ST Fiber Optic Connectors

The ST Fiber Optic Connectors from Amphenol Military & Aerospace, manufactured by Amphenol Fiber Systems International (AFSI), are precision bayonet‑lock optical interfaces designed for high‑reliability and space‑applicable fiber interconnects. Using the industry‑standard Straight Tip (ST) coupling mechanism, these connectors deliver secure engagement and accurate optical alignment across vibration and thermal cycles typical of spacecraft, satellite, and airborne platforms.

Mechanical Design

The connectors feature a compact cylindrical body with bayonet‑style coupling and a thread‑secured jam nut assembly that mounts through a bulkhead or panel. The design employs a lock washer and adapter system ensuring mechanical stability and repeatability in limited spaces. Protective caps are supplied for shipping and handling purposes; however, non‑qualified covers should be discarded before flight use.

Dimensional Reference

• Overall length: approximately 1.17 in (29.7 mm)
• Body diameter: approximately 0.63 in (16 mm)
• Recommended panel cutout: 0.385 ± 0.015 in / 0.315 ± 0.005 in diameter
• Maximum panel thickness: 0.083 in (2.1 mm)

These details align with Amphenol drawing standards and should be used for mechanical interface evaluation when integrating ST receptacles into custom chassis or optical adapter panels.

Integration and Application

ST connectors provide a proven single‑fiber coupling format that accommodates both single‑mode and multimode fibers depending on system design. Their mechanical robustness and precise centering ferrule make them suitable for spaceborne and high‑vibration environments when employed with screened, radiation‑tolerant fiber cables. The jam‑nut receptacle form simplifies installation in dense instrument panels and optical payload structures.

Features and Benefits

• Bayonet‑lock coupling for quick, repeatable engagement
• Stable optical alignment under vibration and temperature variation
• Front‑panel jam‑nut mounting with defined cutout geometry
• Compatible with standard ST ferrule polishing and termination processes
• Supports adaptation to space‑qualified components within AFSI optical platforms

Typical Uses

These connectors are utilized in spacecraft payload harnesses, optical instrumentation panels, test equipment, and high‑reliability communication links where contamination resistance and dimensional stability are critical. They complement Amphenol’s broader portfolio of MIL‑PRF‑29504 and expanded‑beam optical interconnect products.