{"product_id":"680pcs-m4-socket-head-bolts-assortment-kit-m4x6-8-12-16-20-30mm-screw","title":"680PCS M4 Socket Head Bolts Assortment Kit, M4x6\/8\/12\/16\/20\/30mm Screw","description":"\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e680pcs M4 Bolts AssortmentThis M4 screw kit includes a total of 680 pieces: 160pcs of hex socket head cap screws in 7 commonly used metric lengths (M4×6mm:34pcs, M4×8mm:30pcs, M4×12mm:28pcs, M4×16mm:22pcs, M4×20mm:20pcs, M4×25mm:14pcs, M4×30mm:12pcs), plus 172pcs of matching M4 hex nuts, 172pcs of M4 flat washers, and 176pcs of M4 spring (lock) washers. An Allen wrench is also included. This screw assortment is designed to meet daily maintenance, repair, and assembly needs across a wide range of metric fastening tasks\u003c\/li\u003e\n\u003cli\u003e12.9 Grade Alloy Steel \u0026amp; Black Zinc PlatingThe M4 screws assortment kit are made from 12.9 grade alloy steel, which provides high tensile strength, hardness, and wear resistance. The M4 socket head cap screw,hex bolt black zinc plated finish offers protection against rust and corrosion, making these fasteners suitable for indoor and light outdoor use.\u003c\/li\u003e\n\u003cli\u003eHex Socket Head, Allen Drive \u0026amp; Spring Washer DesignThe recessed hex socket (Allen) drive allows for secure torque transmission and tightening even in confined or recessed spaces. Each M4 socket head screws features clean, burr‑free metric threads (M4 x 0.7) that help ensure smooth engagement with nuts and tapped holes, reducing the risk of cross‑threading. The M4 spring (lock) washers are designed to provide axial tension when compressed, which helps resist loosening caused by vibration – complementing the flat washers for more secure assemblies.\u003c\/li\u003e\n\u003cli\u003eOrganized Storage BoxThe M4 bolt kit come in a sturdy, compartmentalized plastic storage case with dedicated sections for each screw size, as well as separate compartments for nuts, flat washers, and spring washers. All pieces remain neatly sorted, clearly separated, and easily accessible, reducing time spent searching for the right fastener. The M4 assortment compact and portable design fits easily into tool bags, drawers, or shelves.\u003c\/li\u003e\n\u003cli\u003eWide ApplicationsThis M4 hardware kit is suitable for a broad range of applications, including 3D printers (frame assembly, extruder mounting), CNC machinery, electronics enclosures, RC models and drones, furniture assembly (chairs, small hardware), bicycle repairs, and general DIY projects. Having a complete assortment of metric M4 machine screws, washers, bolts, and nuts on hand simplifies repairs and supports workflow efficiency.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFree shipping included. 30-day hassle-free returns.\u003c\/p\u003e","brand":"Belmont Warehouse","offers":[{"title":"Default Title","offer_id":43358179000529,"sku":"BW-B0GX167XB1","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/3123\/5793\/files\/71iBhCqhv_L._SL1500.jpg?v=1790989612","url":"https:\/\/belmontwarehouse.com\/products\/680pcs-m4-socket-head-bolts-assortment-kit-m4x6-8-12-16-20-30mm-screw","provider":"Belmont Warehouse","version":"1.0","type":"link"}