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HELI-COIL 5521-24 Thread Repair Kit: Free-Running - Insert & Tool Kits
HELI-COILInsert & Tool Kits

HELI-COIL 5521-24 Thread Repair Kit: Free-Running

The HELI-COIL Thread Repair Kit (MPN 5521-24) is a tanged tang style insert and tool kit for repairing damaged threads in metal. This free-running, 18-8 stainless steel kit includes helical inserts with a coarse 1…

SKU 3G-OTH-528111

Also listed as: 552124 · 5521 24

Brand
HELI-COIL
Item
5521-24 Thread Repair Kit: Free-Running
Part Number
5521-24
Category
Insert & Tool Kits
Available to Order
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

HELI-COIL
Manufacturer Part Number
5521-24
Type
Free-Running, Stainless Steel
Finish Type
Plain
Thread Size
1 1/2"-6
Thread Type
Coarse
STI Tap Size
1-1/2"-6
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
Insert Types Included
Helical Inserts
System of Measurement
Inch

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HELI-COIL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HELI-COIL Thread Repair Kit (MPN 5521-24) is a tanged tang style insert and tool kit for repairing damaged threads in metal. This free-running, 18-8 stainless steel kit includes helical inserts with a coarse 1 1/2"-6 thread size, right-hand thread direction, and a matching STI tap size of 1-1/2"-6.

Frequently Asked Questions

What is the HELI-COIL Thread Repair Kit 5521-24 used for?

The HELI-COIL 5521-24 kit is used to repair damaged internal threads in metal components. It installs 18-8 stainless steel helical inserts to restore a 1 1/2"-6 coarse thread, making it ideal for industrial maintenance across machining, power transmission, and other heavy equipment.

What are the specifications of the HELI-COIL 5521-24 thread repair kit?

This kit includes free-running, tanged tang style helical inserts in 18-8 stainless steel. It has a 1 1/2"-6 coarse thread size, right-hand thread direction, and a matching STI tap size of 1-1/2"-6. It is compatible with metal substrates and uses inch system measurements.

Where to buy the HELI-COIL 5521-24 thread repair kit worldwide?

3G Electric supplies the HELI-COIL 5521-24 thread repair kit worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this kit to your facility. Contact us to order and arrange delivery to any international location.

How to install a HELI-COIL thread insert from the 5521-24 kit?

To install, drill out the damaged thread to the specified size, tap the hole using the included STI tap (1-1/2"-6), then insert the helical coil using the tang driver. Break off the tang after installation. Always follow the manufacturer's instructions for proper torque and depth.

Used in

Common applications for HELI-COIL
Aerospace — Tangless screw-locking HELI-COIL inserts in 18-8 stainless steel for vibration-resistant threaded joints in airframe and engine components.
Automotive — Free-running tanged HELI-COIL inserts in metric sizes for repairing stripped threads in aluminum engine blocks and transmission housings.
Industrial machinery — STI taps and prewinder installation tools for on-site repair of threaded holes in cast iron and steel machine frames.
Oil and gas — Nitronic 60 HELI-COIL inserts for galling resistance in stainless steel valve bodies and pump housings exposed to corrosive media.
MRO and maintenance — HELI-COIL thread repair kits containing inserts, drill, tap, and installation tool for restoring damaged threads without replacing the parent component.
Electrical equipment — Screw-locking tangless HELI-COIL inserts for securing fasteners in metal enclosures and control panels subject to vibration.
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HELI-COIL Products

3G Electric supplies HELI-COIL insert & tool kits. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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