Aviom 6416m/RCI/MCS - Manual (Page 136)

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PeciFicAtions
Using DB25 Jacks
The DB25 panel‑mount connectors on Aviom products have #4‑40 UNC
threads. Be sure to get DB25 breakout cables with the correct thread type;
forcing the connectors by using the wrong thread type will strip one or more
of the mating components rendering them unusable.
Strain relief is suggested when using DB25 cable assemblies. DB25 breakout
cables should always be supported when connected to an Aviom product to
reduce the risk of damaging the product’s rear panel.