---
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: "S$38"
currency: SGD
in_stock: true
url: https://www.desertcart.sg/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head
store_origin: SG
region: Singapore
---

# 1/4-20 Thread Precision Fully Threaded 3.5-inch Length 18-8 Stainless Steel Strength 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:** S$38
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your build game with bolts that mean business!

## 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?** S$38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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 hex bolts, nuts, thick flat & lock washers—everything you need for a professional finish.
- • **Effortless Installation:** External hex drive design offers quick, reliable fastening with standard tools—no fuss, just results.
- • **Industrial-Grade Durability:** Crafted from premium 18-8 stainless steel for unmatched corrosion resistance and long-lasting strength.
- • **Versatile Application Powerhouse:** Perfect for home, office, machinery, ship assembly, and communication equipment projects.
- • **Precision Threading for Secure Fit:** Fully threaded 1/4-20 bolts ensure maximum grip and stability in every application.

## Overview

Mellewell’s 1/4-20 x 3-1/2" hex head bolt sets feature fully threaded, corrosion-resistant 18-8 stainless steel hardware, including nuts and thick flat & lock washers. Designed for versatile industrial and home use, these precision fasteners deliver reliable strength and professional-grade assembly in every pack of 8 sets.

## 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.

## 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 |
|---------------|-------|
| Head Style | Hex |
| Finish Type | Bright |
| Shape | Cylinder |
| Item Diameter | 0.25 Inches |
| Thread Size | 1/4"-20 |
| Number of Pieces | 32 |
| Number of Items | 8 |
| Manufacturer | Mellewell |
| Item Weight | 7.8 ounces |
| ASIN | B08G1HPJYY |
| Item model number | WLJT-1/4-20-3-1/2-8P |
| Date First Available | August 17, 2020 |

## Product Details

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

## 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.

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

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-01-28*