M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel
M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel
M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel
M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel
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M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless SteelM4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless SteelM4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless SteelM4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel

M4 Phillips Truss Head Self Tapping Screw Kit – A2 & A4 Stainless Steel

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🔩 Truss Head Self‑Tapping Screw Kit – A2 / A4 Stainless Steel, Multiple Sizes & Kits

Whether you’re working on metal sheeting, outdoor brackets, or marine‑grade fittings, these truss head self‑tapping screw kits give you the exact sizes and the lasting corrosion protection you need. Each screw features a wide, low‑profile truss head that spreads clamping force to stop pull‑through in thin sheet metal, plastic, and wood. You can choose between A2 (304) stainless steel for excellent everyday weather resistance, or A4 (316) stainless steel – enhanced with molybdenum – for unbeatable performance in saltwater, chemical, and extreme outdoor environments. The kits include a range of lengths across popular M3, M4, and M5 diameters, along with a free screwdriver and screw plugs to get you started right away. Phillips drive gives a secure, cam‑out‑resistant grip, and the sharp self‑tapping thread cuts its own tight mate without a pilot hole in most materials.

⚙️ Key Features – Truss Head Self‑Tapping Screw Kits

  • Wide truss head spreads load and prevents pull‑through in sheet metal, plastic, and wood
  • Material choice: A2 (304) stainless steel for excellent outdoor corrosion resistance, or A4 (316) stainless steel for ultimate saltwater and chemical protection
  • Self‑tapping thread cuts directly into metal, wood, and composites – no pre‑tap required
  • Phillips drive for stable, slip‑resistant fastening
  • Kits available: M3/M4/M5 Mixed A2, M4 A2, or M4 A4 – each with a selection of practical lengths
  • Each kit includes a free screwdriver and screw plugs for immediate installation
  • Smooth, burr‑free threads ensure consistent holding power and easy starting
  • Ideal for metal roofing, automotive trim, marine hardware, furniture, and general outdoor construction

📋 Kit Options & Contents – Truss Head Self‑Tapping Screws

Kit Material Screw Sizes (Diameter × Length) Screw Plugs Free Screwdriver
M3/M4/M5 Mixed A2 Kit A2 (304) Stainless Steel M3×6 (10pcs), M3×10 (10pcs), M3×12 (10pcs), M3×16 (10pcs), M4×12 (10pcs), M4×16 (10pcs), M4×20 (10pcs), M4×30 (10pcs), M5×16 (10pcs), M5×20 (10pcs), M5×35 (10pcs) 20 pcs Yes
M4 A2 Kit A2 (304) Stainless Steel M4×16 (15pcs), M4×20 (15pcs), M4×25 (15pcs), M4×30 (15pcs), M4×35 (15pcs), M4×40 (15pcs), M4×50 (15pcs) 10 pcs —
M4 A4 Kit A4 (316) Stainless Steel M4×16 (15pcs), M4×20 (15pcs), M4×25 (15pcs), M4×30 (15pcs), M4×35 (15pcs), M4×40 (15pcs), M4×50 (15pcs) 10 pcs —

Head dimensions for each size are shown in the product images. Length is measured from under the head. Select your preferred kit from the listing options.

❓ Frequently Asked Questions – Truss Head Self‑Tapping Screws

🔸 What’s the difference between A2 and A4 stainless steel?

A2 (304) stainless is the standard for outdoor, humid, and mildly corrosive environments. It resists red rust effectively. A4 (316) stainless contains extra molybdenum, giving it far superior protection against saltwater, chlorides, and chemical attack. Choose A4 for boat hardware, coastal structures, or chemical plants; A2 is perfect for general roofing, cladding, and damp‑location use.

🔸 Do I need a pilot hole before driving these screws?

In thin sheet metal (up to 1.5 mm), soft plastics, and wood, you can usually drive directly. For thicker steel or very hard materials, a pilot hole about 80% of the thread diameter reduces driving torque and ensures the cleanest thread.

🔸 How does the truss head help compared to a standard pan head?

The truss head has a wider, flatter bearing surface that spreads the clamping pressure over a larger area. This stops the screw from pulling through thin or soft materials and often eliminates the need for a separate washer.

🔸 What Phillips bit size should I use for these screws?

It depends on the screw diameter: M3 and M3.5 use a #1 Phillips bit, while M4, M5, and M6 use a #2 Phillip bit. A sharp, unworn bit prevents cam‑out and keeps the head recess in good shape.

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