How to choose the right screw

Choosing the right screw for the right occasion requires comprehensive consideration of factors such as materials, functions, environment, and load. The following is a systematic selection guide to help you quickly match screws with usage scenarios:

I. Core selection factors
1. Material matching
Metal parts connection:

Light metal (aluminum/aluminum alloy): Select stainless steel A2/A4 or aluminum screws to prevent electrochemical corrosion

Steel: 8.8 grade and above carbon steel galvanized screws (such as color-coated zinc, Dacromet)

Non-metal parts connection:

Plastic/wood: coarse-thread wood screws or self-tapping screws with cutting grooves (such as Type AB)

Composite materials: double-thread screws (high and low thread design to prevent loosening)