This is the kind of 1/4" stereo jack you might find in home stereos and PA systems. Switched contacts allow you to detect whether or not there is something plugged in to the jack. The jack can be panel mounted in an 11mm diameter hole.
The jack comes with a plastic washer and nut for panel mounting.
Note: Looking for a breakout to hook this audio jack up to your project a little easier? Check out the SparkFun TRS Jack Breakout!
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Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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Based on 1 ratings:
The spring contacts look to be better laid out and more reliable than the free floating fully exposed spring ones you see in other/older models. I cant say I like the plastic mounting bezel very much though. One, it doesn't match any other mounting bezels for most any other switch or encoder out there in style, two its plastic in one of probably the most heavily torqued items you would panel mount at all. If it weren't for the ability to mount via holes in the breakout board they also offer then I would have probably bought a different model. The breakout board for this item really saves it.