---
product_id: 7968410
title: "5521-5 5/16-18 Inch Coarse Thread Repair Kit"
brand: "helicoil"
price: "$1738"
currency: MXN
in_stock: true
reviews_count: 8
category: "Helicoil"
url: https://www.desertcart.mx/products/7968410-5521-5-5-16-18-inch-coarse-thread-repair-kit
store_origin: MX
region: Mexico
---

# Compact 4.4 x 3.6 in kit, easy storage 12 inserts for versatile repairs 5/16-18 coarse thread size, universal fit 5521-5 5/16-18 Inch Coarse Thread Repair Kit

**Brand:** helicoil
**Price:** $1738
**Availability:** ✅ In Stock

## Summary

> 🔩 Fix it once, fix it right — don’t let stripped threads slow you down!

## Quick Answers

- **What is this?** 5521-5 5/16-18 Inch Coarse Thread Repair Kit by helicoil
- **How much does it cost?** $1738 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/7968410-5521-5-5-16-18-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

- • **Compact & Organized Kit:** All essentials packed in a sleek, carded case for quick access and portability.
- • **Versatile Thread Repair Mastery:** Includes 12 precision inserts and tools to fix stripped threads across automotive, furniture, and more.
- • **Durable High-Quality Construction:** Crafted from premium materials to guarantee long-lasting, reliable thread restoration.
- • **Universal Fit for 5/16-18 Threads:** Engineered to perfectly restore coarse threads, saving costly replacements and downtime.
- • **User-Friendly with Clear Instructions:** Step-by-step guide ensures even first-timers can confidently execute professional repairs.

## Overview

The Helicoil 5521-5 Thread Repair Kit is a compact, professional-grade solution designed to restore 5/16-18 coarse threads with 12 inserts, a tap, and installation tool. Trusted by mechanics and DIYers alike, it offers universal compatibility, durable materials, and clear instructions to save time and money by repairing stripped threads instead of replacing parts.

## Description

Helicoil 5521-5 5/16-18 Inch Coarse Thread Repair Kit

Review: Saved My Intake Manifold - A screw thread on the thermostat housing had stripped and my choices to repair was get another manifold (replace myself}, remove manifold for much easier access (this is a 318 in a Dodge van) or repair in place. The first 2 were non-starters for the time and effort it would take. With option 3 I had limited space above for the drill to drill out the stripped thread. Fortunately I had a right angle adapter for my drill, but the bit kept locking up. So I found the smallest bit that would fit the hole, started with the next size up and bit by bit (literally) was able to drill the hole to it's proper size for tapping. You'll ultimately need a 21/64" bit for this helicoil set as it's not supplied. Since I had limited space for tapping, using a standard tap holder would not work well at all. So I set on the idea of using a ratchet, fitting a 3/8" socket to it. You will need a 12-point socket, the 6-point won't work properly. Voilà! Tapped hole, helicoil goes in easily, thermostat housing sealed (using "The Right Stuff" -good stuff!), all is well.
Review: you can use this tool to repair a variety of different products - I used it for furniture repair and it worked perfectly no need to go buy a new piece of furniture when you can repair it with this of course you have to know how to use it it's a terrific repair tool I`ve been using them now for about 50 years and it's never failed me

## Features

- The product is 5/16-18Thread RepairKit.Fit Type: Universal
- 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 | B0002SRDUU |
| Best Sellers Rank | #184,546 in Automotive ( See Top 100 in Automotive ) #32 in Thread Spark Plug Thread Repair Kits |
| Brand | Helicoil |
| Customer Reviews | 4.8 4.8 out of 5 stars (464) |
| Date First Available | October 2, 2001 |
| Exterior | Smooth |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3.2 ounces |
| Item model number | 5521-5 |
| Manufacturer | Heli-Coil |
| Manufacturer Part Number | 5521-5 |
| Model | Helicoil 5521-5 5/16-18 Inch Coarse Thread Repair Kit |
| OEM Part Number | 5521-5 |
| Product Dimensions | 4.4 x 0.5 x 3.6 inches |

## Images

![5521-5 5/16-18 Inch Coarse Thread Repair Kit - Image 1](https://m.media-amazon.com/images/I/71PxQ1ZpATL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Saved My Intake Manifold
*by D***O on May 27, 2019*

A screw thread on the thermostat housing had stripped and my choices to repair was get another manifold (replace myself}, remove manifold for much easier access (this is a 318 in a Dodge van) or repair in place. The first 2 were non-starters for the time and effort it would take. With option 3 I had limited space above for the drill to drill out the stripped thread. Fortunately I had a right angle adapter for my drill, but the bit kept locking up. So I found the smallest bit that would fit the hole, started with the next size up and bit by bit (literally) was able to drill the hole to it's proper size for tapping. You'll ultimately need a 21/64" bit for this helicoil set as it's not supplied. Since I had limited space for tapping, using a standard tap holder would not work well at all. So I set on the idea of using a ratchet, fitting a 3/8" socket to it. You will need a 12-point socket, the 6-point won't work properly. Voilà! Tapped hole, helicoil goes in easily, thermostat housing sealed (using "The Right Stuff" -good stuff!), all is well.

### ⭐⭐⭐⭐⭐ you can use this tool to repair a variety of different products
*by J***R on February 3, 2023*

I used it for furniture repair and it worked perfectly no need to go buy a new piece of furniture when you can repair it with this of course you have to know how to use it it's a terrific repair tool I`ve been using them now for about 50 years and it's never failed me

### ⭐⭐⭐⭐⭐ Package came in good shape
*by F***T on January 11, 2026*

The healing coils worked well good product

## Frequently Bought Together

- Helicoil 5521-5 5/16-18 Inch Coarse Thread Repair Kit
- BOSCH CO2148 1-Piece 21/64 In. x 4-5/8 In. Cobalt Metal Drill Bit for Drilling Applications in Light-Gauge Metal, High-Carbon Steel, Aluminum and Ally Steel, Cast Iron, Stainless Steel, Titanium
- Irwin Tools 3016021 Single Cobalt Alloy Steel High-Speed Steel Drill Bit, 21/64" x 4-5/8"

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-10*