MS27497 Military Connectors Series Specifications

PT Series Connectors Catalog Types, Ratings, Termination

MS27497 Military Connectors: Selection Guide and Key Specifications

When you need a rugged, MIL-DTL-38999 Series I circular connector for demanding military, aerospace, or industrial applications, the MS27497 series offers a proven solution. This guide helps you evaluate the MS27497 against your specific interface, environmental, and electrical requirements before you specify a part number.

What Defines the MS27497 Connector Series?

The MS27497 is a bayonet-coupling, rear-removable crimp contact connector designed for high-vibration environments. It is part of the broader D38999 family, which is known for its compact size, high-density contact arrangements, and reliable environmental sealing. The series is available in a wide range of shell sizes and insert arrangements to match your cable-to-panel or cable-to-cable needs.

Core Decision Points for MS27497 Selection

• Mating Interface and Coupling: The MS27497 uses a quick-action bayonet coupling mechanism, which provides a positive lock and visual confirmation of full mating. This is a key differentiator from threaded MIL-DTL-5015 connectors.
• Contact Arrangement and Density: Choose from a full spectrum of insert arrangements and core counts. Verify the specific pin layout, contact size, and gender (pin or socket) against your wiring diagram before ordering.
• Environmental Sealing: The series is designed to meet IP-rated sealing when mated. Confirm the specific IP rating and temperature range for your application, as performance can vary with the shell style and accessory configuration.
• Electrical Performance: Review the rated current, voltage, and contact resistance for your chosen contact size. These values are defined by the insert arrangement and the crimp contacts you select.
• Termination Method: The MS27497 is designed for rear-release crimp contacts. This supports field-maintainable, high-density wiring and requires the correct crimp tooling and insertion/removal tools.

Understanding the MS27497 Interface and Construction

This series is a wall-mounting receptacle, typically used on the bulkhead or panel side of the connection. It accepts a standard D38999 plug. The shell is constructed from corrosion-resistant materials and is available with various platings to meet specific environmental and EMI/RFI shielding requirements. The connector's design ensures proper keying and polarization to prevent mismating.

Electrical and Environmental Limits

When specifying the MS27497, you must distinguish between the rated values of the connector series and the derating required for your specific operating conditions. The catalog provides baseline ratings for current, voltage, and temperature. For high-altitude or high-temperature applications, consult the derating curves to ensure safe operation. The connector's sealing performance is verified in the mated condition with the correct backshells and accessories installed.

Application Fit and Installation Considerations

The MS27497 is suited for applications where a secure, quick-disconnect connection is required in a compact footprint. This includes avionics, ground vehicles, shipboard systems, and industrial equipment exposed to shock, vibration, and moisture. Before installation, confirm the panel cutout dimensions, mounting hole pattern, and the required cable entry size for your chosen backshell.

Installation and Maintenance Checklist

• Verify the shell size and insert arrangement match your cable bundle and contact count.
• Use the specified crimp tool and positioner for the contact size you are terminating.
• Confirm the correct contact insertion and removal tool for rear-release contacts.
• Ensure the mating plug and backshell are compatible with the MS27497 wall-mounting receptacle.
• Check the torque requirements for the mounting nuts and coupling ring to maintain the environmental seal.

Next Step: Verify Your Part Number

To move forward, compare your wiring requirements against the detailed insert arrangements and contact ratings in the catalog. If you need to understand how this series compares to other MIL-DTL-38999 configurations, review the MS27505 Military Connectors Series Overview for a different shell style. For a broader look at the connector family, the PT Series Connectors Catalog provides additional context on types, ratings, and termination methods.