GJB599 Series Lanyard Release Circular Connector

GJB599 Series Lanyard Release Circular Connector | Missile & Launcher Interface

The GJB599 Series Lanyard Release Connector represents the pinnacle of missile interface technology, engineered specifically for the most critical connection in airborne weapons systems—the interface between launch platform and missile. Fully compliant with GJB1188A and GJB599A (MIL-DTL-38999) Series III requirements, this connector family delivers proven reliability in the harshest operational environments. Featuring a three-start threaded coupling with integral ratchet anti-loosening mechanism, these connectors provide rapid, secure mating while ensuring positive separation when commanded. The innovative grounding spring design ensures continuous shell-to-shell electrical continuity for superior EMI shielding. With hybrid configurations supporting high-frequency, low-frequency, and fiber optic signal transmission (25-20 interface), the GJB599 Series enables complete weapon system integration. From fighter aircraft to ground launch systems, these connectors deliver when milliseconds matter.

Product Descriptions from the Supplier

The GJB599 Series Lanyard Release Circular Connector is a specialized interconnect solution designed for the most demanding application in aerospace—the interface between airborne launch platforms and missiles. Meeting the stringent requirements of GJB1188A and GJB599A (MIL-DTL-38999) Series III, these connectors are available in two standard GJB1188A interface configurations (25-20 and 25-11) as well as the complete range of GJB599 III Series shell sizes 1-23, providing maximum design flexibility for weapon system integrators.

Description

The connector features a robust three-start threaded coupling system with an integrated ratchet anti-loosening mechanism, ensuring secure mating under severe vibration while enabling rapid connection and positive lanyard release when required. A precision-engineered grounding spring maintains continuous electrical continuity between plug and receptacle shells, providing superior EMI shielding performance that meets stringent military requirements.

For the 25-20 interface configuration, the connector supports hybrid signal transmission combining:

• Electrical signals (low frequency)
• GJB289A data bus (high frequency)
• Two fiber optic ports (reserved for optical signal transmission)

Contacts are terminated via crimping using advanced tooling systems, supporting multiple contact types including 12# shielded, 12# coaxial, and 8# twinaxial configurations, all interchangeable within the same connector shell. Various shielded cable clamp options provide both mechanical cable retention and continuous EMI shielding from cable braid to connector shell.

With IP65-rated sealing at both the mating interface and rear cable entry, combined with robust vibration resistance and reliable separation characteristics, the GJB599 Series is fully qualified for the most severe airborne environments.

Specifications

Applications

• Airborne Missile Systems: Fighter aircraft, bombers, and attack helicopters.
• Ground Launch Systems: Mobile and fixed ground-based missile launchers.
• Naval Launch Systems: Shipboard vertical launch systems (VLS).
• Weapon Interface: Smart bombs, guided munitions, and external stores.
• Data Bus Networks: GJB289A (MIL-STD-1553) data transmission.
• Fiber Optic Ready: Two reserved ports for fiber optic signal transmission.

Functionality

• Three-Start Threaded Coupling: Rapid engagement with just 1.5 turns, featuring ratchet anti-loosening for vibration-proof operation.
• Grounding Spring: Ensures continuous shell-to-shell electrical continuity for EMI shielding effectiveness.
• Lanyard Release: Positive separation mechanism ensures reliable missile/launcher disconnect.
• Hyrid Signal Capability (25-20): Combines electrical, data bus, and fiber optic signals in a single connector.
• Crimp Termination: Field-proven reliable terminations using advanced tooling systems.
• Interchangeable Contacts: Standard contacts can be replaced with shielded, coaxial, or twinaxial versions as needed.
• Shielded Cable Clamps: Maintain EMI continuity from cable braid through connector shell.

Key Features​​​​​​​

• GJB1188A / GJB599A Compliance: Meets the most stringent Chinese military specifications for missile/launcher interfaces.
• U.S. Interchangeable: Fully compatible with corresponding MIL-spec part numbers for global interoperability.
• Ratchet Anti-Loosening: Prevents connector back-off under severe vibration—critical for airborne applications.
• Integrated Grounding Spring: Eliminates need for separate grounding straps, improves EMI performance.
• Hybrid Contact Capability: Signal, power, data bus, coaxial, and fiber optic in one connector.
• IP65 Sealed: Protected against dust and water jets, suitable for exposed installations.
• Comprehensive Contact Range: From 22D (5A) to 10# (33A) covering all missile interface requirements.
• Advanced Tooling Support: Specialized crimp and insertion/removal tools available.

