Odd fastener

[diver dave]

I know this group knows…
There are some flat head machine screws on board, that have a plain head, that is, not designed for a driver. Any idea what these are called, so i can do a supplier search?
If you are wondering, the heads are visible on the seats of chairs. So, a perfectly flat, bur-less install.

 

[O C Diver]

Ring nails?

Ted

 

[diver dave]

M5 machines screws with lock nuts

I have never seen such a thing.

 

[FBoykin]

Can you get a better photo??

View attachment 125915

M5 machines screws with lock nuts

I have never seen such a thing.

 

[diver dave]

 

[diver dave]

 

[diver dave]

I need a French equivalent of a mc master carr.
Flat head. Totally featureless.

 

[Capn Craig]

What’s on the other side? If there were nuts wouldn’t they be in the seating area and at least uncomfortable? Perhaps they are rivets, and not intended to be removed.
This is edited: I just saw the other photo, I’m guessing that the head of the fastener is on the butt-side of the seat. Why not remove the nuts and find out. Without a means to hold the head it might turn but an impact will help.

 

[O C Diver]

Is it splined ( for maybe 1/4") where the splines bite the wood and tightening the nut pulls everything tight?

Ted

 

[diver dave]

Not splined. Very conventional fully threaded. Conventional head also, except no feature to take a driver.

 

[diver dave]

Not splined. Very conventional fully threaded. Conventional head also, except no feature to take a driver.

Guessing these designers wanted something not ever to snag clothing.

 

[Bacchus]

Flat Head Carriage bolt... they come spliced or square.

https://www.rocheindustry.com/carriage-bolts/flat-head-carriage-bolts/

Also elevator bolts fairly common but may be hard to find SS and metric?

 

[HopCar]

Elevator bolt? I see Bacchus beat me to it.

 

[diver dave]

Flat head carriage bolt. I do believe thats it. Thanks!

 

[RickyD]

Not splined. Very conventional fully threaded. Conventional head also, except no feature to take a driver.

So when you turn the nut, the head turns also?

 

[diver dave]

I realize now that i did not pull one out yet. There are a few phillip head substitutes i am trying to purge.