---
product_id: 684252172
title: "M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish"
brand: "youyidun"
price: "HK$1390"
currency: HKD
in_stock: false
reviews_count: 5
category: "Youyidun"
url: https://www.desertcart.hk/products/684252172-m3-hex-socket-head-cap-screws-bolts-and-nuts-washers
store_origin: HK
region: Hong Kong
---

# 801 pcs total - ultimate variety Compartmentalized storage box - organized & portable 12.9 grade alloy steel - industrial strength M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish

**Brand:** youyidun
**Price:** HK$1390
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Elevate your build game with the ultimate M3 fastener arsenal!

## Quick Answers

- **What is this?** M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish by youyidun
- **How much does it cost?** HK$1390 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/684252172-m3-hex-socket-head-cap-screws-bolts-and-nuts-washers)

## Best For

- youyidun enthusiasts

## Why This Product

- Trusted youyidun brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Storage Solution:** Transparent, compartmentalized box keeps your fasteners perfectly organized and ready to deploy on the go.
- • **Comprehensive Assortment:** 801-piece kit with multiple screw lengths, nuts, and washers to cover every professional and DIY project need.
- • **Flawless Hex Socket Design:** Smooth, tight threads and anti-slip hex socket heads ensure effortless installation and zero stripping frustration.
- • **Precision Engineered Strength:** Crafted from premium 12.9 grade alloy steel for unmatched durability and corrosion resistance in any environment.
- • **Versatile Application Powerhouse:** Ideal for electronics, automotive, furniture, and mechanical repairs—engineered to keep your projects flawless.

## Overview

This M3 Hex Socket Head Cap Screws, Bolts, Nuts, and Washers Assortment Kit features 801 pieces of fully threaded, black oxide finished fasteners made from high-strength 12.9 grade alloy steel. Designed for superior corrosion and wear resistance, the kit includes a variety of screw lengths, nuts, and washers stored in a durable, compartmentalized box for easy access. Perfect for professionals and hobbyists tackling electronics, automotive, furniture, and mechanical projects.

## Description

What are the advantages of our 12.9 grade alloy steel hex socket bolts assortment kit? The hex head cap screw bolts and nut set are made of 12.9 grade high-quality alloy steel, which has good corrosion resistance, high temperature resistance and wear resistance, and is durable. Black hex drive head nuts and bolts will both be placed in a clear plastic box with matching labels, easy to use and install. The hexagonal socket cap design can be easily installed with a hexagonal wrench, and it is not easy to slip out. Used in electronic products, electrical products, furniture, household appliances, bicycle, car, and motorcycle maintenance, mechanical equipment, ship accessories and other fields. Featurese: Material: Aloy Steel Color: Black Size: M3 Quantity: 801 Pcs Package Includes: 40 Pcs - M3x6mm 35 Pcs - M3x8mm 35 Pcs - M3x10mm 30 Pcs - M3x12mm 30 Pcs - M3x16mm 20 Pcs - M3x18mm 20 Pcs - M3x20mm 20 Pcs - M3x25mm 20 Pcs - M3x30mm 20 Pcs - M3x35mm 265 Pcs - M3 Nuts 265 Pcs - M3 Washers Warranty after sale: If you have any questions about the hex socket head cap bolts nuts washers assortment sets, please contact us in time, we will solve your questions ASAP. Warm Tips: Color may vary slightly from the online image due to your monitor colour settings, please refer to the actual product, thank you for your understanding.

Review: Perfect for my RC builds. Durable and hard to get stripped. Unlike the Philips screws and Nuts
Review: I have commented on this before to no avail, this product is misleading and labeled as m3 when in fact I received m4 this has caused so many issues please fix this

