Oversize Wire Inserts

Oversize™ Heli-Coil® inserts are an ideal solution for restoring thread insert tapped holes and correcting tapping errors. Whether it's a result of improper installation or crooked holes, mistakes happen – luckily, you can find all your fastener needs at Olander. We are proud to be a Master Distributor of Heli-Coil® and the sole authorized distributor of Heli-Coil® Oversize™ products, offering an extensive collection in a variety of options.

Choose from an array of different sizes, materials, and more, in both inch and metric series, as well as both coarse and fine thread types. We also carry oversized Heli-Coil inserts made of Inconel X, an excellent alternative if you're seeking something suitable for extreme environments. The alloy is stronger than stainless steel and more resistant to high temperatures and oxidation. With so many oversized Heli-Coil options to choose from, our expert sales team is here to help you find exactly what you need.

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Frequently Asked Questions

How are Oversize™ Heli-Coil inserts used to correct tapping errors and restore thread insert tapped holes?

Oversize Heli-Coil inserts are used to correct tapping errors by providing a larger wire cross-section than standard inserts. When an oversize hole is retapped with a special bottoming tap, the Oversize insert can be installed to the proper depth below the top surface. This re-establishes the original internal thread size, allowing the installation of the original size bolt or screw.

Can Oversize Heli-Coil inserts be used to repair stripped STI holes and off-center tapped holes?

Yes, Oversize Heli-Coil inserts offer a greater degree of correction for tapping errors. Twinserts, a type of Oversize insert, can be used to repair stripped STI (Screw Thread Insert) holes as well as off-center STI and standard tapped holes. They are designed to accommodate holes tapped with incorrect diameters and pitches as well.

What materials and size options are available for Oversize Heli-Coil inserts, and how do they differ from standard inserts?

Oversize Heli-Coil inserts are available in various materials such as stainless steel and Inconel X, which offers excellent strength and resistance to high temperatures and oxidation. They come in different sizes, including inch sizes UNC and UNF, as well as metric sizes. The key difference between Oversize inserts and standard inserts lies in their larger wire cross-section, allowing for correction of tapping errors and restoration of thread insert tapped holes.

Are Heli-Coil Oversize inserts approved for use by U.S. Government agencies and major overhaul bases?

Yes, Heli-Coil Oversize inserts, along with Twinserts, have been approved for use by many U.S. Government agencies. For instance, the U.S. Air Force T.O. 44H1-1-117 prescribes their use in maintenance and salvage operations at major overhaul bases. These approvals validate the reliability and effectiveness of Oversize Heli-Coil inserts in critical applications.

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