---
product_id: 104465478
title: "K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects"
brand: "kimetals"
price: "₩542922"
currency: KRW
in_stock: true
reviews_count: 8
category: "Kimetals"
url: https://www.desertcart.kr/products/104465478-k-i-metals-mild-steel-boxsection-3000mm-length-3m-x
store_origin: KR
region: South Korea
---

# 3M length precision 40x40MM versatile size 3MM wall thickness strength K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects

**Brand:** kimetals
**Price:** ₩542922
**Availability:** ✅ In Stock

## Summary

> 🏗️ Build Bold, Build Brilliant – Steel That Means Business

## Quick Answers

- **What is this?** K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects by kimetals
- **How much does it cost?** ₩542922 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/104465478-k-i-metals-mild-steel-boxsection-3000mm-length-3m-x)

## Best For

- kimetals enthusiasts

## Why This Product

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

## Key Features

- • **Certified UK Quality:** CE-certified and UK-manufactured steel delivers trusted safety and long-lasting performance.
- • **Engineered for Endurance:** High-grade mild steel ensures unmatched durability and structural integrity for your toughest projects.
- • **Precision-Cut Perfection:** Exact 3000mm x 40mm x 40mm dimensions guarantee seamless welding, cutting, and assembly every time.
- • **Effortless Project Upgrade:** Transform your metalwork with a reliable, weldable box section that professionals swear by.
- • **Versatility Meets Strength:** Ideal for everything from residential DIY to heavy-duty construction, adapting effortlessly to your needs.

## Overview

K I Metals Mild Steel BoxSection is a premium, CE-certified UK-made square steel tube measuring 3 meters in length with a 40mm width and height, and a robust 3mm wall thickness. Designed for superior weldability and strength, it’s perfect for construction, residential, and DIY projects requiring precision and durability.

## Description

Free delivery and returns on all eligible orders. Shop K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects.

Review: Great company - Well packaged, good quality and at a consumer freindly price. Will be keeping the name to pass on and future orders if amd when required. Thanks again
Review: Great quality - Brilliant quality just what I ordered

## Features

- Strong Weldable Mild Steel Tubing for Metalwork and Structures: Made from high-grade mild steel, this square hollow section is designed for maximum strength and durability. Its excellent weldability makes it ideal for metal frames, supports, fencing, and construction projects.
- Versatile Sizes for Every Project Requirement: This mild steel box section is offered in widths ranging from 20mm to 100mm and lengths from 0.5m to 3m, ensuring flexibility to suit all types of construction, industrial, or DIY applications. Perfect for heavy-duty and light-duty projects alike.
- Precision Cut 20mm x 20mm x 2mm Box Section Steel: The steel tubing is precision-engineered with close tolerances to deliver reliable performance in cutting, bending, drilling, and welding tasks. Its exact dimensions ensure ease of use in any structural or creative design.
- Durable UK-Made Steel Certified for Quality and Safety: Manufactured in the UK from premium mild steel, this box section is CE-certified to meet strict industry standards. Its durable mill finish ensures long-lasting use, even in demanding environments.
- Perfect for Custom and Structural Applications: Whether you’re fabricating furniture, building fences, or creating custom metal structures, this square hollow steel tubing offers the perfect combination of strength, flexibility, and reliability for a wide range of uses.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07CZKSTLH |
| Best Sellers Rank | 24,277 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 14 in Steel Tubes |
| Brand | KIMETALS |
| Customer Reviews | 4.5 4.5 out of 5 stars (212) |
| Date First Available | 20 July 2018 |
| Item Weight | 10.1 kg |
| Manufacturer | KIMETALS |
| Product Dimensions | 300 x 4 x 4 cm; 10.1 kg |

## Product Details

- **Brand:** KIMETALS
- **Colour:** Silver
- **Item length:** 3 Metres
- **Item weight:** 10.1 Kilograms
- **Manufacturer:** KIMETALS
- **Material:** 40MM W x 40MM H x 3MM T
- **Nominal wall thickness:** 3 mm
- **Outside diameter:** 56.57 Millimetres
- **Product dimensions:** 40W millimetres

## Images

![K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects - Image 1](https://m.media-amazon.com/images/I/71ObpD-jgPL.jpg)
![K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects - Image 2](https://m.media-amazon.com/images/I/81AHXhG33TL.jpg)
![K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects - Image 3](https://m.media-amazon.com/images/I/81sStQogveL.jpg)
![K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects - Image 4](https://m.media-amazon.com/images/I/61OOrJWyaXL.jpg)
![K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects - Image 5](https://m.media-amazon.com/images/I/713czq2HXyL.jpg)

## Available Options

This product comes in different **Material Type, Size** options.

## Questions & Answers

**Q: Are sizes inturnal or xturnal**
A: xturnal

**Q: Could it be used to withstand the weight of two people? Serious to make a bunk bed**
A: They are strong to be fair but would think the longer the length the more likely they would sag - I used them to make a pair of trestles and have had up to 500kg on them

**Q: How many lengths do you get for the price?**
A: Only 1, best to find your local metal supplier as it will be a lot cheaper

**Q: What would the weight be of a 3metre length 50x50 thanks**
A: Approx 14kg

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great company
*by D***O on 12 August 2025*

Well packaged, good quality and at a consumer freindly price. Will be keeping the name to pass on and future orders if amd when required. Thanks again

### ⭐⭐⭐⭐⭐ Great quality
*by A***E on 26 March 2025*

Brilliant quality just what I ordered

### ⭐⭐⭐⭐ Good quality steel
*by A***R on 24 August 2025*

Postage was shocking,

## Frequently Bought Together

- K I Metals Mild Steel BoxSection -3000MM Length (3M) x 40MM Width x 40MM Height x 3MM Wall Thickness, Durable Square Mild Steel Tubes for Constructions, Residential & DIY Projects
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- General Purpose E6013 ARC Welding Electrodes Rods for Mild Steel by MKGT® (4.0mm, 2.5kg)

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**Shop now:** [https://www.desertcart.kr/products/104465478-k-i-metals-mild-steel-boxsection-3000mm-length-3m-x](https://www.desertcart.kr/products/104465478-k-i-metals-mild-steel-boxsection-3000mm-length-3m-x)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-02-27*