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With over 65 years of experience, Heli-Coil (a Stanley Engineered Fastening brand) has been manufacturing a wide array of wire inserts and related assembly or installation tools. These Heli-Coil tools are ideal for plating material, bolting, joint locking & unlocking, exhaust systems, hammer drills, gear housing and printing applications in the automotive, defence, electronics, oil & gas, power generation and aerospace industries. Read More






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Thread InsertView all

  • Free Running Helical Inserts

    Helicoil free running inserts are used to make threads or repair worn threads inside tapped holes and are suitable for offering reliable threading in metals, composites, wood & similar materials. These inserts are usually larger in diameter than tapped holes and are compressed while being inserted, thereby providing maximum surface contact area.

  • Locking Helical Inserts

    Helicoil locking helical inserts are installed into printing presses, gear housing & exhaust systems to create an internal screw thread for installing fasteners in automotive manufacturing & maintenance applications. They have a screw locking design to avoid screw loosening upon installation.

  • Thread Inserts

    Helicoil thread inserts are used for repairing damaged internal threads or creating new threads in a tapped hole, in workpieces made of cast iron, carbon, aluminium, magnesium, stainless steel or plastic. They feature a flexible design for balanced distribution of static & dynamic loads throughout the length of the thread.

  • Helical Thread Repair Kits

    Helicoil helical thread repair kits are ideal for repairing tapped holes in metal, damaged or stripped due to over-torque / wear / corrosion. They are equipped with a hand drill & installation tool for quick maintenance and a protective carry case for safe storage & easy portability.

  • Helical Thread Insert Tools

    Helicoil helical thread insert tools are used for installing threaded inserts into a pre-drilled hole. A wide range of insert installation tools, STI plug taps, tang breaking tools and bushings is also available. These tools feature threading on the external surface to create a secure connection with the inserts and a handle for easy manoeuvring inside the drilled hole.

  • Thread Insert Tool Accessories

    Helicoil offers replacement blades, adaptors, nylon pads, hi-torque tools, plier tools, thread adaption assemblies and expandable tools for replacing / repairing your damaged thread insert tools.

About Helicoil

Heli-Coil helical inserts are used to create internal screw threads that can accommodate standard sized fasteners. The Heli-Coil product catalogue comprises screw thread inserts (both standard and screw locking design), working gages, cordless insert installation kits, hand & pipe taps, thread repair kits (standard and master), complete gages and mandrel tools. Heli-Coil thread repair kits contain 4 to 36 tools that are made from durable 304 stainless steel. They include UNF, MC, MF & UNC type thread inserts, along with a hand drill & an installation tool. HeliCoil screw locking inserts feature a resilient locking mechanism that securely grips the bolt and prevents its loosening due to vibrations or heavy impacts. These inserts comply with NASM8846, MA1565, NASM21209 and MA3331 standards. The brand's inch inserts are dyed red for quick identification and ease of operation. Choose from a wide range of Heli-Coil products, including inserts, power tool adapters, power supplies, tool drivers and more, on Raptor Supplies.

Things To Consider

Cross-Reference Alternatives

Heli-Coil's MPNs (manufacturer's part numbers) generally cross individual references to the equivalent Chrislynn model numbers. So, if you are looking for competitor helical tools that are either out of stock or obsolete, chances are Raptor Supplies has the equivalent Heli-Coil inserts and tools available. Customers can also cross reference most of these tools using the last 5 digits of the model numbers.

Why Us?

Raptor Supplies, a trusted Heli-Coil insert distributor, offers its complete range of products, including accessories like pneumatic replacement parts, machine cutting tools, cordless tool batteries, measuring tools and power supplies. We can recommend suitable helical wire insert configurations for accommodating fasteners of various sizes.


These Heli-Coil thread inserts are small in size and require compact packaging. Hence, they are delivered in packs consisting of several pieces. These Heli-Coil thread inserts and tool accessories are delivered by courier shipment and not air freight for minimum downtime.

