不同材料选择正确螺丝的完整指南。解释木螺丝、机螺丝、混凝土锚和塑料紧固件。
螺丝与材料匹配
为每种材料使用正确的螺丝确保安全紧固、防止损坏并使安装高效。错误的螺丝会导致脱扣、弱接头和组装失败。
木螺丝
木螺丝设计用于将木材固定在木材或其他材料上：螺纹设计-粗牙带尖点；头型-平头、圆头、胶合板头；材料-碳钢、不锈钢、黄铜；导孔-硬木必需，防止分裂。
机螺丝和自攻螺丝
机螺丝需要预攻丝孔或螺母。自攻螺丝分螺纹成型和螺纹切割两种。钻孔能力-自攻螺丝（TEK螺丝）结合钻孔和固定。非洲建筑中自攻螺丝广泛用于IBR屋顶和钢框架。
混凝土和砖石锚
混凝土锚必须抓握住不会弯曲的基材：膨胀锚-螺栓紧固时套筒或楔块膨胀；粘合锚-环氧树脂或聚酯树脂将锚粘合到混凝土；混凝土螺丝-实际切割螺纹进入混凝土；安装-始终使用适当的混凝土钻头预钻孔。
塑料用紧固件
塑料材料带来独特的紧固挑战：螺纹设计-太粗有破裂风险，太细则减少拉出强度；塑料螺丝-欠切根半径和控制螺纹深度防止应力集中导致破裂；插入螺母-黄铜或不锈钢插入件在塑料中提供耐用螺纹；紧固扭矩-塑料紧固件需要比金属更低的扭矩。
常见问题
See frequently asked questions below.
What's the difference between wood screws and drywall screws?
Drywall screws have fine threads for holding drywall to steel or wood studs. They are brittle and can snap under stress. Wood screws have coarse threads for wood-to-wood connections and are more ductile.
Can I use wood screws in metal?
No - wood screws are not designed for metal. Use machine screws or self-tapping screws for metal connections.
What size pilot hole for wood screws?
Match the hole to the screw's core diameter (before threads). For hard woods, use a slightly smaller hole. For soft woods, the full core diameter is fine.
How do I anchor into brick instead of concrete?
Use sleeve anchors or brick anchors specifically rated for masonry. Standard concrete anchors may not hold in brick. Check that your anchor is approved for the specific brick type.
What's the best screw for outdoor decking in Africa?
Stainless steel (A4/316) deck screws or hot-dip galvanized screws. Coarse thread for hardwoods. Spacing should account for wood movement with humidity changes.