🔒 Product Overview: M3–M5 Torx Socket Head Cap Screws (A2 Stainless Steel)
If you’re tired of Phillips heads stripping or hex keys camming out under torque, these Torx drive socket cap screws are a serious upgrade. The star-shaped Torx recess gives you full contact engagement – no slipping, no damaged bits. Made from A2 (304) stainless steel, they resist rust and look clean on machinery, outdoor gear, or security-sensitive equipment. The cylindrical head sits flush in counterbored holes, and the M3, M4, and M5 metric sizes cover everything from 3D printer frames to motorcycle parts. Plus, the Torx pattern adds a layer of “security” – casual passersby won’t have the right bit to remove them.
✨ Why Choose Torx Socket Head Cap Screws in A2 Stainless?
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Torx drive for superior torque transfer – The six-lobe star design eliminates cam-out. You can apply higher torque without rounding the recess – a lifesaver for stubborn or loctite-fastened bolts.
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A2 (304) stainless steel construction – Excellent corrosion resistance for indoor and outdoor use. Won’t rust or stain like plain steel. Great for marine, kitchen, and architectural applications.
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Cylinder / socket cap head – Clean, cylindrical profile fits standard counterbored holes. Provides a large bearing surface and a professional, low-profile appearance.
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Metric sizes M3, M4, M5 – The most common diameters for small machinery, electronics enclosures, bicycle parts, and DIY fixtures. Lengths vary – check the size chart.
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Inherent security feature – Torx bits are less common than Phillips or hex in household toolboxes. Using these screws makes casual tampering or accidental removal less likely – ideal for public installations or children’s equipment.
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A2-70 strength grade – Tensile strength of 700 N/mm². Strong enough for structural fastening in aluminum, plastic, and mild steel assemblies.
📏 Technical Specifications – Torx Socket Head Cap Screws (M3–M5)
| Specification |
Details |
| Product Type |
Torx Socket Head Cap Machine Screws / Security Bolts |
| Material |
A2 Stainless Steel (304 / 18-8) |
| Head Style |
Cylinder Head / Socket Cap Head (for counterbored holes) |
| Drive Style |
Torx (six-lobe star drive) |
| Thread Diameters |
M3, M4, M5 |
| Thread Pitch (coarse) |
M3x0.5, M4x0.7, M5x0.8 |
| Length Measurement |
Length excludes head – from under-head to tip (e.g., M3x10 = 3mm diameter, 10mm thread length) |
| System of Measurement |
Metric |
| Finish |
Natural stainless steel (no additional plating) |
| Grade |
A2-70 (700 N/mm² tensile) |
| Packing |
Plastic bag / Carton box |
| Note |
Dimensions manually measured – small tolerances possible. Refer to actual product. |
❓ FAQs – Torx Socket Cap Screws (M3/M4/M5 A2 Stainless)
🔸 What Torx bit size do I need for M3, M4, and M5 screws?
Typically: M3 uses T10, M4 uses T20, and M5 uses T25. Always check fit – a slightly too small bit can still damage the recess. A good quality Torx bit set (T6 to T30) will cover all these.
🔸 Are these screws truly “security” screws?
They offer a basic level of security because Torx drivers are less common than Phillips or flathead in average households. However, standard Torx bits are widely available. For higher security (tamper-proof), look for Torx with a center pin. These are great for deterring casual tampering on things like park benches, playground equipment, or outdoor signs.
🔸 Can I use these screws outdoors?
Absolutely – A2 (304) stainless is highly resistant to rain, humidity, and even mild salt spray. For direct saltwater immersion (boat hulls, docks), 316 stainless is better, but for general outdoor use like fences, grills, or garden furniture, these work great.
🔸 Are these screws fully threaded or partially threaded?
They are fully threaded from just under the head to the tip – standard for socket cap screws in these metric sizes. Full threading gives you maximum grip in thin materials and allows for precise clamping.
🔸 Will these screws rust or stain if used in a kitchen or bathroom?
No – 304 stainless steel is commonly used in kitchen appliances, sinks, and bathroom fixtures. It resists water, steam, and mild cleaning chemicals. Just avoid prolonged contact with strong chlorides (bleach, pool chemicals) which can cause pitting over time.
🔸 Do you offer matching nuts or washers?
These are sold as screws only. However, standard metric stainless steel nuts (M3, M4, M5) are widely available. For a complete fastening kit, you can pair with stainless flat washers and lock washers separately.
