Gypsum screw, also known as a drywall screw, is a type of fastener specifically designed for attaching gypsum board (drywall) to wooden or metal framing.

Gypsum screws, also known as drywall screws, are specialized fasteners primarily used to attach gypsum board (drywall) to wooden or metal framing. Their design with fine threads and a bugle head helps prevent damage to the drywall paper during installation. They are crucial for creating strong, stable, and seamless interior walls and ceilings. 

Purpose:
Securing Drywall:
The main function of gypsum screws is to securely fasten drywall panels to studs (either wood or metal). 
Preventing Damage:
The fine threads and bugle head of drywall screws are designed to minimize damage to the drywall paper during installation, ensuring a clean and smooth finish. 
Key Features:
Fine Threads:
Drywall screws have a fine thread pattern, which is crucial for gripping into the thin gypsum core of the drywall without causing it to crumble. 
Bugle Head:
The bugle (or countersunk) head allows the screw to sit flush with the drywall surface, preventing it from protruding and interfering with the finishing process (taping and mudding). 
Corrosion Resistance:
Many drywall screws have a phosphate coating to protect them from corrosion, especially important when used in indoor environments where moisture might be present. 
Applications:
Interior Walls and Ceilings:
Drywall screws are essential for building interior walls and ceilings in residential and commercial construction.
Partition Walls:
They are also used to construct partition walls, which divide spaces within a building.
Other Carpentry and Construction:
In addition to their primary use with drywall, these screws can be used for other carpentry and construction tasks involving paneling, drywall to wood or metal framing, and more.