CESS Banana Female Jack Socket - 4mm Banana Socket Soldering type (10 PACK)

Glad I checked before drilling and soldering to install these banana jacks in my project. I put a Pomona banana jack into one of these jacks. The fit is ok, but the metal part of the jack slipped out partially as the plug was removed.First photo shows shows two of the jacks. One is as it arrived. The other shows the metal part of the jack slipped out as the banana plug pulled out of the jack.The plug-to-jack friction is more than the friction that holds the metal part within the insulator part of the jack. It looks like these jacks are manufactured by pressing the metal portion of these jacks into the plastic insulator instead of molding the insulator on metal. The metal part could slide and twist and that could break the wiring inside the project box.I don't trust these jacks. If I had these already built into my project, I would secure the metal part with a dab of JB-Weld epoxy. For the cost of the glue I could have used better jacks.Update: I found a use for these jacks that is not worth the price of epoxy glue. I had 4-wire phone cord with gator clips soldered on. The fragile wires keep breaking at the solder joints, so I attached four of these jacks using an expired credit card to mount the jacks and provide strain relief for the cord. So now I can use banana-to-gator voltmeter leads with this. While assembling, I noticed one of the nuts did not tighten enough to keep the jack seated. The plastic threads stripped. While soldering, I noticed that the plastic swells. The nuts are not removable now. One of the jacks swelled enough to split the plastic (second photo).So, these jacks need a precise mounting hole with matching flats. Mounting needs to be done with precise torque. Soldering needs to be done quickly with precise heat. On a production line it may be possible to install these in a product, but ... After doing everything right, these jacks are still going to fail on the first plug insertion or soon thereafter. These jacks are going direct to landfill dragging with them whatever they are built into.Buyer, please don't buy these jacks. Manufacturer, please don't make these jacks.

Don't buy these if you want them to stay tight in your project. The threads are so soft that they will strip well before the lock washer starts to compress. I had to hot glue mine and I hope they stay!

The plastic threads on the jack are so soft and shallow that it is impossible to tighten the jack down without stripping the threads. Easily bendable solder posts.

Made tester for my fuel sender gauge. Works great!