This used M4x8 hex cylindrical head screw is a compact, dependable fastening solution built for tight spaces and precise assemblies. With a 4 mm diameter and 8 mm length, it fits shallow holes and constrained racks where larger fasteners simply won’t do.

• Size and fit: M4 diameter, 8 mm long, a versatile choice for small enclosures, electronics housings, and lightweight machinery assemblies.
• Head type and drive: cylindrical head paired with a hex (Allen) drive delivers strong torque in confined gaps while maintaining a clean, low-profile profile in visible or panel-mounted applications.
• Condition: listed as used, offering economical value for projects where components aren’t exposed or where a like-new appearance isn’t required.
• Ideal use cases: electronics enclosures, DIY robotics frames, 3D printer assemblies, furniture repairs, and other small-scale mechanical builds that require reliable M4 threading.
• Installation notes: insert into a tapped M4 hole or with a compatible nut, use a hex key to achieve the desired torque, and verify threads are clean before reuse to avoid cross-threading.

Why this screw stands out for your projects: the cylindrical head provides strong bearing surface and a tidy look in recessed pockets, while the hex drive ensures solid engagement even in cramped workspaces. Choosing a used M4x8 hex cylindrical head screw gives you dependable performance at a practical price, perfect for hobbyists, repair tasks, or bulk inventory for ongoing projects.

When precision matters—whether you’re fabricating a compact robot chassis, mounting a sensor module, or reinforcing a small enclosure—this screw delivers reliable clamping and repeatable results. Add it to your toolkit and pair with matching fasteners and tolerant threaded holes for optimal performance.