D38999/26FH35SN

D38999/26FH35SN — MIL-DTL-38999 Series III Straight Plug (Shell Size 23, 100 Socket Contacts)

D38999/26FH35SN is MIL-DTL-38999 Series III circular connector — a free-hanging (in-line) straight plug with EMI grounding fingers. It is one of the highest-density options in the Series III family, packing 100 gold-plated crimp socket contacts into a size 23 shell, with an electroless nickel finish for a lighter, non-magnetic alternative to cadmium-plated shells.

Built for harsh military, aerospace, and industrial environments, it withstands extreme shock, vibration, and temperature extremes while maintaining a reliable, quick-disconnect interface via Tri-Start coupling thread.

Key Specifications

How to Read the Part Number

D38999/26FH35SN breaks down as follows:

• D38999/26 — Base MIL-DTL-38999 Series III part number for a free-hanging straight plug with EMI grounding fingers
• F — Shell finish: aluminum, electroless nickel (48-hour salt spray, -65°C to +200°C — a higher temperature range than cadmium-plated Class W, but lower corrosion resistance)
• H — Shell size letter code for shell size 23
• 35 — Insert arrangement, defining a 100-position contact layout
• S — Contact type: socket (female) contacts
• N — Polarization/keying position: normal

This high-count insert arrangement (23-35, 100 positions) is one of the densest standard layouts in the Series III catalog, making this plug well suited for multi-signal or multi-channel harness consolidation.

Typical Applications

• High-density avionics and flight control wiring harnesses
• Radar, sensor arrays, and multi-channel data acquisition systems
• Military ground vehicles and shipboard electronics needing many low/medium-current signal paths in one connector
• Test equipment and ground support systems requiring rapid, reliable disconnects
• Any application needing a lightweight, non-magnetic (nickel-finish) alternative to cadmium-plated shells

Mating Information

D38999/26FH35SN is a free-hanging plug designed to mate with the corresponding D38999/20FH35PN — a wall-mount receptacle, same shell size 23 and insert arrangement 35, fitted with pin contacts. Always confirm the exact mating part number and finish class against your harness drawing before ordering.

FAQ

1. What does D38999/26FH35SN mean?

It decodes to a MIL-DTL-38999 Series III straight plug (/26), electroless nickel finish (F), shell size 23 (H), insert arrangement 35 (100 positions), socket contacts (S), normal keying (N).

2.How many contacts does D38999/26FH35SN have?

100 socket contacts, per insert arrangement 23-35 — one of the highest contact counts available in the Series III standard.

3. What is the shell size of D38999/26FH35SN?

Shell size 23 — shown by the letter “H” in the part number (shell size letter codes: A=09, B=11, C=13, D=15, E=17, F=19, G=21, H=23, J=25).

4. What’s the difference between the F (nickel) and W (cadmium) finish?

F-class connectors use electroless nickel plating, offering a higher operating temperature range (-65°C to +200°C) and a lighter, non-magnetic finish, but lower salt spray resistance (48 hours) than W-class olive drab cadmium (500 hours). Choose based on your environment: F for high-temperature or non-magnetic requirements, W for maximum corrosion resistance.

5. What contacts and crimp tools does D38999/26FH35SN use?

It uses standard AS39029/M39029 crimp socket contacts, size #22D, compatible with 22–28 AWG wire; contacts and the corresponding insertion/removal and crimp tooling are typically ordered separately.

6. Is there a receptacle version of this connector?

Yes — D38999/20FH35PN is the matching wall-mount receptacle (pin contacts), same shell size and insert arrangement, designed to mate with this plug.