Electronics > Projects, Designs, and Technical Stuff
Mystery screw identification
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rs20:
Folks,

I need more copies of the screw which I have described/photographed below. Any info, from identifying the basic thread type standard right up to a specific part number, would be most greatly appreciated.

Information #1

The screw is one of the ones used to affix a PDL DBF30 faceplate (i.e., the only four screws that you can see simply by opening up the switchboard doors.)

Information #2

A photo is attached. I used a long lens and the image is heavily cropped, so I think it's fair to assume the image is more-or-less orthographic. The background is, of course, 0.1-inch spaced breadboard. My attempts at extracting distances from the photo are given below (with far too many significant figures).

1351.1 px = 1 inch

Head: Pozidrive

Screw length (excluding head)
1014.9 px = 0.751" / 19.1 mm

Screw pitch
460.3 px / 6 = 0.05678" / 1.442 mm (17.6 TPI?)

Screw minor dia (root)
161.4 px = 0.119" / 3.03 mm

Screw major dia (outer threads)
214.2 px = 0.1585" / 4.03 mm

Head dia
423.3 px = 0.3133" / 7.95 mm

Head depth
152.6 px = 0.113" / 2.86 mm

Vgkid:
Looks like a self tapping sheet metal screw.
Have a hardware store near by? Even better, have a local fastener dealer?
Whales:
Yep, I'll double the sheet metal self-tapper.

Best thing to do is walk to Bunnings and compare it with what's on the racks.  Even if you don't want to pay their prices it will let you find the model.  Measuring thread pitches is useless if you don't already know what series the thread is in.

EDIT: also, based solely on that photo, looks like it could be stainless.  Can't be sure from here; but if it's anywhere near water then it might be worth it.
bill_c:
Take a look at www.mcmaster.com for any kind of screw, bolt, bearing, fitting, etc.  Many items they carry have CAD drawing that may help you identify those items.
CatalinaWOW:
Dimensions are very close to a US #8, type A pitch self tapping sheet metal screw.  Don't know how likely that size would be for use in your equipment. 

Sheet metal screws are really only intended to be driven once into a given hole.  They often work for multiple insertions but often you need to go up a size to get the same clamping force.  Unless you are going for a museum level restoration I wouldn't worry about exactly duplicating this screw, just get one with a head that fits and is same or slightly larger major diameter and similar pitch.
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