Differences Between Self-drilling Screws and Self-tapping Screws? Although they may sound similar and have strong resemblances in their physical appearance, self-tapping screws and self-drilling screws should not be confused. The two terms are often used interchangeably, but in fact, these are two different types of screw. Their differences are important when it comes to best uses and most suitable applications, so you should not be tempted to use one in place of the other as this could result in a weaker joint between materials. Self-tapping screws tap their own threads but are unable to drill through materials like a sheet of metal. In this case, self-tapping screws would require a pilot hole. However, self-drilling screws feature a pointed drill bit on the screw, negating the need for a pilot hole as the screw can cut its own thread into the material. These screws are more versatile as they are also able to tap, similarly to self-tapping screws. This makes self-drilling screws highly adaptable and ideal for working with a wider range of materials in different environments and industries.Countersunk self-drilling screws are engineered to be corrosion resistant and come in various sizes and materials. Depending on the size, the applications of the countersunk self-drilling screws can vary - the smaller screws are used in applications like fixing thin gauge metals and fixing metal to wood. The larger screws are used in roofing and other industries which require self-drilling through tough metals. Our screws come in stainless steel, alloy steel, carbon steel and other materials which prevents corrosion. If the counersunk self-drilling screws are used in extremely hard materials, it is advised to use it after a pilot hole has been drilled. Our screws are case hardened and heat-treated for applications requiring fastening of soft materials on hard ones. With a lower installation torque, the threads on these screws allow for a quick transition from drilling to tapping. For effective penetration, make sure that at least three threads of the fastener are inside the material.Countersunk self-drilling screws are a type of screw used in a variety of fastening and fixing applications. they are produced in hardened carbon steel with bright zinc plated surface treatment. It is equipped with countersunk head. Typically made from stainless steel, countersunk self-drilling screws are characterized by their drill-shaped point. This point enables the screws to drill into materials without the need for pre-drilled pilot holes, resulting in a more efficient fastening process. Countersunk self-drilling screws come in a variety of sub types, including different sizes. They are also available both with and without wings, providing a greater degree of flexibility for various projects.

Product name	Cross recessed CSK self-drilling screws
Standard	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc
Size	M2-M24, or non-standard as request&design
Material	Stainless Steel SS201, SS303, SS304, SS316, SS410, SS420
	SteelC45(K1045), C46(K1046),C20,etc
	BrassC36000 ( C26800), C37700 ( HPb59), C38500( HPb58)etc.
	Bronze C51000, C52100, C54400, etc.
	Iron 1213, 12L14,1215,etc.
	Aluminum Al6061, Al6063, etc.
	Alloy steel SCM435,10B21, C1033,etc.
	Carbon steel C1006,C1010,C1018,C1022,C1035K,12L14,etc.
Non-standards	OEM is available, according to drawing or samples