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ST Flange Fiber Optic Adapter – Rugged Bayonet-Style Coupler for Singlemode & Multimode Networks
ST female to ST female flange configuration, available in simplex or duplex types for flexible deployment.
Bayonet-style coupling mechanism enables fast, secure mating with a distinct twist-lock action.
Precision zirconia ceramic alignment sleeve ensures low insertion loss ≤0.2dB and high return loss.
Compatible with both single-mode (G652D/G657A) and multimode fiber systems.
Durable metal (nickel-plated zinc) or flame-retardant plastic housing, compliant with IEC 60874-10-3 and RoHS.
Rated for over 1,000 mating cycles with minimal performance degradation.
Integrated flange design enables secure screw-mounting to patch panels, ODFs, and enclosures.
Color-coded housings (blue for single-mode, beige/black for multimode) for quick identification.
Operating temperature range: -40°C to +85°C, suitable for diverse indoor environments.
What is an ST Adapter Flange Fiber Optic Adapter?
The ST adapter flange fiber optic adapter is a panel-mount coupler designed to provide a precise, low-loss connection between two ST connectors. Featuring a bayonet-style locking mechanism for fast and secure mating, a zirconia ceramic alignment sleeve for optimal optical performance, and an integrated flange for easy panel installation, it is widely used in telecom networks, data centers, and FTTH systems where reliable ST-based connectivity is required.
ST Adapter Specification parameters
- Specification parameters
- OPTICAL CHARACTERISTICS
Specification
| Specification & Value | |
|---|---|
| THE | ≤0.2 dB |
| Repeatability | 200 times |
| Temperature | -40℃ ~ 85℃ |
Part Material
| Part | Material | Quantity |
|---|---|---|
| ST-ADA Dust Cap | PVC | 2 |
| Housing (assembly) | Zinc | 1 |
| Sleeve | ZrO₂ - White | 1 |
Requirement Table
| No. | Requirement | Remarks | |
|---|---|---|---|
| 3.1 | Meet IEC 60874-10-3 | ||
| 3.2 | Meet GR-326 core | ||
| 3.3 | Flame Rating: UL94-V0 | ||
| 3.4 | RoHS compliance: RoHS2.0 | & | REACH |
Product Structure & Composition
ST Interface and Bayonet Coupling: The adapter features ST female receptacles on both ends. The ST connector uses a bayonet-style coupling mechanism-;insert the connector and twist to lock-;providing a fast, secure connection that resists vibration-induced loosening.
Zirconia Ceramic Alignment Sleeve: A precision-machined zirconia ceramic split sleeve aligns the ST connector ferrules with micron-level accuracy, ensuring low insertion loss and high return loss across all mating cycles.
Flange Housing: The integrated flange (full or D-hole mount style) allows secure screw-mounting to patch panels, optical distribution frames, and equipment enclosures. Housings are available in durable nickel-plated metal or flame-retardant plastic (UL94-V0).
Benefits of ST Adapter
Bayonet Locking for Vibration Resistance
The ST adapter‘s bayonet coupling uses twist-to-lock action, ensuring stable connections under vibration or disturbance-ideal for telecom cabinets and industrial use.
Precision Low‑Loss Optical Performance
Zirconia ceramic sleeve aligns ferrules precisely, providing insertion loss as low as 0.2 dB and high return loss, enabling efficient high‑speed transmission with minimal power penalty.
Durable Construction for Long‑Term Reliability
Built with nickel‑plated metal or flame‑retardant plastic, it withstands over 1.000 mating cycles with negligible change. The one‑piece body enhances side‑loading reliability in demanding environments.
Versatile Compatibility and Easy Panel Integration
Supports single‑mode (G652D/G657A) and multimode fiber, with blue (SM) or beige/black (MM) housings for quick visual ID. Flange and D‑hole mount simplify panel installation; simplex/duplex options fit various port densities.
Engineering Applications ST Adapter
Telecom Optical Distribution Frames (ODFs)
In carrier central offices and telecom nodes, the ST adapter is widely used in ODFs to terminate and interconnect ST-based trunk and distribution cables. Its bayonet locking ensures stable connections, while the flange mounting provides an organized patching field for efficient circuit provisioning.
Data Center and Enterprise Networks
For data center and enterprise environments, the ST adapter supports high-density patching in accordance with standards like TIA-942. Its low-loss characteristics and durable construction make it suitable for connecting servers, switches, and storage devices in demanding IT infrastructures.
FTTH and FTTx Access Networks
In FTTH and other FTTx projects, the ST adapter is used in terminal boxes and distribution points to connect drop cables to feeder networks. The rugged flange housing and secure bayonet coupling ensure reliable service delivery even in outdoor or semi-outdoor environments.
CATV and Video Transmission Systems
Cable television (CATV) networks frequently utilize ST connectors in headend equipment and fiber nodes. The ST adapter provides a reliable connection point for video signal transmission, ensuring high-quality delivery with minimal attenuation and reflection.
