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mxuteuk 521PCS M4 Screws Assortment Kit,M4×6/8/12/16/20/30mm 6 Size Hex Socket Head Cap Bolts, Nuts & Washers Set,12.9 Grade Alloy Steel Black Zinc M4 Bolts for Mechanical, Repair & DIY - size: 521PCS M4

mxuteuk 521PCS M4 Screws Assortment Kit,M4×6/8/12/16/20/30mm 6 Size Hex Socket Head Cap Bolts, Nuts & Washers Set,12.9 Grade Alloy Steel Black Zinc M4 Bolts for Mechanical, Repair & DIY - size: 521PCS M4

$14.92 USD
$14.92 USD
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Taxes included. Shipping calculated at checkout.

About this item

  • Our M4 screws kit includes a full range of standard specifications:M4×6/8/12/16/20/30mm hex socket cap screws, paired with matching M4 bolts, nuts, and flat washers. Strictly manufactured according to metric standards, with dimensional accuracy controlled within 0.01mm, ensuring smooth installation and reliable connection for various professional and daily uses.
  • All M4 screws are forged from high-strength 12.9 grade alloy steel, featuring outstanding hardness, tensile strength, and load-bearing performance. They effectively resist abrasion, deformation, and external impact, making this M4 screws assortment kit stable and durable even in long-term use and complex working environments.
  • Wide Application:This all-in-one M4 screws assortment kit is a must-have for DIY enthusiasts, makers and technicians. Widely applied in 3D printer assembly and maintenance, electronic equipment repair, RC model building, furniture replacement, handicraft DIY and CNC machinery installation, delivering stable fastening for daily and handmade projects.
  • The surface adopts blackening treatment can isolate air and water vapor, which can effectively prevent rust; Reduce the friction and wear of threads and contact surfaces during DIY and 3D printer assembly. Excellent anti-rust and anti-corrosion performance greatly extends service life, suitable for indoor use and light outdoor applications.
  • This all-in-one M4 screws kits comes with a sturdy, transparent, compartmentalized storage box, with clear size labels on each slot. You can quickly identify and take the M4 bolts you need, keeping your workbench neat and improving efficiency for 3D printing, DIY projects, and daily repairs.

Overview

  • Size: 521PCS M4
  • Color: Hex Socket Head
  • Material: Carbon Steel
  • Brand: mxuteuk
  • Item dimensions L x W x H: 0.43 x 0.43 x 0.43 inches

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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