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It has a very flat head, like a pan head but the top is flat, and very thin. Probably metric because the parts lists calls it a m27-1.5 inches long. The point if flat.

The screw is to hold a slider metal bar on a porch swing into an upright made out of Trex.

Any name so I can source some?

4 or 5 mm hex drive, not that it matters.
Not sure about the name but I would look up deck screws
The head type could be listed as truss or wafer. Socket drive.
Cap-Tor   (maybe)
Looks like a pocket hole screw to my non-expert eye. Check McFeeley's
Not sure about your screw but how about this? https://www.mcmaster.com/screws/tapping-...r-plastic/
(09-11-2020, 08:39 PM)sroxberg Wrote: [ -> ]It has a very flat head, like a pan head but the top is flat, and very thin. Probably metric because the parts lists calls it a m27-1.5 inches long. The point if flat.

The screw is to hold a slider metal bar on a porch swing into an upright made out of Trex.
https://shopee.com.my/M5-M6-Button-Head-...1695973761

4 or 5 mm hex drive, not that it matters.

Might be a button head screw. Closest I've come is here: https://shopee.com.my/M5-M6-Button-Head-...1695973761
The threads look very similar to those used for particle board or MDF. Closest I can come up with a a truss head deck screw.
(09-13-2020, 06:09 PM)AHill Wrote: [ -> ]The threads look very similar to those used for particle board or MDF.  Closest I can come up with a a truss head deck screw.

That’s my impression.  A thick wafer head screw, for particle board.
(09-11-2020, 08:39 PM)sroxberg Wrote: [ -> ]It has a very flat head, like a pan head but the top is flat, and very thin. Probably metric because the parts lists calls it a m27-1.5 inches long. The point if flat.

The screw is to hold a slider metal bar on a porch swing into an upright made out of Trex.

Any name so I can source some?

4 or 5 mm hex drive, not that it matters.

https://www.homedepot.com/p/Everbilt-7-m.../204273733

Wafer head socket cap screws, usually called connecting screws. Common in flat pack furniture and outdoor DIY playgrounds.