Shipping & Packaging
Product Comparison：
ST Adapter Flange vs. SC Adapter Flange (Duplex)
| Feature / Dimension | ST Adapter Flange (Duplex) | SC Adapter Flange (Duplex) |
|---|---|---|
| Structure / Form Factor | ST female on both ends. Bayonet-style twist-lock coupling. Available in simplex or duplex. Flange mount with D-hole style. | SC female on both ends. Push-pull latching mechanism. Duplex design. Flange mount with full or reduced flange options. |
| Coupling Mechanism | Bayonet-style: insert and twist to lock. Provides excellent vibration resistance. | Push-pull latch: insert until click. Quick connection but less vibration-proof than bayonet. |
| Typical Applications | Telecom ODFs, legacy ST-based infrastructure, CATV, industrial environments. | High-density data centers, enterprise networks, FTTH panels, modern telecom systems. |
| Key Engineering Pros | - Bayonet locking offers superior vibration resistance. - Well-established in legacy and industrial networks. - Flange design enables secure panel mounting. | - Higher port density due to smaller footprint. - Tool-less push-pull connection is faster. - Color-coded for easy SM/MM identification. |
| Key Engineering Cons | - Larger footprint than SC; lower port density. - Twist-lock requires more connection time than push-pull. | - Push-pull latch can loosen under severe vibration. - Less robust for industrial environments. |
| Tolerance to Vibration / Shock | Excellent; bayonet locking provides stable connection under vibration. | Good, but push-pull mechanism more prone to loosening under extreme vibration. |
| Housing Material Options | Nickel-plated metal or flame-retardant plastic (UL94-V0). | Nickel-plated metal or flame-retardant plastic, with full or reduced flange. |
| Fiber Mode Options | Supports both single-mode and multimode, with appropriate color coding. | Supports both single-mode and multimode, with appropriate color coding. |
| Cost (Relative) | Generally cost-effective for ST-based legacy and industrial deployments. | Cost-effective for high-density modern deployments. |
| Maintenance & Handling | Bayonet mechanism requires occasional inspection; cleaning standard; color coding aids management. | Easy to connect/disconnect; maintenance primarily involves cleaning the alignment sleeve. |
ST Adapter Selection Guide
How to Choose the Right ST Adapter Flange
When selecting an ST adapter flange, first determine your fiber mode: choose a blue housing for single-mode (G652D/G657A) and a beige or black housing for multimode. This ensures compliance with industry standards and prevents cross-connection errors.
Second, decide between simplex and duplex. Simplex is sufficient for unidirectional or single-fiber applications, while duplex is preferred for bidirectional links (e.g., transceivers with separate TX/RX fibers).
Third, consider the mounting environment. For standard patch panels and ODFs, the flange mount with D-hole style provides secure screw-mounting. If your installation is subject to vibration (e.g., industrial sites, outdoor cabinets), the ST adapter's bayonet locking mechanism offers a significant advantage over push-pull designs.
Finally, evaluate housing material: metal (nickel-plated) for maximum durability and mechanical stability, or plastic (UL94-V0 rated) for cost-effective indoor deployments.
Installation Instructions of ST Adapter Flange Fiber Optic Adapter
Panel Mounting
Select cutout per D-hole spec. Insert adapter from front until flush, secure with screws, and align orientation with panel keying for consistent labeling.
Connecting Cables
Inspect and clean ST end‑faces. Insert connector, twist clockwise to lock (click). For duplex, ensure polarity (A‑B) matches Tx/Rx mapping.
Cable Management and Labeling
Route cables with >30 mm bend radius, secure with management bars. Label panel ports and fiber pairs. Color‑coded blue/beige housings provide instant fiber‑type identification, simplifying maintenance.
Download YRTFIBER Product Catalog
Factory Real Shot
Frequently Asked Questions & Quick Inquiry
ST Adapter FAQ
Q1: Are ST adapters available for singlemode and multimode?
A1: Yes-it supports both singlemode (G652D/G657A) and multimode fiber types.
Q2: How does the bayonet locking mechanism benefit installation?
A2: ST uses bayonet locking for fast and secure mating-no twisting motion ensures reliable connections even under vibration.
Q3: What is the insertion loss performance?
A3: Typical insertion loss is ≤ 0.2 dB with high-level return loss (≥50 dB for APC, ≥30 dB for UPC)
A4: Yes-ealed ST adapters (IP64 rated) are available for outdoor and industrial use.
Q5: Is OEM customization supported?
A5: Absolutely. We support OEM/ODM, including connector type, housing material (sealed or not), and fiber compatibility.
What is the typical insertion loss of the ST adapter?
The typical insertion loss is ≤ 0.2 dB, ensuring minimal signal attenuation across the connection.
Can this adapter be used for both single-mode and multimode?
Yes, the adapter supports both single-mode (G652D/G657A) and multimode fiber types. Use the color-coded version (blue for SM, beige/black for MM) to maintain correct system identification.
How does the bayonet locking mechanism work?
ST connectors use a bayonet-style coupling: insert the connector into the adapter and twist to lock. This provides a fast, secure connection that resists loosening under vibration.
How many mating cycles are supported?
The adapter is rated for over 1,000 mating cycles with negligible performance degradation.
Is the adapter compliant with international standards?
Yes, it complies with IEC 60874-10-3, GR-326 core requirements, and RoHS environmental directives.
What is the operating temperature range?
The adapter operates reliably from -40°C to +85°C, suitable for diverse indoor and semi-outdoor environments.
How do I clean the adapter?
Use a dry cleaning cassette or swab specifically designed for ST adapters. Insert the tool into each port and follow the manufacturer's instructions to remove dust from the zirconia sleeve. Regular cleaning helps maintain low insertion loss.
Are sealed ST adapters available for outdoor use?
Yes, sealed ST adapters (IP64 rated) are available for outdoor and industrial applications.
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