No, it is not recommended to be used for a king bed frame.
The hanger bolts can be screwed out of the wood up to 1/4 inch without sacrificing strength. If you need more length, longer hanger bolts can be purchased at Home Depot.
Yes, the plate that attaches to the base of furniture is purchased separately
It protrudes approximately 3/8". It can be screwed out another 1/4" or so without compromising strength, or you could easily replace it with another, longer hanger bolt.
These are supplied with an installed hanger bolt threaded 5/16-18. The hanger bolt can be removed and replaced with the next larger size, 3/8-16, without any additional drilling. For a larger size, you would have to re-drill the hole.
The total length of the screw is 1-1/2"
can these replacement be paint black, and if the job be done by you. is a tv console, needs 6 pcs
an inch and a half