---
product_id: 7730490
title: "Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit"
brand: "helicoil"
price: "€ 68.33"
currency: EUR
in_stock: true
reviews_count: 8
category: "Helicoil"
url: https://www.desertcart.be/products/7730490-heli-coil-5521-6-3-8-16-inch-coarse-thread
store_origin: BE
region: Belgium
---

# Complete kit with tap & installation tool 3/8-16 coarse thread size 12 high-quality inserts included Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit

**Brand:** helicoil
**Price:** € 68.33
**Availability:** ✅ In Stock

## Summary

> 🔩 Fix it right, fix it fast—because stripped threads don’t wait!

## Quick Answers

- **What is this?** Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit by helicoil
- **How much does it cost?** € 68.33 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/7730490-heli-coil-5521-6-3-8-16-inch-coarse-thread)

## 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

- • **All-in-One Kit:** Includes tap, installation tool, and 12 inserts—everything you need in one pack
- • **Compact & Portable:** Lightweight 4 oz kit with sleek packaging—perfect for on-the-go pros
- • **User-Friendly Design:** Clear, step-by-step instructions make repairs quick and hassle-free
- • **Precision Thread Repair:** Restore stripped holes with exact 3/8-16 inserts for a flawless fit
- • **Durability You Can Trust:** Crafted from premium materials to withstand wear, corrosion, and over-torque

## Overview

The Heli-Coil 5521-6 is a professional-grade 3/8-16 coarse thread repair kit featuring 12 durable inserts, a precision tap, and installation tool. Designed for quick restoration of damaged or stripped tapped holes, it combines high-quality materials with user-friendly instructions, making it an essential tool for automotive and mechanical professionals seeking reliable, long-lasting thread repairs.

## Description

Helicoil Inch Coarse Thread Repair Kit includes inserts, detailed instructions, Heli-Coil tap and installation tool. It is made from high quality material and is extremely long lasting. This inch coarse thread repair kit is used for repairing tapped holes which have been stripped or damaged, due to wear, corrosion and over torque. It comes with a package type of durable placon or vinyl pouches.

Review: Helix Coil That works - Works great. Used it on my outboard lower unit.
Review: Great product - Had to drill out a bolt stuck in old cast steel. IMHO these are the best heli-coils you can get. I just wish they would also supply correct the drill bit. Luckily I had one on hand. Otherwise you should also order the proper size bit for the coil size

## Features

- The product is 3/8-16thread 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 |
|---------------|-------|
| ASIN | B0002SRDVE |
| Best Sellers Rank | #178,230 in Automotive ( See Top 100 in Automotive ) #117 in Thread Metric Inserts & Repair Kits |
| Brand | Helicoil |
| Customer Reviews | 4.7 4.7 out of 5 stars (438) |
| Date First Available | October 10, 2006 |
| Exterior | Smooth |
| Item Weight | 4 ounces |
| Item model number | 5521-6 |
| Manufacturer | Heli-Coil |
| Manufacturer Part Number | 55216 |
| Model | 5521-6 |
| OEM Part Number | 5521-6 |
| Product Dimensions | 5.8 x 0.6 x 3.6 inches |

## Images

![Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit - Image 1](https://m.media-amazon.com/images/I/715tpMezVDL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Helix Coil That works
*by M***N on July 21, 2026*

Works great. Used it on my outboard lower unit.

### ⭐⭐⭐⭐⭐ Great product
*by L***0 on March 17, 2025*

Had to drill out a bolt stuck in old cast steel. IMHO these are the best heli-coils you can get. I just wish they would also supply correct the drill bit. Luckily I had one on hand. Otherwise you should also order the proper size bit for the coil size

### ⭐⭐⭐⭐⭐ Tool worth and inserts worth the puchase
*by T***T on October 24, 2025*

This comes with the insert tool with multiple heli-coils.

## Frequently Bought Together

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

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**Shop now:** [https://www.desertcart.be/products/7730490-heli-coil-5521-6-3-8-16-inch-coarse-thread](https://www.desertcart.be/products/7730490-heli-coil-5521-6-3-8-16-inch-coarse-thread)

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-10-03*