MS27473E12B4P MIL-DTL-38999 Series II 6-Pin Bayonet Coupling Connector

MS27467 Circular Connectors

MS27473E12B4P MIL-DTL-38999 Series II Connector Overview

The MS27473E12B4P is a 6-pin circular connector from the MIL-DTL-38999 Series II family, engineered for aerospace, defense, and high-reliability electronic systems. Its aluminum alloy housing and gold-plated brass contacts deliver robust mechanical strength and dependable electrical performance in demanding environments.

Key Selection Criteria for the MS27473E12B4P

When evaluating this connector for your application, consider these decision points:

• Mating interface: Confirm the mating plug or receptacle part number and shell size to ensure proper fit with your existing cabling or panel layout.
• Contact configuration: Verify the 6-pin arrangement and pin assignment against your wiring schematic before ordering.
• Environmental sealing: Assess the operating environment for moisture, dust, and pressure extremes to confirm the IP rating meets your requirements.
• Termination method: Determine whether solder, crimp, or PCB termination suits your assembly process and maintenance needs.
• Mechanical mounting: Check the shell size and mounting dimensions against your panel cutout or bulkhead feed-through design.

Construction and Reliability Features

The MS27473E12B4P uses a threaded coupling mechanism that provides secure mating under vibration and thermal cycling. The aluminum alloy shell offers a favorable strength-to-weight ratio, while the gold-plated brass contacts maintain low and stable contact resistance over repeated mating cycles. This construction supports long service life in mission-critical systems where connection integrity is non-negotiable.

Application Suitability and Boundaries

This connector is well suited for avionics racks, ground support equipment, naval electronics, and industrial control systems that demand MIL-spec reliability. It is not recommended for applications requiring high-density pin counts beyond 6 positions, nor for environments where continuous submersion or extreme chemical exposure exceeds the connector's verified sealing and material ratings. For higher pin counts, consider other MS27473 configurations or the MS27467 series.

Installation and Mating Considerations

Before integrating the MS27473E12B4P, verify the following with your engineering team:

• Confirm the mating connector part number and its gender orientation.
• Prepare the cable with the correct conductor size and insulation diameter for the contact barrel.
• Inspect the coupling threads and O-ring seal before each installation to prevent moisture ingress.
• Perform a continuity and insulation resistance check after termination and before final assembly.

Inquiry Checklist for Accurate Quoting

To receive a precise quotation and configuration match, please provide the following details with your inquiry:

• Mating connector part number and shell size
• Pinout or wiring diagram for the 6 contacts
• Cable outside diameter and conductor gauge
• Required electrical load (current and voltage per contact)
• Environmental conditions (temperature range, humidity, vibration profile)
• Order quantity and target delivery schedule

For related MIL-spec connector options, review the MS27467 Circular Connectors catalog or explore the 12G Series Circular Connectors for alternative configurations. If you have a drawing or detailed specification, send it to our team for a rapid compatibility assessment.