38999 Connectors Product Roundup  

By AJ Born | September 01, 2026

This week’s Product Roundup highlights 38999 connectors from leading connector manufacturers and suppliers.

38999 Connectors

ITT Cannon’s KJA/KJB (D38999 III) familyITT Cannon’s KJA/KJB (D38999 III) family has expanded to include a full range of high-speed and Ethernet layouts with Twinax, Quadrax, OctoRax and OctoGig termini. This includes termini tested and designed per ARINC and BACC47 specifications and EN50173 test protocols. They feature 100 Mb/s – 10 Gb/s data rates, low insertion force contacts, environmental and non-environmental versions, and a full range of D38999 shell sizes and styles.

Amphenol PCD’s Rhino 38999Amphenol PCD’s Rhino 38999, a groundbreaking integration of field-proven MIL-DTL-38999 Series III circular connectors with hyperbolic contacts, is pushing the boundaries of high power connector technology. Designed to meet the latest military and industrial specifications, Rhino 38999 is the go-to choice for critical power applications, boasting unique features like six keyways, anti-decoupling mechanism, superior EMI performance, and high vibration tolerance. With versatility in shell materials, plating finishes, and custom configurations, Rhino 38999 ensures unmatched reliability and performance across military, aerospace, and industrial sectors.

The RJ45 D38999 C-RJFTV Series from Cinch Connectivity SolutionsThe RJ45 D38999 C-RJFTV Series from Cinch Connectivity Solutions is a harsh environment circular connector that houses a standard RJ45 (8P8C) interface inside a MIL-DTL-38999 Series III shell, bringing commercial Ethernet into military and aerospace applications without custom terminations. It supports 10/100/1G Base-T and pairs with an EMI-shielded, pre-terminated cable cordset. Shell size 17 is the smallest available on the market for 1G Base-T, and four keyway polarization options prevent cross-mating in dense panels. The series is offered in shell sizes 17 and 19 with jam nut and flange mounting, IP68 sealing, and a choice of aluminum (nickel or olive drab), stainless steel, or marine bronze finishes, rated for 500 mating cycles.

Smiths Interconnect’s MIL-DTL-38999 Differential Twinax and Quadrax connectorsSmiths Interconnect’s MIL-DTL-38999 Differential Twinax and Quadrax connectors are high-performance interconnect solutions designed for defense, aerospace, and other harsh-environment applications requiring reliable high-speed data transmission. Based on the proven MIL-DTL-38999 standard, these connectors can be driven via matched-impedance differential pair interconnections for board-to-board high-speed data transfer.

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AJ Born
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