How big are the special screws for Hongta aluminum windows and doors

And 4 × 8, 4 × 12 on the wheels and some handle locks; splicing part is 4 × 50 or 4 × 60, according to the actual thickness of the profile to choose. Installation of the expansion tube is 8 × 80, 8 × 100 and special lengthening of 8 × 160, 8 × 200 but this is generally not used.

Screws are the use of the object's oblique circular rotation and friction physics and mathematical principles, step-by-step tightening of the instrumental parts of the tool. Screw is a generic term for fasteners, an everyday verbal term. Screws for daily life in the indispensable industrial necessities: such as cameras, eyeglasses, clocks and watches, electronics, etc., the use of very small screws; television, electrical products, musical instruments, furniture, etc., general screws; as for engineering, construction, bridges, then the use of large screws, nuts; transportation appliances, airplanes, trolley buses, automobiles, etc., is the size of the screws and use.