MS27473E8B98S MIL-DTL-38999 3-Pin Bayonet Coupling Connector

MS27467 Circular Connectors

MS27473E8B98S MIL-DTL-38999 3-Pin Circular Connector Overview

The MS27473E8B98S is a 3-pin circular connector built to MIL-DTL-38999 specifications, designed for dependable electrical connectivity in demanding aerospace and defense applications. Its construction emphasizes mechanical strength, vibration resistance, and long-term reliability under harsh operating conditions.

With a compact circular form factor and a precision contact system, this connector suits applications where space efficiency and signal integrity are critical. The bayonet coupling mechanism provides a secure, stable connection even when subjected to mechanical stress and shock.

Key Selection Considerations

• Configuration: This model is a 3-pin connector available in male or female variants. Confirm the required gender and mating-side interface before ordering.
• Coupling System: The bayonet locking mechanism enables rapid mating and unmating while maintaining a secure connection in high-vibration environments.
• Contact Termination: Crimp termination supports field assembly and maintenance. Ensure the correct crimp tooling and contact removal tool are available for your wire gauge.
• Environmental Rating: The connector operates across a wide temperature range, making it suitable for extreme thermal cycling conditions. Verify the specific IP rating required for your un-mated or mated application.

Application Scope

This connector is intended for aerospace systems, defense electronics, and mission-critical equipment where consistent electrical performance is non-negotiable. Its robust construction and gold-plated brass contacts help maintain stable signal transmission while resisting corrosion and environmental stress.

Typical uses include avionics, communication systems, and instrumentation where space is limited but reliability is paramount. For applications involving downhole tools or other extreme environments, confirm that the temperature and vibration profile matches the connector's rated capabilities.

Specification Interpretation

The MS27473E8B98S is rated for 7.5A per contact with a 600V AC working voltage, and it withstands a 1800V AC dielectric test for one minute. Insulation resistance is specified at 5000 MΩ minimum, with contact resistance held to ≤3 MΩ. These values indicate a connector designed for signal-level and moderate power applications rather than high-current distribution.

The housing is machined from aluminum alloy, with brass contacts plated in gold for low and stable contact resistance. The insulator material provides stable dielectric performance across the full -65°C to +175°C operating range. For detailed dimensional data and mounting specifications, refer to the Technical Specifications field.

Suitability Boundaries

Suitable for: Aerospace and defense electronics, vibration-prone installations, and applications requiring a compact, high-reliability circular interface with crimp termination.

Not suitable for: High-current power distribution beyond the 7.5A contact rating, subsea or continuous immersion applications without verifying the specific sealing configuration, or installations requiring a threaded coupling mechanism. This is a Series I bayonet-coupling connector; do not assume interchangeability with other MIL-DTL-38999 series variants.

Inquiry Checklist

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

• Required gender (plug or socket) and mating connector part number
• Pinout or wiring diagram for your application
• Cable outside diameter and conductor size for crimp contact selection
• Electrical load (current and voltage) per contact
• Environmental requirements (temperature, vibration, sealing)
• Order quantity and target delivery schedule

For related configurations, see the MS27473 10-pin MIL-DTL-38999 Series II connector or the MIL-DTL-38999 connector application in downhole tools for reference.