Replacing Helicoil thread inserts
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To repair a damaged thread, you will need a thread repair kit containing various useful tools such as twist drill, special taps, insertion tools for threaded inserts, as well as Helicoil stainless steel thread inserts.

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Depending on the nature of the initial problem and the type of thread, various repair methods are possible. One possible option is a repair kit.

At Gardette, we split thread repair kits into two categories:

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• Thread repair workshop kits
• Thread repair kits by diameter

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When should threads be repaired and with what tools?

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The most common causes of thread breakage include:

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• The screw was screwed in too hard.
• The screw was unscrewed incorrectly or with too much force.
• The screw has rusted in the thread and should be removed carefully using pliers or a drill.
• The base material was so soft that it was not possible to correctly secure the screw.

Whatever your case may be, if the thread is damaged, sheared or deformed, it can be fixed using a thread repair kit!

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Our mixed thread repair workshop kits contain:

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• One HSS twist drill bit
• One HSSG tap
• One thread installation tool
• One tang break punch
• Helicoil thread inserts in the right dimensions

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The different types of Helicoil thread repair workshop kits

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Thread repair workshop kits - Free Flowing

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The classic Helicoil insert, compatible with UNC, UNF, BSW, BSF G (BSP), BA and NPT threads.

Single height kits and three-height kits available. From M2 to M42.

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Thread repair workshop kits - Screw Grip

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The Screw Grip threaded insert offers superior resistance to shocks, vibration and movement. It can be distinguished from other threaded inserts thanks to its red colour. We recommend using it only in applications where high strength is required.

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Thread repair workshop kits - spark plug

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To repair a spark plug thread, it is not necessary to drill a central hole. That's where the HSSG combined drilling and cutting tool comes in - in a single go, the hole is widened by the nose and the thread is cut with an allowance. These thread repair workshop kits for spark plugs are available in four different lengths:

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• M10 x 1.0
• M12 x 1.25
• M14 x 1.25
• M18 x 15

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Thread repair workshop kits - oil drain plug

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To repair an oil drain plug thread, use a twist drill bit to cut through the damaged thread. Then, if necessary, use a countersink bit to widen the hole.

These tools can all be found in our thread repair workshop kits for oil drain plugs, available in three different lengths:

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• M12 x 1.5
• M14 x 1.5
• M16 x 1.5

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Thread repair workshop kits - Pro machine

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The PRO thread repair workshop kits contain Helicoil thread inserts ranging from 1.5 D to 2.5 D in length, perfectly suited to most needs.

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These kits also include a HSS countersink bit and a machine installation tool compatible with cordless screwdriver bits. With the PRO machine thread repair kits, you will be able to screw in your threaded inserts safely and effectively.

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How do you install a threaded insert?

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Our thread insert repairs can be installed manually or using a cordless screwdriver. Here's how:

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1. Start by drilling through the damaged thread using a twist drill bit.
2. Then use a countersink bit to flare out the hole.
3. Use cutting oil to limit heat and to get chips out of the cutting area.
4. Finally, place your Helicoil thread repair insert.
   This procedure can differ depending on the type of tapping (manual or by machine).

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For manual tapping

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• Use the installation / insertion tool for manual assembly.
• Insert the repair thread into the tool in such away that it is firmly in place in the groove.
• Apply slight pressure and screw the thread insert into the assembly thread.

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For machine tapping

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• First, adjust the locknuts to the desired install depth.
• Screw the repair thread onto the tool and insert it into the assembly thread.
• Once the lock nut is in place, set the machine to anti-clockwise rotation so you can unscrew the installation tool.