Inner Hexagon Socket Head Cap Screw and Spring Washer Assembly-M4 * 20

Meet a compact, ready-to-use fastening solution designed for clean, reliable assemblies: the Inner Hexagon Socket Head Cap Screw and Spring Washer Assembly in M4 size, 20-pack. This combo brings together precise screws and built-in spring washers to deliver secure holds in vibration-prone environments and tight spaces.

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  One-step hardware kit: Each M4 inner hex socket head cap screw arrives already paired with a spring washer; no guessing, no separate parts to source.
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  Secure, vibration-resistant fastening: The accompanying spring washer applies preload and anti-loosening tension to keep joints tight even under dynamic loads.
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  Flush, low-profile drive: The compact socket head sits neatly in crowded assemblies, reducing protrusion while maintaining robust engagement with the hex key.
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  Versatile M4 sizing: Ideal for electronics, robotics, 3D printer builds, and small machinery—anywhere a strong, compact fastener is needed.
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  20-piece set for ongoing projects: Stock up so you’re never short on essential screws for assemblies, repairs, or prototyping.

Use cases range from securing panels on compact equipment and mounting sensors on a drone frame to attaching brackets on micro enclosures or replacing worn fasteners in hobby projects. The inner hex socket delivers a secure drive in tight spaces, while the spring washer helps preserve clamping force through temperature changes and micromovements.

Installation tips: select the appropriate hex driver for M4 screws, ensure threads are clean, and apply torque appropriate to your material and joint. This 20-piece set is designed to work with standard M4 threaded components and compatible washers, offering a practical, ready-to-use solution for fast, reliable assembly.