---
product_id: 488982919
title: "Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7'')"
price: "€ 53.12"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.fi/products/488982919-dunzy-4-pcs-square-u-bolts-zinc-plated-heavy-duty
store_origin: FI
region: Finland
---

# 3'' width x 7'' length ideal size 3/8'' diameter precision fit Zinc-plated carbon steel, rust-resistant Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7'')

**Price:** € 53.12
**Availability:** ✅ In Stock

## Summary

> 🔧 Lock in strength and style with Dunzy’s heavy-duty U bolts!

## Quick Answers

- **What is this?** Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7'')
- **How much does it cost?** € 53.12 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/488982919-dunzy-4-pcs-square-u-bolts-zinc-plated-heavy-duty)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete 4-Piece Set:** Includes bolts, frame plates, and nuts for hassle-free installation and replacements.
- • **Versatile Industrial & DIY Use:** Ideal for boat trailers, wood, metal, and more—your go-to fastening solution.
- • **Corrosion-Resistant Zinc Plating:** Keeps your hardware looking sharp and performing flawlessly, rain or shine.
- • **Heavy-Duty Carbon Steel Strength:** Engineered to withstand harsh environments and heavy loads without compromise.
- • **Precision Fit for 3x3'' Structures:** Perfectly sized to secure square tubes and frames with confidence.

## Overview

Dunzy’s 4-piece square U bolt set features 3/8'' diameter, 3'' width, and 7'' length bolts made from zinc-plated carbon steel. Designed for durability and corrosion resistance, these bolts are perfect for securing 3x3'' square tubes and frames in industrial, automotive, and DIY projects. Each set includes bolts, frame plates, and nuts, ensuring a complete fastening solution that performs reliably in wet and demanding environments.

## Description

Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7''): desertcart.com: Industrial & Scientific

Review: Great product and price. - Great product.
Review: Good product good price - Very useful but beware of the length not only the width of the bolts.

## Features

- Common Size: the square U bolts measures about 3/8 inch in diameter, 3 inch in width and 7 inch in length, proper for 3 x 3 inch square, suitable size can meet your different fastening needs, please check the size before ordering
- Sufficient Quantity: you will receive 4 pack of square U bolts in zinc, including 4 pieces of u bolts, 4 pieces of frame plates and 8 pieces of nuts; Enough quantity satisfy your uses and replacements
- Hard Material: the square U bolt adopts carbon steel material, and with zinc plated, sturdy and reliable, with nice rust and corrosion resistance, each bolt can withstand the weight, still perform well in rainy and wet environments
- Wide Applications: the U bolts are widely suitable for various fields, such as industry, manufacturing, maintenance, the automotive sector, clothing production, etc., ideal for fastening tubes, woods, trailer, and so on
- Tips: It is recommended to use lubricant during installing the U bolts to prevent wear and tear; Use a manual wrench or socket ratchet when installing nuts; Do not use high speed power tools or impact tools to tighten the nuts

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #42,643 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #15 in U-Bolts |
| Color | carbon steel plated |
| Customer Reviews | 4.6 out of 5 stars 285 Reviews |
| Exterior Finish | Zinc |
| Fastener Type | U-Bolt |
| Head Style | Square, U-Bolt |
| Manufacturer Grade | Grade 2 |
| Material | Carbon Steel |

## Product Details

- **Material:** Carbon Steel, Zinc
- **Exterior Finish:** Zinc
- **Manufacturer Grade:** Grade 2
- **Head Style:** Square, U-Bolt
- **Color:** carbon steel plated

## Images

![Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7'') - Image 1](https://m.media-amazon.com/images/I/71Zqs4Ak8bL.jpg)

## Available Options

This product comes in different **Color, Size, Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product and price.
*by O***E on December 18, 2025*

Great product.

### ⭐⭐⭐⭐⭐ Good product good price
*by S***N on December 7, 2025*

Very useful but beware of the length not only the width of the bolts.

### ⭐⭐⭐⭐⭐ Fasteners will keep it together.
*by J***M on June 30, 2025*

Not a lot can go wrong with these. Only time will tell how yhey weather. So far they seem as good of quality as any others I have gotten, while maintaining a low price.

## Frequently Bought Together

- Dunzy 4 Pcs Square U Bolts Zinc Plated, Heavy Duty Carbon Steel U Bolt Industrial and Scientific Supplies for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' X 3'' X 7'')
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**Shop now:** [https://www.desertcart.fi/products/488982919-dunzy-4-pcs-square-u-bolts-zinc-plated-heavy-duty](https://www.desertcart.fi/products/488982919-dunzy-4-pcs-square-u-bolts-zinc-plated-heavy-duty)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-09*