MS27473E12B4P 4-Pin IP67 Bayonet Circular Connector

MIL-DTL-38999 MS27467 Circular Connectors

MS27473E12B4P 4-Pin Circular Connector – Shell Size 12, Series II, IP67 Bayonet Plug

The MS27473E12B4P is a 4-pin MIL-DTL-38999 Series II circular plug designed for marine, shipboard, and industrial applications where reliability and compact size are essential. Its Shell Size 12 housing and bayonet-coupled pin contacts provide stable electrical connections in harsh and high-vibration environments.

Constructed with a corrosion-resistant aluminum alloy shell, this connector is suitable for saltwater exposure, high humidity, and industrial harsh conditions. The IP67-rated sealing ensures dependable operation against dust and water ingress, making it ideal for navigation, communication, and control systems.

The crimp termination offers consistent electrical performance while simplifying assembly and maintenance. Its compact 4-pin layout allows designers to integrate multiple signal lines in a small footprint without sacrificing durability or performance.

Key Selection Considerations

When evaluating this connector for your system, consider the following decision points:

• Pin Configuration: The 4-pin layout suits compact signal routing where space is limited but multiple lines are required.
• Coupling Mechanism: Bayonet coupling provides a secure, vibration-resistant connection with quick mating and unmating compared to threaded alternatives.
• Environmental Protection: IP67 sealing protects against dust ingress and temporary water immersion, appropriate for exposed marine and industrial locations.
• Termination Method: Crimp termination supports consistent field assembly and simplifies maintenance compared to solder versions.
• Temperature Range: The -65°C to +175°C operating range covers most marine and industrial thermal extremes.

Application Fit and Boundaries

This plug is well suited for navigation systems, communication equipment, control modules, and sensor interconnects on ships, offshore platforms, and industrial machinery where vibration and moisture are present. Its aluminum alloy shell with corrosion-resistant finish handles saltwater exposure and high-humidity conditions effectively.

For applications requiring higher pin counts or different shell sizes, consider the related MIL-DTL-38999 MS27467 Circular Connectors series. This connector is not intended for submersion beyond IP67 temporary immersion ratings, nor for applications requiring hermetic sealing or extreme chemical exposure beyond standard marine environments. Verify your specific cable diameter and contact size compatibility before ordering.

Installation and Mating Requirements

Before integrating this plug into your assembly, confirm the following:

• Mating receptacle type and shell size compatibility
• Contact crimp tooling and insertion/removal tool specifications
• Cable diameter range suitable for the backshell or strain relief
• Panel cutout dimensions if mounting to a bulkhead or enclosure

Quality and Reliability Considerations

The MS27473E12B4P is manufactured to MIL-DTL-38999 Series II specifications, providing a proven design baseline for defense and industrial applications. The gold-plated brass contacts ensure low and stable contact resistance over repeated mating cycles. The bayonet coupling mechanism is designed to maintain engagement under vibration, reducing the risk of intermittent signal loss in dynamic environments.

Ordering and Inquiry Checklist

To ensure correct configuration and availability, please provide the following when requesting a quotation:

• Quantity required and target delivery schedule
• Mating receptacle part number or series
• Cable type, outer diameter, and conductor gauge
• Required accessories: backshells, strain reliefs, or sealing grommets
• Any special plating or finish requirements

For additional configuration options, review the 12G Series Circular Connectors for alternative pin counts and mounting styles. Contact our engineering team with your application details to confirm compatibility and lead time.