ST Fiber Optic Connector Dimension Diagram

ST fiber optic connectors use a 2. 5 mm ferrule with crimp options ranging from 1. 6 mm to 3.

0 mm and feature a twist-lock bayonet coupling.

Ferrule and Bore

The ferrule diameter of an ST connector is 2. 5 mm, typically made of ceramic, with a bore tolerance of 0 to +4 µm to ensure precise fiber alignment and low insertion loss (0. 12–0.

3 dB depending on singlemode or multimode) (Panduit, Optoplast, Leviton). The ferrule is keyed to prevent rotation and is designed to provide mechanical isolation of the fiber. Crimp and Boot DimensionsST connectors accommodate fiber jackets of 1.

6 mm, 2. 0 mm, 2. 5 mm, and 3.

0 mm for crimp-style connectors, while 900 µm buffered fibers are supported without crimping (Optoplast, Leviton). The connector boot typically ranges from 2–3 mm for jacketed fibers and 900 µm for buffered fibers, providing strain relief and protection. Mechanical FeaturesST connectors use a twist-lock bayonet coupling for secure mating and easy installation (CoreTECH, Optoplast).

The connector housing may be metal or plastic, depending on the application, and the ferrule is pre-radiused for consistent optical performance. The overall connector length is generally cylindrical and long enough to allow floating ferrule movement, which reduces mechanical stress on the fiber.

Summary of Key Dimensions

Ferrule diameter: 2. 5 mmFerrule bore tolerance: 0 to +4 µmCrimp sizes: 1. 6 mm, 2.

0 mm, 2. 5 mm, 3. 0 mmBoot sizes: 900 µm (buffered), 2–3 mm (jacketed)Coupling type: Twist-lock bayonetFiber types supported: Singlemode (9/125 µm) and multimode (50/125 µm, 62.

5/125 µm) These dimensions ensure compatibility with standard ST adapters, patch panels, and fiber optic cabling systems while maintaining low insertion loss and high return loss for reliable data transmission.