MS27473E12B4S 4-Pin MIL-DTL-38999 Series II Bayonet Socket Connector

MIL-DTL-38999 MS27467 Circular Connectors

MS27473E12B4S 4-Pin Circular Socket Connector Overview

The MS27473E12B4S is a 4-pin MIL-DTL-38999 Series II circular socket connector engineered for marine, shipboard, and industrial environments where durability, compactness, and reliability are essential. Its Shell Size 12 configuration allows for multiple signal or low-power connections in tight spaces without compromising performance.

Built with a high-strength aluminum alloy shell, this connector is designed to withstand corrosion, vibration, and harsh environmental conditions, making it ideal for navigation systems, industrial machinery, and control modules. The bayonet coupling mechanism ensures secure and stable mating, even under mechanical stress or high-vibration conditions.

With crimp termination and IP67 sealing, the MS27473E12B4S guarantees consistent electrical performance while providing protection against dust, moisture, and saltwater exposure. Its wide temperature range ensures operation from -65°C to +175°C, making it suitable for extreme marine or industrial environments.

Key Selection Considerations

When evaluating the MS27473E12B4S for your application, consider these decision points:

• Space-Saving 4-Pin Socket – Efficient integration in compact systems where panel space is limited.
• Robust Environmental Sealing – IP67 protection for wet and dusty conditions, including saltwater exposure.
• Corrosion-Resistant Aluminum Shell – Long-term reliability in harsh marine and industrial environments.
• Bayonet Locking Mechanism – Ensures secure connections with vibration resistance during operation.
• Wide Operating Temperature – Reliable performance from -65°C to +175°C for extreme conditions.

Application Fit and Boundaries

The MS27473E12B4S suits navigation systems, industrial machinery, and control modules requiring a compact, sealed connection. Its 4-pin configuration supports signal or low-power circuits in tight spaces.

This connector is not intended for high-current power distribution or applications requiring frequent unmating under load. For higher pin counts or different shell sizes, consider other MIL-DTL-38999 Series II variants. Confirm your cable diameter and contact requirements before ordering, as crimp termination requires specific tooling.

Mating and Installation Guidance

This socket connector mates with a corresponding MIL-DTL-38999 Series II plug with bayonet coupling. Verify the mating plug part number and pin arrangement before integration. For installation planning, confirm the following with your engineering team:

• Required cable diameter and wire gauge for crimp contacts
• Panel cutout dimensions for Shell Size 12 mounting
• Mating plug series and keying configuration
• Environmental exposure conditions beyond IP67 rating

Quality and Reliability Considerations

The aluminum alloy housing with gold-plated brass contacts supports consistent signal integrity in demanding environments. The bayonet coupling provides positive locking feedback during mating, reducing the risk of partial connection. For applications with extreme vibration, verify that the mounting hardware and cable strain relief meet your system requirements.

Inquiry Checklist

To receive accurate matching and configuration support, please provide the following when inquiring:

• Mating plug part number or connector series
• Required pin count and contact arrangement
• Cable type, wire gauge, and outer diameter
• Operating environment details (temperature, moisture, vibration levels)
• Panel thickness and mounting constraints

For related MIL-DTL-38999 Series II options, review the MIL-DTL-38999 MS27467 Circular Connectors catalog. For higher-density configurations, the MS27473E14B35P 37-Pin MIL-DTL-38999 Series II Circular Plug Connector may be relevant.

Contact our engineering team with your application details to confirm compatibility and receive ordering guidance.