Imperial Helicoil Inserts

* Above image is not to scale and for measurement explanation only.

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Find a Helicoil

Thread Size & Pitch

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1 (.073)-64
12 (.216)-24
2 (.086)-56
2 (.086)-64
8 (.164)-32
8 (.164)-36
10 (.190)-24
10 (.190)-32
3 (.099)-48
3 (.099)-56
1/4 (.2500)-20
1/4 (.2500)-28
4 (.112)-40
4 (.112)-48
5 (.125)-40
5/16 (.3125)-18
5/16 (.3125)-24
3/8 (.3750)-16
3/8 (.3750)-24
6 (.138)-32
6 (.138)-40
7/16 (.4375)-14
7/16 (.4375)-20
1/2 (.5000)-13
1/2 (.5000)-20
9/16 (.5625)-12
9/16 (.5625)-18
5/8 (.6250)-11
5/8 (.6250)-18
3/4 (.7500)-10
3/4 (.7500)-16
7/8 (.8750)-14
7/8 (.8750)-9
1 (1.000)-14*
1 (1.000)-8
1-1/8 (1.1250)-12
1-1/8 (1.1250)-7
1-1/4 (1.2500)-12
1-1/4 (1.2500)-7
1-3/8 (1.3750)-12
1-3/8 (1.3750)-6
1-1/2 (1.5000)-12
1-1/2 (1.5000)-6
1 (1.000)-12

Length

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tabulated metric helicoil product finder.

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Imperial Helicoil Inserts – Inch-Size Thread Repair

Precision Thread Reinforcement for Aerospace, Automotive & Engineering Applications

Working with imperial fasteners and need a reliable thread repair or reinforcement solution? Our Imperial Helicoil Inserts provide exceptional strength, durability, and vibration resistance for inch-size threaded holes, making them ideal for legacy equipment and global engineering standards.

Manufactured from high-quality stainless steel, Helicoil inserts are formed from diamond-shaped wire to create a resilient 60° internal thread when installed. These inserts are trusted across the aerospace, automotive, defence, and maintenance sectors for their ability to restore damaged threads or strengthen original assemblies — especially in softer materials like aluminium or magnesium.

Available in a wide range of UNC, UNF, and UNEF thread sizes, our imperial Helicoil inserts ensure long-lasting performance in critical environments.

Key Features:

🔩 Inch-size thread repair from #2-56 to 1 1/2-12
⚙️ Restores and reinforces worn or stripped threads
🛠️ Suitable for soft or thin-walled materials
🚀 Used in aerospace, defence, rail, and heavy engineering
✅ Corrosion-resistant and vibration-proof design

Whether you're performing maintenance on imperial components or building to exacting US-based specifications, our Helicoil inserts deliver proven performance and precision every time.

👉 Browse our full range of imperial Helicoil inserts or get in touch for technical advice, size support, or bulk pricing.

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