Custom Design

The GJB599 Series platform offers extensive customization for weapon system requirements:

• Mixed Contact Arrangements: Custom configurations combining signal, power, coaxial, and fiber optic contacts.
• Special Shell Platings: Enhanced finishes for extreme marine, chemical, or high-altitude environments.
• Custom Keying: Unique polarization schemes for multi-connector launcher interfaces.
• Fiber Optic Integration: Fully engineered fiber optic contact solutions available.
• Cable Assembly Integration: Complete custom harness solutions with EMI shielding and overmolding.
• Tooling Packages: Custom crimp and assembly tooling for production environments.

Why Choose MXTD

At MXTD, we specialize in the most critical connections in aerospace—the interface between launch platform and weapon. The GJB599 Series represents our commitment to mission-critical reliability, engineered to meet the exacting requirements of GJB1188A and GJB599A (MIL-DTL-38999) standards. With decades of cumulative experience in military connector design and manufacturing, we understand that in weapon systems, there is no margin for error. Every GJB599 connector undergoes rigorous testing—from contact resistance verification to EMI shielding effectiveness to lanyard release force validation—before leaving our facility. Our engineering team works closely with weapon system integrators to ensure that every interface meets the unique requirements of the platform and munition. When you choose MXTD, you're partnering with a team committed to technical excellence, quality assurance, and the success of your mission.

FAQ

Q: What is the difference between the 25-20 and 25-11 interface configurations?
A: The 25-20 interface supports hybrid transmission including electrical signals, GJB289A data bus, and two fiber optic ports. The 25-11 interface is typically configured for specific weapon system requirements. Both meet GJB1188A specifications.

Q: Are these connectors interchangeable with U.S. military part numbers?
A: Yes. The GJB599 Series is designed to be fully interchangeable and intermateable with corresponding MIL-DTL-38999 Series III connectors meeting the same interface requirements.

Q: What is the purpose of the grounding spring?
A: The grounding spring ensures continuous electrical continuity between plug and receptacle shells, providing superior EMI shielding without requiring separate grounding straps. This is critical for maintaining signal integrity in high-interference environments.

Q: How does the ratchet anti-loosening mechanism work?
A: The three-start threaded coupling incorporates a ratchet mechanism that prevents the connector from backing off under vibration while still allowing rapid engagement and positive lanyard release when required.

Q: What contact types are available?
A: Standard contacts include 22D, 20#, 16#, and 10# sizes. Specialized contacts include 12# shielded, 12# coaxial, and 8# twinaxial configurations, all interchangeable within the same shell.

Q: What is the IP rating?
A: The GJB599 Series achieves IP65 protection when mated, meaning it is dust-tight and protected against water jets from any direction.

Q: Can these connectors be used for fiber optic transmission?
A: The 25-20 interface configuration reserves two ports specifically for fiber optic signal transmission. Fiber optic contacts and termination tooling are available.

Q: What tooling is required?
A: Specialized crimp tools and contact insertion/removal tools are available for all contact types. Please contact our sales team for specific tooling recommendations.

Q: What is the vibration rating?
A: These connectors are designed to withstand the severe vibration environments typical of airborne launcher applications, meeting all GJB599A III requirements.

Q: Are protective covers available?
A: Yes. Protective covers for both plugs and receptacles are available as accessories, maintaining IP sealing when connectors are unmated.

Contact Us

Ready to specify the most reliable missile/launcher interface for your weapon system? Our technical experts are standing by to discuss your specific application requirements and recommend the optimal GJB599 Series configuration—from interface type to contact arrangement to termination tooling.

Whether you need standard units for immediate deployment or custom-engineered solutions for next-generation weapons, we're here to help you achieve your mission objectives.

Reach out to our team today: manager04@mxtdinfo.com

Let us show you how our GJB599 Series lanyard release connectors can deliver uncompromising reliability for the most critical connection in your weapon system.