Unknown type of fastener

[samvanwesen]

Has anyone seen one of these before, or are do you think they are made to order? I have been looking over several DIN and ASME standards, but do not find them.

Thanks!

 

[3DDave]

Picture? You need to paste the link after uploading the file.

 

[klaus.]

nothing to see

 

[Tmoose]

"My last login was on Wednesday, November 27, 2019."

Still on holiday, perhaps.