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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

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📏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?

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