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680PCS M4 Socket Head Bolts Assortment Kit, M4x6/8/12/16/20/30mm Screw - size: G12.9 M4 680PCS

680PCS M4 Socket Head Bolts Assortment Kit, M4x6/8/12/16/20/30mm Screw - size: G12.9 M4 680PCS

$23.22 USD
$23.22 USD
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About this item

  • 【680pcs M4 Bolts Assortment】This 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
  • 【12.9 Grade Alloy Steel & Black Zinc Plating】The 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.
  • 【Hex Socket Head, Allen Drive & Spring Washer Design】The 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.
  • 【Organized Storage Box】The 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.
  • 【Wide Applications】This 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.

Overview

  • Material: Alloy Steel
  • Thread Size: m4-0.7
  • Exterior Finish: Zinc
  • Manufacturer Grade: 12.9
  • Head Style: Hex Socket Head

Low stock: 10 left

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Reviews

  • ⭐⭐⭐⭐⭐

    Hannah Miller — Seattle, Washington
    I ordered several science activity supplies for projects at home. The product descriptions made it easier to compare the available options, and everything fit neatly into our learning space. Stemora made finding tools for hands-on activities feel simple and organized.

  • ⭐⭐⭐⭐⭐

    Daniel Foster — Austin, Texas
    I found a useful selection of electronics and robotics accessories for a beginner project. It was convenient to browse related components in clearly organized categories. I would consider shopping here again when planning another maker activity.

  • ⭐⭐⭐⭐⭐

    Lauren Bennett — Denver, Colorado
    The measurement and observation tools I selected worked well for the classroom activities I had planned. I especially appreciated being able to review the product details before ordering and choose items that matched the lesson requirements.

  • ⭐⭐⭐⭐⭐

    Jason Parker — Portland, Oregon
    I purchased a few storage items and small tools for organizing my maker workspace. The products helped keep components, wires, and project materials easier to sort and access. The overall shopping experience was straightforward and convenient.

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FAQ

What types of products does Stemora offer?


Stemora offers supplies for science experiments, microscopy, biology learning, measurement, laboratory organization, electronics, robotics, coding education, 3D printing, maker projects, and classroom activities. Available products and specifications may change over time.

Are Stemora products suitable for children?


Recommended ages vary by product. Please review the product description, manufacturer guidance, included warnings, and required skill level before purchasing. Products containing small parts, tools, electrical components, glass, or chemicals may not be suitable for young children.

Is adult supervision required?


Adult supervision is recommended for children and students, especially when using electrical components, sharp tools, heated equipment, glassware, small parts, or experiment materials. Customers are responsible for following all product instructions and safety precautions.

Can these products be used at home and in classrooms?


Many products may be suitable for classrooms, home learning, science projects, maker spaces, and hobby activities. Suitability depends on the specific product, learning environment, user experience, and intended activity.

How can I check what is included with a product?


Please review the product title, description, specifications, images, package quantity, and included-components section before ordering. Items shown for demonstration or scale in product images may not always be included.

How do I know whether an electronic or robotics part is compatible?


Check the listed dimensions, voltage, connector type, board compatibility, operating requirements, and supported platforms. Compatibility is not guaranteed unless it is specifically stated on the product page. Contact us before ordering if you need clarification.

When will I receive tracking information?


Tracking information is generally provided within 3–5 business days after an order is confirmed. In some cases, processing may take approximately 7–8 business days. Delivery may require an additional 4–5 business days after tracking becomes available, depending on the carrier and destination.

Why did my order arrive in separate packages?


Products in the same order may be shipped from different fulfillment locations. As a result, items may arrive separately and have different tracking numbers. You will not be charged additional shipping fees solely because an order is divided into multiple packages.

Can I change or cancel my order?


Contact us as soon as possible at vaioamaonaoak@gmail.com. We will try to assist, but changes or cancellations cannot be guaranteed once an order has entered processing or has been shipped.

What should I do if an item arrives damaged, defective, or incorrect?


Contact us promptly at vaioamaonaoak@gmail.com with your order number, a description of the issue, and clear photographs of the item, packaging, and shipping label. Please retain the product and original packaging while we review your request. Eligibility and available resolutions are subject to our Return & Refund Policy.

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