Wood screw threads

I've been going crazy trying to remember what they're called.....

Hanger Bolts!

Hanger Bolts | Fastenal

Hanger bolts have threaded areas at both ends: a lag screw thread at one end and machine screw thread on the other. They are designed for insertion into a pre-drilled hole and are ideal for overhead applications, such as suspending electrical wiring or sheet metal from wooden structures.
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Reading this I couldn't remember where I've seen these then remembered on Queen Ann wood table legs !
 
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