400PCS M4 Socket Head Cap Screw Assortment Kit, 6-30mm - size: M4

About this item

• 400 PCS M4 Metric Screw Kit — This M4 screw assortment kit is designed for 3D printing, electronics, RC models, CNC machinery, chair repairs, and DIY projects, providing reliable fastening performance for detailed and intricate assemblies.
• Standardized M4 Metric Specifications — Includes 8 commonly used lengths: M4 x 6mm / 8mm/ 12mm / 16mm / 20mm / 25mm / 30mm. Plus 1pcs mini wrench.Manufactured to strict metric standards with average dimensional tolerance under 0.01mm, ensuring precise fit and smooth installation.
• Premium 12.9 Grade Alloy Steel — These M4 Allen head screws deliver exceptional hardness, strength, and load-bearing performance. Designed to resist wear, deformation, and corrosion, making them reliable for high-stress and demanding environments.
• Clean & Rust-Proof Finish — Black zinc plated for oil-free handling, keeping hands and workpieces clean. Provides enhanced rust resistance for long service life, suitable for indoor and outdoor projects alike.
• Labeled Compartment Storage Case — All bolts, nuts, and washers are neatly organized in a durable, clearly labeled case, allowing quick size identification, reduced loss, and a cleaner workspace—saving time and improving efficiency on every project.

Overview

• Size: M4
• Color: Black
• Material: Alloy Steel
• Brand: Screwish
• Fastener Type: Hex