🔎 UNIDENTIFIED I found this screw type piece? It’s either a weird screw I’ve never seen before or a gun sight adjustment knob? Not sure but it’s steel.

[DarthYoda333]

I took the pictures after I found it while at the store*. I have never seen a screw like this but it does look like it could be a gun sight adjustment knob maybe? I’m not sure and google gave me no similar results for either a similar knob or screw if it’s just a weird screw.

 

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[DizzyDigger]

Looks like a screw that controls a valve of some type.

 

[1637]

looks like the noob off a old oil light

 

[Randawg72]

It's a knurled thumbscrew, but I can't place the application.
Maybe a pressure release for a hydraulic jack(?)

 

[Doubter in MD]

It looks like a captive screw with the captive washer missing.

 

[Rmeav8r]

Is it broken or twisted off? Captive screw without retaining washer is a good guess as Doubter suggests.

 

[Blackfoot58]

I don’t believe a gun sight adjustment would say Open.

 

[l.cutler]

Certainly not a gun sight adjustment. Off some sort of machinery most likely, but hard to say what. Not terribly old, the phillips screw wasn't invented until the 1930's.

 

[Randawg72]

I still don't know what it was used for,
but I do know where you can get a hundred more of 'em!..

 

[HuntinDog]

Set Screw

 

[ArfieBoy]

It looks a lot like a mounting screw for camera equipment or tripods.

 

[Limitool]

I'm going with a set screw also due to the flat bottom of the screw.

 

[Blackfoot58]

I’m not seeing the set screw idea; at least by my definition. I guess I’d need to see the screw tip better. Possibly I missed something. 👍🏼

 

[russau]

Buy those screws from Randawg72 and start using them on everything and set a fashion STYLE and everyone will want to start using them! You'll be rich beyond your imagination !