Product Details

This product is a national standard self-cutting screw for doors and windows, specifically designed for aluminum alloy, PVC, and steel structure door and window frames. Its key feature is its self-cutting thread design, eliminating the need for pre-tapping and allowing for direct tightening. Made from high-quality carbon steel through multiple processes including cold heading, heat treatment hardening, precision thread rolling, galvanizing for corrosion protection, and cross-grooving, the screw features sharp, clear self-cutting threads with no burrs and a precise cross-grooving head. The screw can directly cut into the profile holes of aluminum alloy, PVC, and steel structure doors and windows, creating a secure, non-loosening thread that effectively resists vibrations from opening and closing. The surface is electro-galvanized for corrosion protection, offering rust prevention and an attractive appearance, suitable for both indoor and outdoor door and window installations. Each batch undergoes hardness and thread precision testing, ensuring stable quality and a complete range of specifications. It is an essential screw for door and window installation and the fastening of steel structure door and window frames.

Core Technical Parameters

Material: High-quality carbon steel
Surface Treatment: Electro-galvanized
Specifications: M4.2, M4.8, M5.5 (Length 16mm-35mm, standard stock available)

Core Application Scenarios

Aluminum alloy door and window frame fastening, PVC door and window splicing and installation, steel structure door and window frame fixing, door and window hinge connection, screen frame fixing, sunroom aluminum alloy frame locking

Compatible Standards & Recommended Accessories

Execution Standard: National Standard GB/T 15856.2
Recommended Accessories: No additional accessories (directly cut and used; installation only requires a Phillips screwdriver)