This glossary provides an overview of common screws and fasteners, highlighting their designs, features, and applications. From self-drilling and self-piercing screws to tapping and thread cutting options, each entry explains how these fasteners work and where they’re most effective. Use this guide to better understand the right screw for your project needs.
Self-Drilling Screws
Self-drilling screws combine a drill bit and a screw in one fastener, eliminating the need for pre-drilling. Designed to cut through metal and other materials, they save time and increase efficiency in construction and manufacturing. Their built-in drilling tip ensures a secure, tight fit while reducing installation steps.
Hex Washer Self-Drilling Screws
Hex washer self-drilling screws feature a hexagonal head with an integrated washer, providing excellent driving power and holding strength in metal-to-metal applications.
Hex Washer Self-Drilling Screws with EPDM Bonded Sealing Washers
Hex washer self-drilling screws with EPDM bonded sealing washers include an added EPDM washer that creates a watertight seal, making them ideal for roofing, siding, and outdoor projects where weather resistance is essential.
Phillips Pan Self-Drilling Screws (Rounded Head)
Rounded head Phillips pan self-drilling screws come with a rounded, low-profile pan head and Phillips drive, offering a clean appearance while providing reliable fastening in lighter-gauge materials.
Phillips Flat Self-Drilling Screws (Countersunk)
Countersunk Phillips flat self-drilling screws are designed with a flat, countersunk head that sits flush with the surface, these screws are commonly used when a smooth, finished look is desired.
Square Drive Pan Self-Drilling Screws (For Secure Fit)
Square drive pan self-drilling screws provide extra torque and reduced cam-out with their square drive, making them a great choice for applications requiring secure, consistent fastening.
Phillips Modified Truss Self-Drilling Screws (K-Lathe; Wafer Truss Head)
Phillips modified truss self-drilling screws feature an oversized, low-profile head with a large bearing surface, ideal for securing thin materials without pull-through.
Phillips Pancake Self-Drilling Screws (Clip Screws; Low Profile)
Phillips pancake self-drilling screws have an extra-low pancake-style head, designed for use with clips and brackets where clearance is limited.
Self-Piercing Screws
Self-piercing screws are engineered to penetrate thin sheet metal and other materials without pre-drilling or pilot holes. Their sharp point cuts through surfaces on contact, making them fast and efficient for HVAC, automotive, and construction applications.
Hex Washer Self-Piercing Screws
Hex washer self-piercing screws offer a strong hold with a hex head design, providing stability and driving efficiency during installation.
Hex Washer Self-Piercing Screws with EPDM Bonded Sealing Washers
Hex washer self-piercing screws with EPDM bonded sealing washers include a sealing washer for added protection against leaks, making them well-suited for outdoor or moisture-prone environments.
Phillips Pancake Self-Piercing Screws (Architectural Clip Screws; Low Profile)
Phillips pancake self-piercing screws feature a slim pancake head for a neat finish, commonly used for attaching architectural clips and trim.
Tapping Screws
Tapping screws are versatile fasteners that form their own threads as they are driven into metal. Available in many head styles and drive types, they provide strong fastening without the need for pre-threaded holes, making them widely used in construction, electrical, and general-purpose applications.
Thread Cutting Screws
Thread cutting screws cut and remove material as they create internal threads in pre-drilled holes. Unlike tapping screws, they generate cleaner, more precise threads and reduce stress on the material, making them a good option for harder metals and plastics.
Indented Hex Washer Thread Cutting Screws
Indented hex washer thread cutting screws provide a high-strength fastening solution with a hex washer head, offering excellent torque and load distribution.
Phillips Flat Head Cutting Screws
Phillips flat head cutting screws sit flush with the surface after installation, making them a good choice when a smooth, finished appearance is required.
Phillips Pan Thread Cutting Screws
Phillips pan thread cutting screws feature a rounded pan head and Phillips drive, offering reliable fastening for a variety of metal and plastic applications.
Slotted Pan Thread Cutting Screws
Slotted pan thread cutting screws come with a traditional slotted drive and rounded head, providing easy installation and versatile use in many assemblies.