Rear mount backshells compatible with jackposts

The go-to backshell for this is the one-piece Cannon ITT steel backshell, such as the DE24657 and its cousins.

Newark page for the DE24657:https://www.newark.com/cinch-connectivity-solutions/de24657/junction-shell-size-de-steel/dp/45F986#anchorTechnicalDOCS

The problem with this backshell is its coating of yellow chromate (apparently there is some zinc too). This may not be vacuum chamber compatible.

They make a clear coated one but it's oddly enough clear chromate.

Here is a link to the PDF of the full CINCH catalog. The DE24657 is on page 9: http://www.farnell.com/datasheets/671881.pdf?_ga=2.28253820.1338228539.1551109163-1653510471.1485545260

There are a few stamped sheet metal backshells that can possibly be used for rear panel mounting. These include the 3M 3357 (held together with a festive plastic nut on the back so it's not vacuum compatible), some two piece TE emi hoods with a very thin front channel (https://www.mouser.com/ProductDetail/TE-Connectivity/1-2308340-5?qs=%2fha2pyFaduj2ev0%252b1%252bYgy0scmK3sARzLM8%2f4k84RMN4W%2fcKQ6Zc%252bZQ%3d%3d), these custom one piece backshells: https://www.stahlmetall.com/pages/d-sub-rectangular-large-cable-entry-emi-rfi-shielded-backshell-metal-nickel-zinc-plated and something similar from the more reputable Plamco: http://www.polamco.com/bt-series-291/

Glenair has the super deluxe stainless-steel panel mount backshell series 500T009. https://cdn.glenair.com/catalogs/rectangular-connector-backshells.pdf In their same day stock the part number 550T009M1R3L0 is the E size, with no EMI gasket and strangely compatible with our milled panel thickness. In Octopart it shows that Powell sells it for $180 each in quantities of 10.

CINCH also made this wonderfully primitive looking single piece rear mount backshell called the 217 which includes designs with a straight exit and 4-40 tapped holes, but nobody sells them and they are probably discontinued by now

Here is a catalog page for one at Allied, which is linked to by a page for an electronics distributor in India: https://www.alliedelec.com/product/cinch/21715h-r/70544301/

Here is a fairly new looking datasheet for the 217 that still doesn't go a long way towards explaining what the weird extra piece is for: http://www.farnell.com/datasheets/22727.pdf

Octopart has some hits for the 9-pin version, including Allied and Arrow (both not in stock): https://octopart.com/search?q=2179H

The arrow link is revealed to be a "direct ship" scam: https://www.arrow.com/en/products/217-9h/cinch-connectivity-solutions

HD-104 backshells

Aside from Glenair, few sources exist for backshells for HD-104 connectors, which are the rarely used "size 6" D-sub body, slightly bigger in all dimensions than the DD-50 or "size 5".

Strangely, the faeries put a size 6 backshell in one of my desk drawers, I don't know where it came from, and still haven't figured out how to buy them in the U.S.

They are made by a company called Inotec out of Germany. Their website in english: http://www.inotec-electronics.com/cms/servlet/Query?node=108422&language=2

Their german website translated by google: http://translate.google.com/translate?hl=en&sl=de&u=http://www.inotec-electronics.com/

Their catalog: http://www.inotec-electronics.com/cms/files/1/22286618732500.pdf

Search the catalog for part number DG104MSX.

How to pillage Glenair's next day stock

When ordering backshells from Glenair:

The rectangular backshell online catalog here has both D and MDM:

http://www.glenair.com/backshells/rectangular/index.html

each of which shows all of the models with pictures and links to the datasheets. Despite the simple model numbering format given on these top pages, some of these backshells have an actual part number xxx-yyy<+stuff>, while some have xxxTyyy<+stuff> where T is for top exit for wires. Plug the first part of the actual part number, not the simple model number, into the parts search here:

http://www.glenair.com/html/sameday.htm

which is also the 4th link down on the right of the company's home page, and get back exactly which part numbers (i.e. which options) are kept in stock. The home page also has a link to a page showing their distributors, the only recognizable ones of which are TTI (good web site) and Arrow (can only read their site with firefox).

Only a range of in stock part quantities is shown, and if you call glenair sales they still won't tell you exactly how many are in stock, but apparently no matter what there's only a 2-3 day lead time if it's on the list.