🔩 Product Overview: Socket Head Cap Screws – Carbon Steel with Titanium Coating (M2 to M5)
These socket head cap screws combine the strength of high‑quality carbon steel with an attractive titanium‑coated finish. The coating provides a layer of corrosion and rust resistance, making them suitable for indoor applications where a sleek, dark metallic look is desired. The internal hex drive (Allen key) allows for positive engagement and high torque without cam‑out. Available in metric sizes M2, M2.5, M3, M4, and M5 – perfect for machinery, furniture, 3D printers, and DIY projects. Note that the titanium coating is a surface treatment; if the coating is scratched or peels off, the exposed carbon steel may rust. For wet or outdoor environments, we recommend stainless steel instead.
✨ Why Choose Titanium‑Coated Carbon Steel Socket Head Screws
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High‑quality carbon steel core – Offers good strength and durability for general fastening applications in manufacturing and furniture.
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Titanium‑coated surface – Provides an attractive dark metallic finish with added corrosion and rust resistance. (Note: Rust may occur if the coating is damaged or peels off.)
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Hex socket (Allen) drive – Internal hex allows high torque transmission without cam‑out. Ideal for precision tightening and removal.
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Metric sizes M2, M2.5, M3, M4, M5 – Covers the most common small diameters for electronics, 3D printers, RC vehicles, and furniture assembly.
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Fully threaded, coarse metric pitch – Standard threads: M2x0.4, M2.5x0.45, M3x0.5, M4x0.7, M5x0.8. Threads run the entire length for maximum grip.
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Length measured under the head – Consistent with socket cap screw standards. Example: M4 x 16mm = 16mm thread length below head.
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Wide application range – Manufacturing, furniture decoration, 3D printers, machinery, and light industrial assemblies.
📏 Technical Specifications – Titanium‑Coated Socket Head Cap Screws (M2–M5)
| Specification |
Details |
| Product Type |
Socket Head Cap Screws (Hex socket / Allen drive) |
| Base Material |
Carbon steel |
| Surface Coating |
Titanium coating (dark metallic finish) |
| Corrosion Resistance |
Coating provides moderate protection; exposed steel will rust if coating is scratched or peeled |
| Drive Style |
Hex key (Allen) – internal hex socket |
| Head Style |
Cylindrical socket cap head (low profile) |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M2, M2.5, M3, M4, M5 |
| Thread Pitches (coarse) |
M2x0.4, M2.5x0.45, M3x0.5, M4x0.7, M5x0.8 |
| Thread Type |
Fully threaded |
| Length Measurement |
Under head – from flat bearing surface to tip (head not included) |
| Finish |
Titanium coated (dark / rainbow-ish sheen depending on lighting) |
❓ FAQs – Titanium‑Coated Socket Cap Screws
🔸 How durable is the titanium coating? Will it peel off?
The titanium coating is a surface treatment that bonds to the carbon steel. It is reasonably durable under normal installation and use. However, if the screw is overtightened, scratched by a tool, or subjected to abrasion, the coating can be damaged. Once the coating is compromised, the exposed carbon steel will rust when exposed to moisture. For applications where the coating may be scratched, consider stainless steel fasteners.
🔸 Are these screws suitable for outdoor use or wet environments?
Not recommended. While the titanium coating offers some rust resistance, it is not as robust as stainless steel. Any scratch or chip will expose carbon steel, leading to rust. For outdoor, marine, or high‑humidity applications, use A2 or A4 stainless steel socket head screws instead.
🔸 What hex key (Allen wrench) size do I need for M2 through M5?
Standard hex key sizes: M2 uses 1.5mm, M2.5 uses 2mm, M3 uses 2.5mm, M4 uses 3mm, M5 uses 4mm. A precision metric hex key set (1.5–4mm) will cover all these sizes.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head to the tip, not including the head. For example, an M4 x 16mm screw has a 16mm threaded shank.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching metric nuts (M2–M5) or in pre‑tapped holes. For best results, use carbon steel or stainless nuts. Avoid over‑tightening to prevent coating damage.
🔸 What lengths are available for M2 to M5?
Lengths vary by diameter – typical ranges: M2: 4–12mm, M2.5: 5–16mm, M3: 6–20mm, M4: 8–25mm, M5: 10–30mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.
