Inner Hexagon Socket Head Screw of M4x20 with Washer

Meet the M4x20 Inner Hexagon Socket Head Screw with Washer — a purpose-built fastener designed to deliver secure, precise assemblies in tight spaces. This compact Allen-head screw combines a clean, low-profile profile with a washer to ensure even clamping and surface protection where it matters most.

The inner hex socket head gives you a reliable, slip-resistant drive in confined areas, so you can tighten confidently with a standard hex key without twisting or cam-out. With a 4 mm thread and a 20 mm length, this screw is ideal for joining thinner panels, chassis, enclosures, and lightweight machinery where a flush finish is essential.

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  Socket head, precise torque transfer: The inner hex design allows accurate tightening in restricted spaces, reducing the risk of rounding or slippage during assembly.
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  Washer included for load distribution: The attached washer spreads clamping force across a broader surface, protecting softer materials from imprinting and helping resist loosening under vibration.
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  Compact, versatile size: M4 x 20 mm is a common size for electronics housings, small fixtures, and DIY projects, making this fastener a dependable default choice.
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  Surface-friendly and reliable: The combination of head shape and washer minimizes surface damage while providing a steady, repeatable grip for future disassembly or re-tightening.

Who needs this fastener? Builders of electronics enclosures, control panels, DIY furniture, automotive interior fittings, and hobbyist projects that require a clean, secure mounting with even load distribution. If you’ve run into pull-through on soft materials or needed a dependable washer-inclusive solution in tight spaces, this M4x20 Inner Hexagon Socket Head Screw with Washer is designed to solve it.

Practical tips for best results: pair the screw with the correctly sized hex key, align components fully before tightening, and use a controlled, incremental turn to reach the desired clamping force. Since the washer is included, you don’t need to search for separate hardware—keep your project streamlined and consistent from start to finish.

Specifications at a glance: M4 thread, 20 mm length, inner hex socket head, washer included. A straightforward, reliable fastener that delivers repeatable performance across a range of applications.