91H2-25-20-1-B-HE400

Overview

The TE Connectivity 91H2-25-20-1-B-HE400 is a circular MIL-spec backshell designed for D38999 Series III connectors. It features a strain relief boot with an EMI/RFI shielding gasket and a cable clamp. The unit utilizes a shell size 20 interface, compatible with cables up to 0.75 inches in diameter. Constructed from aluminum alloy with cadmium finish, it provides environmental sealing and mechanical protection for high-reliability aerospace and defense applications.

Feature Summary

• Provides EMI/RFI shielding through integrated conductive gaskets
• Includes adjustable cable clamp for secure strain relief
• Designed for environmental sealing against moisture and contaminants

Applications

• Aerospace avionics systems requiring MIL-DTL-38999 compatibility
• Defense communication equipment installations
• High-reliability industrial control environments

Procurement Notes

Verify the specific cadmium plating requirements and environmental compliance status with the manufacturer prior to procurement. Confirm that the shell size 20 designation matches the mating connector housing exactly. Ensure the cable diameter falls within the specified range for the included clamp mechanism to maintain proper strain relief performance.

Selection Notes

Select this component when EMI shielding and environmental sealing are critical for D38999 Series III assemblies. Verify that the aluminum construction meets the weight and corrosion resistance specifications of the target platform. Ensure the straight mounting style aligns with the spatial constraints of the installation panel or chassis.

Part Context

This backshell belongs to the TE Connectivity 91H series, which are standard circular MIL-spec backshells. These components are engineered to complement D38999 Series III connectors, providing essential cable management and environmental protection. The HE400 suffix typically denotes specific material or environmental treatment variations within the product line.

Replacement Considerations

Cross-reference with other manufacturers offering MIL-DTL-38999 compliant backshells. Verify dimensional interchangeability, particularly regarding the shell size 20 interface and overall length. Ensure equivalent shielding effectiveness and environmental sealing ratings are maintained.