ST Fiber Optic Connector
$0.55
ST Fiber Optic Connector is with twist-lock bayonet coupling, its 2.5mm keyed ferrule . Typical ST connector use metal housing.
Description of ST Fiber Optic Connector
ST Fiber Optic Connector stands for Straight Tip – a quick Release bayonet style Connector developed by AT&T. STs were predominant in the late 80s and early 90s.
ST Connectors are among the most commonly used Fiber optic connectors in networking applications. They are cylindrical with twist lock coupling, 2.5mm keyed ferrule. ST Connectors are used both short distance applications and long line systems. The ST connector has a bayonet mount and a long cylindrical Ferrule to hold the fiber. Because they are spring-loaded, you have to make sure they are seated properly. They are easily inserted and removed due to their design. IF you experience high Light loss, try reconnecting.
ST connectors come in two versions: ST and ST-II. These are keyed and spring-loaded. They are push-in and twist types. They are rated for 500 mating cycles. The typical Insertion Loss for matched ST connectors is 0.25 dB.
The ST connector (straight tip) is the standard connector type for installations. It is frequently used in local networks. A typical feature of the ST connector is the bayonet connection, also known as the BFOC connector (bayonet FO connector). The standard ST FO connector for telecommunications (USA), LAN, industry, medical and sensor technology. The ST FO connectors meet the standards: IEC 61754-2 and CECC 86 115-801. The ST Standard mating adapters (metal) can be used for all ST FO connectors (not just Diamond products).
ST fiber connector is with twist-lock bayonet coupling, its 2.5mm keyed ferrule meet the durability and repeatability requirement for the fiber optic links. Typical ST fiber optic connector use metal housing, but plastic housed ST connectors are also used sometimes.
ST connectors are generally three types:
single mode ST UPC fiber optic connector
single mode ST APC fiber optic connector
multimode ST UPC fiber optic connector.
ST connector is with twist-lock bayonet coupling, its 2.5mm keyed ferrule . Typical ST connector use metal housing.
ST connector adopts standard anti-rust and wear-resistant round metal body, and the bayonet is fixed, the connection is firm, and the disassembly is convenient.
High quality ferrules
Selected ceramic ferrule, professional grinding technology, precise docking of fiber end face; lower insertion loss ≤0.15dB, making transmission more stable and connection more efficient.
ST connector Ferrul and Dust Cap
Stable parameter performance
The ST connector provided by HYC meets the working environment of -40~85 °C, with an average of more than 500~1000 insertion and removal tests, with stable performance and reliable quality.
Operating temperature：-40~85℃
Insert-pull test：500-1000 times
Multiple styles available.
ST Optical fiber connector are available in a variety of colors and boots.
ST Optical fiber connector 2.0mm Blue
ST Optical fiber connector 2.0mm Beige
ST Optical fiber connector 2.0mm Violet
ST Optical fiber connector 0.9mm Green
ST Optical fiber connector 3.0mm Black
Compliance with international standards
The ST Optical fiber connector can meet Telcordia GR 326 or IEC 61300-2; it is compliant with RoHS, IEC61754-2, IEC 61753-1 and other standards.
Availability of ST connector
Housing kits without ferrule are available.
ST/PC and ST/APC are available.
single mode ST connector & multimode ST connector available
Simplex ST connector & duplex ST connector available
ST connector drawing
ST connector features
Low insertion loss and back reflection loss
Bayonet style housing for easy termination
ST connector specification
| SPECIFICATIONS | ||
| Single mode | Multimode | |
| Insertion Loss | ≤0.20dB | ≤0.25dB |
| Return Loss | ≥55 dB | |
| Durability | <0.20 dB typical change, 1000 matings | |
| Operating Temperature | -40 to + 85°C | -40 to + 85°C |
| Ferrule Hole Sizes | 125.0+1/-0μm, Concentricity: ≤1.0μm | 125μm, Concentricity: 1≤3μm |
| 125.3+1/-0μm, Concentricity: ≤1.0μm | 127μm, Concentricity: 1≤3μm | |
| 125.5+1/-0μm, Concentricity: ≤1.0μm | 128μm, Concentricity: 1≤3μm | |
| 126.0+1/-0μm, Concentricity: ≤1.0μm | ||
ST connector application
Premise installations
Gigabit Ethernet
Active device termination
Telecommunication networks
Video
Multimedia
https://mefiberoptic.com/product/sc-to-st-adapter-female-to-female-simplex-metal-fiber-optic-hybrid-adapter/
https://mefiberoptic.com/product/st-to-lc-adapter-female-to-female-simplex-metal-fiber-optic-hybrid-adapter/
https://mefiberoptic.com/fiber-optic-connector-types/
FAQ – ST Fiber Optic Connector
What is the difference between ST and SC or LC fiber optic connectors?
ST connectors use a 2.5 mm bayonet-style metal coupling, while SC uses a push-pull square design and LC employs a smaller 1.25 mm latch type ferrule. ST is typically used in legacy LAN and test environments requiring robust connections.
What does ST stand for and how does it connect?
ST stands for Straight Tip. It uses a round bayonet lock mechanism with a 2.5 mm zirconia ferrule that ensures secure and quick coupling, often used for multimode networks and instrumentation setups.
What are the performance specifications for ST fiber optic connectors?
Per Telcordia GR‑326‑CORE, the typical insertion loss of ST connectors is ≤ 0.3 dB and return loss ≥ 45 dB (PC) or ≥ 60 dB (APC). They are qualified under IEC 61300 mechanical and environmental testing.
Is the ST connector suitable for single‑mode and multimode fibers?
Yes. ST connectors can be used with both single‑mode (UPC/APC Polish) and multimode (OM1‑OM3) fibers. They comply with IEC 61754‑2 interface standards for 125 µm fiber.
What materials are used in ST connector construction?
An ST connector typically has a nickel‑plated brass housing, zirconia ceramic ferrule, and rear crimping boot with aramid (Kevlar) strength member, ensuring durability and long‑term stability.
When should I choose an ST fiber optic connector?
Choose ST connectors for legacy LAN systems, industrial networks, or lab applications needing robust, quick bayonet coupling. For high‑density or modern FTTH solutions, SC or LC connectors are recommended.
| Cable Diameter | 0.9mm, 2.0mm, 3.0mm |
|---|---|
| Connector Boot Size | 0.9mm, 2.0mm, 3.0mm |
| Connector Type | ST |
| Durability | ＞500 times，＜0.3dB |
| Ferrule Material | Zirconia Ceramic |
| HS Code | 85367000 |
| Insertion Loss (dB) | Ceramic ferrule concentricity ≤0.3um >>> ≤0.15dB, Ceramic ferrule concentricity ≤0.5um >>> ≤0.20dB, Ceramic ferrule concentricity ≤1.0um >>> ≤0.30dB, Ceramic ferrule concentricity MM ≤3.0um >>> ≤0.30dB |
| Operation Temperature (℃) | -20~70°C |
| Return Loss (dB) | MM ≥30dB, SM ≥50dB(UPC)， ≥60dB(APC) |
| Storage Temperature | -40℃ ～+80℃ |
| Fiber Type | MM G.651 50/125 OM3, MM G.651 50/125 OM4, MM G.651 62.5/125 OM1, MM G651A1a 50/125 OM2, SM G.652D 9/125 OS2, SM G.657A1 9/125 OS2, SM G.657A2 9/125 OS2, SM G.657B3 9/125 OS2, SM NZ G.655 9/125 |
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ST Fiber Optic Connector