC" stands for "angled physical contact" because these connectors allow the surfaces of two connected fibers to be in direct contact with each other and because the fiber end is polished at an angle to prevent reflected light from traveling back up the fiber. These FC/APC connectors have an 8° pre-angled ceramic ferrule, which when properly polished, results in a typical return loss of 60 dB.

These connectors also feature a low 0.25 dB connector-to-connector typical loss. However, significant insertion loss can result when mating to different styles, and because of this, we recommend that FC/APC connectors be mated only with other FC/APC connectors. If your application requires that you switch connector types, we recommend using a hybrid patch cable.

Each connector package includes a fiber connector cap and plastic boot. For temporary termination, our BFTU Bare Fiber Terminator can be used with the 30126A9 and 30126A3 connectors.


FC/APC Fiber Connectors: Single Mode

Item #StyleBoreConcentricityFerruleIncluded BootCrimp Tool for
Ø3.0 mm Tubinga
30080K1 2.0 mm FC/APC Narrow Key Ø81 +1/-0 µm 1 µm Ø2.5 mm, Ceramic Ø900 µm Not Required
30126A3 2.0 mm FC/APC Narrow Key Ø126 +1/-0 µm 1 µm Ø2.5 mm, Ceramic Ø3.0 mm CT042
30126A9 2.0 mm FC/APC Narrow Key Ø126 +1/-0 µm 1 µm Ø2.5 mm, Ceramic Ø900 µm Not Required
  • A crimp tool is not required for Ø900 µm boots. For more details, please see our FN96A Connectorization Guide.


Strain Relief Boots and Dust Caps


* Strain Relief Boots and Crimp Sleeves for Ø2 mm Tubing (25 Pack)
* CAPF Dust Cap for Ø2.5 mm Ferrules (25 Pack)
* CAPFM Threaded Metal Dust Cap for FC Connectors (4 Pack)

Thorlabs offers strain relief boots and dust caps that can be purchased separately from our fiber connectors. The black strain relief boots sold here are compatible with FC/PC and FC/APC connectors and Ø2 mm furcation tubing (our stock connectors do not include a boot compatible with Ø2 mm tubing).

The CAPF Clear Plastic Dust Caps are for use with all Ø2.5 mm fiber connector ferrules and FC connectors, and the CAPFM Threaded Nickel-Plated Brass Dust Caps are for use with narrow-key FC connectors. Dirt on the fiber tip can result in permanent damage to the fiber connector, which can increase coupling losses or create undesirable mode structures in the output light. To prevent damaging the connectorized fiber, clean it before each use and use a fiber connector cap to protect the end face of the connectorized fiber when it is not in use.


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