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

Upgrade your hardware kit with a cost-conscious, ready-to-use fastener set: a USED pack of 20 Inner Hexagon Socket Head Cap Screws with Spring Washers, sized M4. Each piece arrives as an assembly—screw already paired with a spring washer—so you can install quickly in tight spaces where a clean, low-profile mounting is essential.

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  Size and compatibility: M4 thread fits a wide range of metric hardware, enclosures, frames, cabinets, and lightweight assemblies that use standard M4 fasteners.
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  Allen head design: The inner hex socket (Allen) head allows tool access in confined interiors, providing a flush, unobtrusive mounting option.
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  Spring washer for vibration resistance: Each screw arrives with a spring washer to help maintain clamping force and reduce loosening under movement or vibration.
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  Pre-assembled for speed: Since the washer is pre-attached, you can complete assemblies more quickly without juggling separate components.
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  20-piece value pack: A convenient quantity for multi-point assemblies, spare parts, or ongoing projects—without needing frequent repurchases.
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  Used condition: This listing reflects pre-owned hardware; suitable for non-critical or hobby-level applications where cost savings are beneficial.

Typical use scenarios include repairing or building electronics enclosures, assembling DIY projects, outfitting camera or lighting rigs, configuring bike accessories, or securing furniture fittings where a compact, secure fastener is preferred. The combination of an inner hex socket head with a spring washer provides a reliable grip against loosening and a neat, low-profile appearance.

Tips for best results: inspect each piece before use, ensure the screw length matches the material thickness, and use an appropriate hex key for installation. In environments with heavy vibration or high-load requirements, consider pairing these with compatible locking methods to maximize retention.