🔩 Socket Cap Head Self‑Tapping Screws – A2 Stainless Steel (M2, M2.5, M3, M3.5, M4, M5, M6) When space is tight and you need a fastener that won’t round out, these A2 / 304 stainless steel socket head self‑tapping screws deliver. The internal hex drive lets you apply more torque than a Phillips or slotted screw without cam‑out, making them perfect for machinery panels, electronics enclosures, and automotive brackets. The sharp self‑tapping thread cuts its own path into sheet metal, plastic, wood, and fiberglass — no pre‑tapped hole needed. Made from genuine 304 stainless, they offer permanent corrosion resistance for indoor, outdoor, and damp environments without a surface coating to wear off. Covering seven metric diameters from M2 to M6 and lengths from 6 mm to 50 mm, this series gives you the strength and control you need for precision assembly and repair. ⚙️ Key Features – A2 Stainless Socket Head Self‑Tapping Screws Genuine A2 / 304 stainless steel — provides permanent corrosion resistance without plating in wet, humid, and outdoor use Hex socket cap head (internal hex drive) withstands higher tightening torque and virtually eliminates cam‑out compared to Phillips heads Self‑tapping thread cuts into sheet metal, wood, plastic, and composites — no pre‑tap or pilot hole needed in most thin materials Available in seven definitive diameters: M2, M2.5, M3, M3.5, M4, M5, M6 — with all lengths listed for each size Precision‑rolled, burr‑free threads ensure consistent holding power and prevent damage to sensitive assemblies Natural stainless finish — no coating to chip or peel, stays clean and non‑magnetic Ideal for enclosures, pumps, electrical equipment, chemical plants, shipboard hardware, and high‑humidity installations 📋 Technical Specifications – Socket Cap Self‑Tapping Screws 304 Size Thread Diameter (d) Available Lengths (mm)* Head Style Drive (Hex Key) Material & Finish M2 2.0 mm 6, 8, 10, 12 Socket Cap Hex 1.5 mm A2 304 Stainless, Plain M2.5 2.5 mm 6, 8, 10, 12, 14, 16 Socket Cap Hex 2 mm A2 304 Stainless, Plain M3 3.0 mm 6, 8, 10, 12, 14, 16, 20, 25 Socket Cap Hex 2 mm A2 304 Stainless, Plain M3.5 3.5 mm 10, 12, 15, 20, 25, 30 Socket Cap Hex 2.5 mm A2 304 Stainless, Plain M4 4.0 mm 10, 12, 14, 16, 20, 25, 30, 35, 40, 50 Socket Cap Hex 2.5 mm A2 304 Stainless, Plain M5 5.0 mm 16, 20, 25, 30, 35, 40, 50 Socket Cap Hex 3 mm A2 304 Stainless, Plain M6 6.0 mm 16, 20, 25, 30, 35, 40, 50 Socket Cap Hex 4 mm A2 304 Stainless, Plain * Lengths are thread length only (measured from under the head). Each diameter has the exact lengths listed above — choose from the listing variations. Hex key sizes are indicated for each diameter. All screws are fully threaded. ❓ Frequently Asked Questions – Socket Head Self‑Tapping Screws 🔸 What hex key size do I need for each screw diameter? M2 uses a 1.5 mm hex key, M2.5 and M3 use 2 mm, M3.5 and M4 use 2.5 mm, M5 uses 3 mm, and M6 uses a 4 mm hex key. A standard metric hex set will cover all sizes. 🔸 Can I drive these screws without a pilot hole in sheet metal? In thin sheet metal up to about 1.2 mm you can often drive them directly. For thicker steel, hard plastics, or dense wood, a pilot hole about 80% of the thread diameter makes driving easier and gives you the strongest, cleanest thread. 🔸 Will 304 stainless really hold up in humid or salt‑air environments? Yes. 304 stainless is the industry standard for outdoor and marine‑above‑waterline fasteners. It won’t red‑rust like carbon steel. For permanent saltwater submersion, 316 would be even better, but for pumps, electrical enclosures, and coastal applications, 304 performs very well. 🔸 Are the lengths shown including the head? No. All listed lengths are the thread length only, measured from directly under the socket cap to the tip. The head height is additional, so you can accurately match the screw to your material thickness. 🔸 Are these screws magnetic? 304 stainless is generally non‑magnetic in the annealed state. Some sizes may pick up a very weak magnetic response after cold working, but it’s negligible compared to standard steel. 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