FQ18 Series 4-Pin Square Flange Male Socket FQ18-4ZJ

FQ Series IP67 Waterproof 4-Pin Circular Connector

Product Information

The FQ Series waterproof circular connector is an enhanced version of the Q Series, developed according to the DZ4Q/RE008-84 standard. Its compact construction combines a bayonet quick-connection mechanism with an improved sealing structure, delivering reliable electrical connection where moisture, vibration, and environmental exposure are concerns.

A key feature is the squirrel-cage elastic contact structure used in the female contacts. Compared with conventional wire-spring structures, this design provides stable contact pressure, low contact resistance, and improved resistance to vibration and impact. With an IP67 protection rating, the FQ Series is suitable for equipment requiring dependable sealed connections.

Key Characteristics

• -- IP67-rated sealing for improved protection against dust and water

• -- Squirrel-cage elastic female contacts for stable electrical contact

• -- Bayonet coupling enables fast and convenient connection

• -- Gold-plated copper contacts for reliable conductivity

• -- Aluminum alloy shell with anodized surface treatment

• -- Compact and lightweight construction

• -- Solder termination for secure cable assembly

• -- Designed for up to 500 mating cycles

Working Principle & Applications

The bayonet mechanism guides the plug into position and locks it through a short rotational movement. During mating, the squirrel-cage elastic contact structure maintains consistent contact pressure between the male and female contacts, helping reduce electrical resistance and connection instability. The sealing structure protects the mating interface against environmental moisture and dust.

The FQ Series is suitable for industrial equipment, electrical systems, automation equipment, instrumentation, outdoor equipment, and other applications requiring sealed circular electrical connections.

Technical Specifications

Advantages & Service

The FQ Series offers a practical combination of waterproof sealing, quick mating, stable contact pressure, compact design, and environmental resistance. OEM/ODM support, samples, bulk orders, technical consultation, connector matching, and cable assembly services are available.

FAQ

Q: What is the protection rating of the FQ Series?
A: It is rated IP67, providing protection against dust ingress and temporary water immersion under specified test conditions.

Q: Why use the squirrel-cage contact structure?
A: It helps maintain stable contact pressure while reducing contact resistance and improving resistance to vibration and impact.

Q: Is the connector suitable for outdoor equipment?
A: Yes, its IP67 sealing and -55°C to +100°C operating range make it suitable for appropriately designed outdoor and industrial equipment.

Q: Can the FQ Series be customized?
A: Contact configurations, cable assemblies, and other project-specific requirements can be discussed with our technical team.

Note: The supplied contact-resistance value was written as “≤2.5 MΩ”. Because contact resistance is normally specified in mΩ, I have presented it as “≤2.5 mΩ” for technical consistency. Please verify the original datasheet before publishing.