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D-sub connector anchor/screw height

D-sub connector anchor/screw height

(OP)
We use D-sub connectors on a few products we make. On one product the receptacles are mounted to a plastic plate with standard jack screws. However because of the thickness of the plastic plate the screws stick out proud of the surface of the connector shroud itself by about 0.07". Everything I've seen before has the anchors flush to the tip of the connector, or at least close. Walking around the shop and observing various D-sub connectors corroborates this. I tried to find some documentation on this but came up empty handed. Can anyone point me to a spec or standard indicating the proper relationship between the anchor and connector? Or can someone confidently say that they should be approximately flush?

Thanks!

RE: D-sub connector anchor/screw height

Many specific a "maximum panel thickness".. like this..
-The maximum recommended panel thickness is 0.062" (0.15 cm).
or this..
-D-Subs are designed for rear-mount applications in panels that are up to 2.0 mm thick. They come with two sets of jackscrews. One jackscrew set is 5 mm long for panel thickness up to 1.2 mm, and the other is 6 mm long for panel thicknesses from 1.2 mm, up to 2.0 mm.
or this
-Maximum recommended panel thickness is 0.078" (0.2cm).

There doesn't seem to be a "standard" that I've found before..

RE: D-sub connector anchor/screw height

you need to make sure you have a reliable connection. Some connector suppliers will provide dimensions on the pins and sockets so you can see the worst case dimension where they will stop making contact. I always go flush (by eyeball, so probably +-10 mil (+-0.25 mm) because 3M offers a wide array of hex standoffs to fit whatever panel thickness I'm dealing with. Worst case I'll add a washer or two to make up the difference.

Z

RE: D-sub connector anchor/screw height

(OP)
Thanks for the feedback. I searched around for male/female 4-40 jackscrews that had a hex post shorter than 3/16", to no avail. That kinda makes sense, as going much shorter won't allow enough thread engagement. If anyone knows otherwise, please let me know!

Otherwise it looks like we'll need to either add a counterbore or use a light gauge material.

RE: D-sub connector anchor/screw height

D-Sub connector spec: MIL-DTL-24308
You can find it on the ASSIST website.

If you ever find yourself looking for the specification that defines almost any piece of technology you can imagine, you can probably find it there. Go there before paying IHS or SAE or ASTM any money. Chances are they bought the standard from the US military and are charging you 50$ to photocopy the data.

STF

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