---
product_id: 257362955
title: "Mellewell 1/4-20 x 3-1/2\" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets"
brand: "mellewell"
price: "$27.63"
currency: USD
in_stock: true
reviews_count: 13
category: "Mellewell"
url: https://www.desertcart.us/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head
store_origin: US
region: United States of America
---

# 1/4-20 Thread Diameter Fully Threaded 3.5-inch Length 18-8 Stainless Steel Corrosion Resistance Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets

**Brand:** mellewell
**Price:** $27.63
**Availability:** ✅ In Stock

## Summary

> 🔧 Lock in strength, unlock endless possibilities!

## Quick Answers

- **What is this?** Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets by mellewell
- **How much does it cost?** $27.63 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head)

## Best For

- mellewell enthusiasts

## Why This Product

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

## Key Features

- • **Complete Assembly Kit:** Includes 8 sets of hex bolts, nuts, thick flat & lock washers for a ready-to-use fastening solution.
- • **Trusted by Professionals:** Ranked #22 in Hex Bolts, delivering reliable performance and peace of mind.
- • **Versatile Industrial Grade:** Ideal for home, office, machinery, ship assembly, and communication equipment applications.
- • **Precision Engineered Strength:** Crafted from premium 18-8 stainless steel for unmatched durability and corrosion resistance.
- • **Fully Threaded for Maximum Grip:** 3-1/2 inch length with full threading ensures secure fastening in diverse materials.

## Overview

The Mellewell 1/4-20 x 3-1/2" Hex Head Bolt sets feature fully threaded 18-8 stainless steel bolts with hex nuts and thick flat & lock washers. Engineered for superior corrosion resistance and strength, these 8 complete sets are perfect for professional-grade fastening in industrial, home, and office applications.

## Description

Product Description Hex head cap screws are precision threaded fasteners with an External Hex Drive. They are known for their effecient application performance and endurance widely used in a variety of industries such as construction, manufacturing, engineering, assembling, aircraft and so on. Product Specification Drive Type: External Hex Screw Style: Hex Head Thread Coverage: Fully Threaded Screw Size: 1/4-20 Screw Length: 3-1/2" Material: Stainless Steel 18-8 (304) Finish: Plain Finish Package Included 8 PCS Hex bolts, 8 PCS Hex nuts, 8 PCS Flat washers and 8 PCS Lock washers.

Review: Great product! - Great price
Review: Great product, great price, great service - Great product, great price, great service

## Features

- Hex screw bolt can be widely used in the home and office appliance, communication equipments, ship assembly and other machinery industry.
- Made of high quality 18-8 (304) stainless steel, provides strength and great protection from corrosions and tarnishing.
- Screw Thread Diameter: 1/4"; Screw Thread Pitch: 20 TPI; Screw Length: 3-1/2". Extra-large and thick flat washer.
- Package Included: 8 Sets Hex Head Bolts, Hex Nuts, Flat & Lock Washers.
- Used Widely: Mellewell hex bolt kits can used widely in home, office, machinary. Any questions let us know and provide professional customer service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08G1HPJYY |
| Best Sellers Rank | #8,444 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #22 in Hex Bolts |
| Date First Available | August 17, 2020 |
| Finish Type | Bright |
| Head Style | Hex |
| Item Diameter | 0.25 Inches |
| Item Weight | 7.8 ounces |
| Item model number | WLJT-1/4-20-3-1/2-8P |
| Manufacturer | Mellewell |
| Number of Items | 8 |
| Number of Pieces | 32 |
| Shape | Cylinder |
| Thread Size | 1/4"-20 |

## Product Details

- **Brand:** Mellewell
- **Color:** Silver
- **Fastener Type:** Bolt
- **Material:** Stainless Steel
- **Size:** 1/4-20 x 3-1/2"

## Images

![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 1](https://m.media-amazon.com/images/I/618w+wIGMIL.jpg)
![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 2](https://m.media-amazon.com/images/I/61RtPnWBTyL.jpg)
![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 3](https://m.media-amazon.com/images/I/61c3dTdzj+L.jpg)
![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 4](https://m.media-amazon.com/images/I/61cyZuoPV8L.jpg)
![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 5](https://m.media-amazon.com/images/I/61V1sBHNUVL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product!
*by T***Y on December 3, 2025*

Great price

### ⭐⭐⭐⭐⭐ Great product, great price, great service
*by D***E on October 22, 2025*

Great product, great price, great service

### ⭐⭐⭐⭐⭐ Good stuff
*by R***N on October 17, 2025*

Quality set in a handy container.

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**Shop now:** [https://www.desertcart.us/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head](https://www.desertcart.us/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-19*