---
product_id: 268184728
title: "5521-4 1/4-20 Inch Coarse Thread Repair Kit"
brand: "helicoil"
price: "฿4608"
currency: THB
in_stock: true
url: https://www.desertcart.co.th/products/268184728-5521-4-1-4-20-inch-coarse-thread-repair-kit
store_origin: TH
region: Thailand
---

# 12 inserts 1/4-20 thread Complete tool kit 5521-4 1/4-20 Inch Coarse Thread Repair Kit

**Brand:** helicoil
**Price:** ฿4608
**Availability:** ✅ In Stock

## Summary

> 🔧 Fix it right the first time with Helicoil!

## Quick Answers

- **What is this?** 5521-4 1/4-20 Inch Coarse Thread Repair Kit by helicoil
- **How much does it cost?** ฿4608 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/268184728-5521-4-1-4-20-inch-coarse-thread-repair-kit)

## Best For

- helicoil enthusiasts

## Why This Product

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

## Key Features

- • **🌍 Global Quality:** Manufactured in China with high-quality materials for lasting performance.
- • **💼 Compact Design:** Lightweight and portable, perfect for professionals on the go.
- • **🔩 Effortless Repairs:** Transform damaged threads into robust connections with ease.
- • **📚 Comprehensive Guide:** Includes step-by-step instructions for hassle-free installation.
- • **📏 Precision Engineering:** Crafted for a perfect fit, ensuring durability and reliability.

## Overview

The Helicoil5521-4 1/4-20 Inch Coarse Thread Repair Kit is a professional-grade solution designed to effortlessly repair stripped or damaged threads. This kit includes 12 high-quality inserts, a Heli-Coil tap, and an installation tool, all packaged in a compact design for easy transport. With clear instructions, it’s perfect for both seasoned pros and DIY enthusiasts looking to maintain their tools and equipment.

## Description

Helicoil

## Features

- The product is 1/4-20thread repair kit
- Easy and simple use kit
- The product is manufactured in china
- Includes 12 inserts, complete instructions, Heli-Coil tap and installation tool
- Used for repairing tapped holes
- Made from high quality material
- Comes in carded packing
- Easy to use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Heli-Coil |
| Brand | Helicoil |
| Model | 5521-4 |
| Product Dimensions | 9.4 x 1.02 x 11.43 cm; 22.68 g |
| Item model number | 5521-4 |
| Exterior | Smooth |
| Manufacturer Part Number | 5521-4 |
| Item Weight | 22.7 g |

## Images

![5521-4 1/4-20 Inch Coarse Thread Repair Kit - Image 1](https://m.media-amazon.com/images/I/71CGPWx5PnL.jpg)

## Questions & Answers

**Q: what size is the tap in this kit???**
A: The tap is special for Heli-Coil and not a standard bolt size.  The ID of the coil is 1/4-20 but the tap cuts the thread for the coil OD so it is still 20 tpi but much larger than 1/4 inch.  The only larger tap with 20 tpi is 7/16 which is far too large.

**Q: How do I break off the tang?**
A: Use the installation tool with the slot. Leave in place when you install helicoil and tap tool with hammer, this will break tang.

**Q: Can this tap a new hole?**
A: I used it to repair threads.  If the new hole is close to 17/64 it will work.  The recommended drill is 17/64, if the new hole is larger than 17/64 you will not get the proper thread cut, if the new hole is smaller than 17/64, drill the new hole to 17/64.

**Q: Can these heli-coils be used in a set screw application?**
A: Yes! As long as there is enough depth to the hole and use the correct coil and screw length.

## Frequently Bought Together

- Helicoil 5521-4 1/4-20 Inch Coarse Thread Repair Kit
- Helicoil 5521-5 5/16-18 Inch Coarse Thread Repair Kit
- Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.th/products/268184728-5521-4-1-4-20-inch-coarse-thread-repair-kit](https://www.desertcart.co.th/products/268184728-5521-4-1-4-20-inch-coarse-thread-repair-kit)

---

*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-04-29*