Major Trade Names

Heli-Coil Tangless Screw Thread Inserts

Heli-Coil tangless screw thread inserts are available in free running and screw locking insert types. These inserts can anchor permanently in position against the tapped hole (free running) and positi...Read more 

Heli-Coil Oversize & Twinsert Screw Thread Inserts

Heli-Coil helical inserts are available in oversize and twinsert helical types. They are ideal for restoring screw thread insert tapped holes as well as for correcting tapping errors to standard tappe...Read more 

Heli-Coil Primer-Free Coated Inserts

Heli-Coil Primer-Free inserts are designed to be used in applications where galvanic corrosion may occur between different metals. They are also ideal for magnesium and aluminium applications. The pri...Read more 

Helicoil Competitive Advantages

Heli-Coil 8 Pitch Screw Thread Inserts

Heli-Coil 8 pitch screw thread inserts are a unique series of inserts, ideal for 8 pitch threaded holes. These inserts are fast and economical units, saving valuable and expensive parts (that would otherwise need to be scrapped) with minimum downtime. The wire cross section of these Heli-Coil 8 pitch inserts is precisely engineered to eliminate the pitch diameter of a standard 8 pitch tapped thread by exactly 1/8 inch and does not require any special taps. These Heli-Coil 8 pitch insert units can be used in existing flanges and bosses, where repairs are impossible with other types of solid bushings or inserts. They are available in inconel X-750 and 18-8 stainless steel variants.

Heli-Coil Self Tapping Screw Thread Inserts

Heli-Coil self tapping wire screw thread inserts guarantee a greatly versatile and inexpensive method of placing strong threads in fibrous materials, including wood. These Heli-Coil inserts are precisely formed to a diamond-shaped cross section configuration and a helically wound coil of carbon steel constructed wire, ensuring thread wear protection. Moreover, the outside design of the coil has knife-like threads which automatically tap themselves in to allow utmost penetration into the wood fibres, yet leaving major sections of wood between the threads for supreme strength. This improves joint strength in both face & end grain installations.

Heli-Coil Pipe Thread Inserts

Heli-Coil pipe thread inserts are precision-formed screw thread coils that are cold-rolled into a sharp crest diamond shaped cross section design ensuring tensile strength under all operating conditions (even at pressures up to 20000 psi). They are made of 18-8 stainless steel wire to resist corrosion and offer a smooth surface of 8-16 micro inches. These economical Heli-Coil pipe thread inserts minimise thread failure due to vibration, stripping, corrosion, fatigue or seizing. Furthermore, these units prevent thread wear, even after repeated reassembly and disassembly.

Heli-Coil Spark Plug Screw Thread Inserts

Heli-Coil spark plug screw inserts are ideal for high performance and high temperature spark plug applications. These thread inserts are made from 18-8 round stainless steel wire to resist corrosion and are designed into a 60 degree diamond shaped wire. This cold worked wire is wound into a helical coil with the help of a notch and driving tang to eliminate it after the insert is screwed into the helical tapped hole. These economical units are capable of reducing thread failure due to vibration, stripping & fatigue, and are ideal for extending thread life, even after repeated reassembly and disassembly.

Frequently Asked Questions

What is a Heli-Coil used for?

A Heli-Coil is a coiled wire type of thread repair insert that is used to create internal screw threads to accommodate standard sized fasteners.

Do Heli-Coils work in aluminium?

When under the strain and pressure of an operating engine, the soft nature of aluminium metal permits threads to pull from their base material. So, an installed Heli-Coil threaded insert, on engines, ensures a secure threaded connecting point for accessories having aluminium heads.

What material are Heli-Coils made of?

Heli-Coil thread inserts are constructed of austenitic chromenickel steel having minimum tensile strength of 1400 N/ These rolled threads ensure a wear resistant and high strength thread surface, with minimal frictional torque.

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