🧩 Product Overview: Brass Hex Socket Cap Screws (M2, M2.5, M3)
If you’re tired of rusty screws or heads that strip the moment you apply torque, these brass hex socket cap head screws are a smart swap. Made for precision work — think restoring vintage electronics, building mechanical keyboards, or securing small parts in marine environments — the M2, M2.5, and M3 metric sizes cover the most common small fastening needs. The cup head (socket cap) design gives you a low-profile, clean look, while the hex-key drive lets you crank down without slipping. Plus, full threading from top to bottom means maximum grip in thin materials or blind holes. Grab a pack and keep your builds solid.
✨ Why Choose These Brass Hex Socket Cap Machine Screws?
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Solid brass construction – Naturally corrosion-resistant, non-magnetic, and great for damp areas, outdoor gear, or any project where steel would rust. Also won’t damage softer materials like plastic or wood.
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Hex socket drive (Allen key) – No Phillips slipping here. The internal hex gives you a positive, cam-out free engagement, so you can apply higher torque without chewing up the head.
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Full thread design – Threads run the entire length of the screw. Perfect for thin panels, tapped holes, or when you need consistent holding power from tip to head.
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Metric sizes M2 / M2.5 / M3 – You get the three most useful diameters for small machinery, 3D printers, RC cars, camera rigs, and electronic enclosure assembly.
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Lengths from 4mm to 30mm – Choose exactly what you need. Short for PCB standoffs, longer for through-hole mounting or sandwiching parts.
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Grade 5 strength equivalent – While brass isn't as hard as steel, these meet Grade 5 standards for moderate-strength applications where rust resistance matters more than extreme tensile load.
📐 Technical Specifications – Brass Hex Socket Cup Head Screws
| Specification |
Details |
| Type |
Machine Screws – Hex Socket Cap Head (Cup Head) |
| Material |
Brass |
| Drive Style |
Hex Key (Allen) – internal hex socket |
| Head Style |
Socket Cap Head / Cup Head (cylindrical with hex recess) |
| Screw Sizes |
M2, M2.5, M3 |
| Thread Size |
M2 x 0.4, M2.5 x 0.45, M3 x 0.5 (metric coarse thread) |
| Thread Type |
Full thread (thread runs entire length) |
| Length Range |
4mm to 30mm (select by option) |
| System of Measurement |
Metric |
| Grade / Strength |
Equivalent to Grade 5 (moderate strength, excellent corrosion resistance) |
| Brand |
Goobetter |
| MPN / Model |
Does not apply (Socket Cap Screws) |
❓ FAQs About Brass Hex Socket Cap Screws (M2–M3)
🔸 Will these brass screws rust or corrode in a marine environment?
Brass is highly resistant to corrosion from moisture and salt spray – much better than plain steel or even some zinc-plated fasteners. For direct saltwater immersion, marine-grade bronze is better, but for boats, dockside equipment, or coastal workshops, these brass screws hold up very well without red rust.
🔸 What Allen key size do I need for M2, M2.5, and M3?
Typically: M2 uses a 1.5mm hex key, M2.5 uses a 2mm, and M3 uses a 2.5mm or 3mm depending on the screw head design (standard socket cap heads for M3 use 2.5mm). A precision hex driver set with metric sizes will cover you perfectly.
🔸 Can I use these brass screws for load-bearing applications?
Brass has good strength for its weight but is softer than steel. These Grade 5 equivalents work well for moderate loads like securing brackets, small machinery guards, or electronic components. For structural or high-torque applications (e.g., engine mounts), stick with steel. These shine where corrosion resistance and aesthetics matter.
🔸 Are these screws fully threaded or partially threaded?
Fully threaded – the threads run the entire length from just under the head to the tip. This is ideal when you need to screw into thin materials or want the maximum number of threads engaging in a shallow hole.
🔸 Do these come with nuts or washers?
They are sold as screws only. However, standard metric brass or steel nuts in M2, M2.5, and M3 are easy to find. The cup head design does not require a washer unless you want to protect a soft surface – a small flat washer can be added separately.
