"unscrew from" is a correct and usable phrase in written English.
You can use it when you are referring to two objects that are connected or attached and one of them needs to be detached. For example, "Carefully unscrew the bolt from the bracket."
Virgin, for example, now sells an MP3 player so small that it can be worn as a necklace, and it is about to introduce a set of portable speakers, for use with any portable music device, that unscrew from a tube that looks like a tennis ball can.
Some models will unscrew from the sink drain while others might have a snap ring.
The filter unscrews from the back for easy cleaning.
The small, two-bedroom apartment is dim: the bulbs have been unscrewed from the overhead lights because Alfred likes to turn them on and off.
Jacques Dallest, a prosecutor, said the artwork appeared to have been unscrewed from the wall, adding, "As far as I know there was no break-in".
"Marinka, what do I do if my license plate has been unscrewed from my car?" "Look through the car," Marina answers gravely.
We see him first haranguing the local hirelings in the Moscow branch - a picture of Lenin is being unscrewed from a wall in one shot - generally kicking their asses and imbuing them with the ethos of the dynamic, beat-the-clock service economy.
In the closed tray technique, the impression copings are retained in the mouth when the set impression is removed, and then, these copings are unscrewed from the mouth and connected to the implant analogs.
Two catalytic converters were unscrewed from two trucks between Friday and Monday, Sgt. Darin Ryburn said, marking the first such thefts police have seen in about two months.
Just weeks before I first met her, Zenteno tells me, her husband discovered that several nuts had been unscrewed from the hood of his car.
It is generally realistic in tone, marked by occasional bursts of surrealism and absurdity, such as Osaka imagining Chiyo's ponytails being "unscrewed" from her head and an episode featuring the characters' New Year's dreams.