## Features

- Exquisite Material: The hex socket head cap screws bolts and nuts set are made of high-quality 12.9 grade alloy steel, which has good corrosion resistance, high temperature resistance, wear resistance, high hardness, oxidation resistance and durability, not easy to break or deform, and resistant to rust , can maintain good performance in harsh environments
- Hex Socket Head Cap Design: Tight threads are clean, accurate, and smooth, not prone to warping during rolling. The Socket head cap design can be easily installed with a hexagonal wrench, and it is not easy to slip out. The combination of Washers and hex nuts can increase the contact area, reduce pressure, prevent loosening and protect parts
- Easy to Store: All socket head screws and nuts and flat washers set are stored in a transparent and sturdy storage box with compartments. Hex socket cap head screws are stored separately, well organized, easy to carry and find. There is no confusion during transportation and it is convenient to use
- Wide Range of Applications: Ideal for use by professionals, woodworkers, hobbyists, landlords, repairmen, and others. Suitable for electronic products, furniture installation and maintenance, household appliances, bicycles, automobiles, motorcycles and other vehicle maintenance, mechanical equipment, ship accessories and other fields
- Package Includes: 801 pcs in total, including 40 pcs m3x6mm, 35 pcs m3x8mm, 35 pcs m3x10mm, 30 pcs m3x12mm, 30 pcs m3x16mm, 20 pcs m3x18mm, 20 pcs m3x20mm, 20 pcs m3x25mm, 20 pcs m3x30mm , 20 pcs m3x35mm, 265 pcs m3 nuts, 265 pcs m3 washers, rich in size and quantity, to meet your needs in different occasions and fields.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CMC3RCVX |
| Are batteries included? | No |
| Compatible groove diameter | 3 Millimeters |
| Customer Reviews | 4.6 4.6 out of 5 stars (146) |
| Date First Available | 16 December 2023 |
| Finish Type | Black Oxide |
| Head Style | Socket |
| Item Weight | 449 g |
| Item part number | 1 |
| Manufacturer | CHINA |
| Maximum Shear Strength | 830 MPa |
| Net Quantity | 15.1678 Grams |
| Number of Pieces | 801 |
| Package Dimensions | 17.4 x 9.8 x 2.11 cm; 449 g |
| Shape | Cylindrical, Hexagonal |
| Thread Size | M3 |

## Product Details

- **Brand:** YOUYIDUN
- **Colour:** Black
- **Fastener Type:** Socket Head
- **Material:** Alloy Steel
- **Size:** M3-801

## Images

![M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish - Image 1](https://m.media-amazon.com/images/I/41iScX7SnFL.jpg)
![M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish - Image 2](https://m.media-amazon.com/images/I/41psXOQOEOL.jpg)
![M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish - Image 3](https://m.media-amazon.com/images/I/515ioB5kxSL.jpg)
![M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish - Image 4](https://m.media-amazon.com/images/I/51I4gA0Q2+L.jpg)
![M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish - Image 5](https://m.media-amazon.com/images/I/51XRnBwpTnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***M on 30 October 2025*

Perfect for my RC builds. Durable and hard to get stripped. Unlike the Philips screws and Nuts

### ⭐ Review
*by H***E on 22 January 2025*

I have commented on this before to no avail, this product is misleading and labeled as m3 when in fact I received m4 this has caused so many issues please fix this

### ⭐⭐⭐⭐⭐ Review
*by C***D on 21 January 2025*

I'm getting into 3D printing, and M3 screws are kind of the standard used when you need to bolt parts together, so I ordered this, a nice variety of M3 screws, a bunch of M3 bolts and washers. For attaching 3D printed plastic stuff together, these work great. And the price was good too. A good deal. The case they come in seems nice also, it provides easy access to them and convenient storage.

## Frequently Bought Together

- M3 Hex Socket Head Cap Screws Bolts and Nuts and Washers Assortment Kit, 801 Pcs Metric Allen Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Fully Threaded, Black Oxide Finish
- Kadrick Metric Screw Assortment, 660 Pcs M2 Screws, M2*4mm/6mm/8mm/10mm/12mm/16mm,12.9 Grade Alloy Steel, Metric Hex Socket Head Cap Screws Nuts Washers Kit, Black Zinc Plated Anti Rust Upgrade
- VGBUY 500Pcs M4 Screw Kit, Black M4 Screws (7 Sizes 6-30mm), Assorted Metric Nuts and Bolts Assortment Kit, Hex Socket Head Cap M4 x 6/8/12/16/20/25/30mm with Washer Nuts, 12.9 Grade

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**Shop now:** [https://www.desertcart.hk/products/684252172-m3-hex-socket-head-cap-screws-bolts-and-nuts-washers](https://www.desertcart.hk/products/684252172-m3-hex-socket-head-cap-screws-bolts-and-nuts-washers)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-03*