DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan

Customer Services

About Us

Customer Support

Desert Online General Trading LLC

Dubai, United Arab Emirates

Helicoil

Q: what size is the tap in this kit???

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?

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?

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?

Yes! As long as there is enough depth to the hole and use the correct coil and screw length.

Product ID: 6253906

Secure Transaction

📏0.375 inch insert length

⚙️1/4-20 coarse thread size

🛠️12 precision inserts

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

Description

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

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

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.

Specifications

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

Have a Question? See What Others Asked

what size is the tap in this kit???

How do I break off the tang?

Can this tap a new hole?

Can these heli-coils be used in a set screw application?

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

A$64

Duties & taxes incl.

Australiastore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews