---
product_id: 6253906
title: "5521-4 1/4-20 Inch Coarse Thread Repair Kit"
brand: "helicoil"
price: "20342 Ft"
currency: HUF
in_stock: true
url: https://www.desertcart.hu/products/6253906-5521-4-1-4-20-inch-coarse-thread-repair-kit
store_origin: HU
region: Hungary
---

# 0.375 inch insert length 1/4-20 coarse thread size 12 precision inserts 5521-4 1/4-20 Inch Coarse Thread Repair Kit

**Brand:** helicoil
**Price:** 20342 Ft
**Availability:** ✅ In Stock

## Summary

> 🛠️ Restore with confidence—don’t let stripped threads slow you down!

## Quick Answers

- **What is this?** 5521-4 1/4-20 Inch Coarse Thread Repair Kit by helicoil
- **How much does it cost?** 20342 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/6253906-5521-4-1-4-20-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

- • **User-Friendly Kit:** Step-by-step instructions make thread repair effortless—even for first-timers
- • **Compact & Portable:** Lightweight 0.8 oz kit fits easily in your toolbox or work bag
- • **Trusted Performance:** Ideal for fixing stripped or damaged tapped holes caused by wear or corrosion
- • **Precision Engineered:** High-quality stainless steel coils ensure durable, long-lasting repairs
- • **Complete Repair Arsenal:** Includes 12 inserts, tap & installation tool for seamless thread restoration

## Overview

The Helicoil 5521-4 1/4-20 Inch Coarse Thread Repair Kit is a professional-grade solution designed to restore stripped or damaged tapped holes. Featuring 12 precision-formed stainless steel inserts, a dedicated tap, and installation tool, this compact kit offers durable, long-lasting repairs with easy-to-follow instructions. Perfect for mechanics and DIY pros seeking reliable thread restoration in a portable package.

## Description

Helicoil 5521-4 1/4-20 Inch Coarse Thread Repair Kit

## 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
- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Heli-Coil |
| Brand | Helicoil |
| Model | 5521-4 |
| Item Weight | 0.8 ounces |
| Product Dimensions | 3.7 x 0.4 x 4.5 inches |
| Item model number | 5521-4 |
| Is Discontinued By Manufacturer | No |
| Exterior | Smooth |
| Manufacturer Part Number | 5521-4 |

## 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

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**Shop now:** [https://www.desertcart.hu/products/6253906-5521-4-1-4-20-inch-coarse-thread-repair-kit](https://www.desertcart.hu/products/6253906-5521-4-1-4-20-inch-coarse-thread-repair-kit)

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-02-06*