自攻螺丝完整指南：304不锈钢、镀锌、盘头、钻尾、外墙保温自攻螺丝。工厂批发价。
What Are Self Tapping Screws?
自攻螺丝在安装时在母材中创建自己的配合螺纹，无需预钻或攻丝。
304 Stainless vs Carbon Steel Self Tapping Screws
304不锈钢自攻螺丝为户外、海洋和化学环境提供优异的耐腐蚀性。
Pan Head vs Washer Head Self Tapping Screws
盘头自攻螺丝具有低圆形头部和大支撑面，适合固定薄金属板或塑料部件。
Self Tapping Screws for Exterior Wall Insulation and Color Steel Roof
对于外墙保温系统（EIFS, ETICS），专用长自攻螺丝配合大塑料垫圈用于将保温板固定到基层。
Self Locking and High Strength Self Tapping Screws
自锁攻丝螺丝具有锯齿螺纹或法兰设计，提供额外的抗振动松动阻力。
Self Tapping Screw Selection Guide
| Type | Drive | Head | Material | Best Application |
|---|---|---|---|---|
| Type AB (Fine-Coarse) | Phillips/Pozi | Pan/Flat/Oval | CS ZP, SS 304/316 | Sheet metal, plastics |
| Type B (Coarse) | Phillips/Pozi | Pan/Truss | CS ZP, SS 304/316 | General purpose, dry wall |
| Self Drilling #2 | Hex/Phillips | Washer Head | CS ZP, SS 410 | Roofing, cladding, steel up to 2.3mm |
| Self Drilling #3 | Hex/Phillips | Washer Head | CS ZP, SS 410 | Roofing, cladding, steel up to 4.0mm |
| Self Drilling #4 | Hex/Phillips | Washer Head | CS ZP, SS 410 | Thick steel, structural connections |
| Insulation Screw | Phillips | Large Plastic Disc | CS ZP, SS 304 | Exterior insulation boards |
Frequently Asked Questions
自攻螺丝和自钻螺丝有什么区别？
自攻螺丝需要预钻导孔；螺丝只形成螺纹。自钻螺丝有内置钻头，一步完成导孔和螺纹。
彩钢屋面螺丝用多大EPDM垫圈？
屋面标准EPDM垫圈是15mm内径×4mm厚×35mm外径，用于M6螺丝。
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