Helicoil Tap Guide
HELICOIL® plus repairing of damaged threads. Contents Page Applications for thread repair with HELICOIL. Special HELICOIL®plus screw tap. For checking. This is an overview of Helicoil Thread Inserts in industrial repair applications including a. Why does the installation of a HeliCoil require the use of an STI tap?
You are just about finished with your most recent maintenance project, one more bolt to tighten and. Dang it, wouldn’t you know the threads just blew out in the cylinder head. You remove the bolt and it is coated with aluminum, which means that the threads in the head are stripped, not the bolt. Now you are in for work.
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Stripped threads are rarely any fun, but they are a part of working on vehicles. If you only lost the top one or two threads, you can get by, but if it goes any deeper than that, you need to restore it. That’s when knowing how to install a Helicoil insert comes in handy. Fixing Stripped Threads.
The components of a Helicoil kit are the inserts, a special tap and the installer too. You need to provide the drill bit for most kits. In this instance, a is not going to cut it, the threads are wasted and while you might be able to get a little bite with a tap, it won’t last. The best bet is to repair the threads with a insert. A HeliCoil is a coiled threaded insert that installs into the part, providing the correct threads for the original fastener.
There are several types of thread repair inserts, but the most common is the tanged insert. These inserts have a diamond-shaped cross section with 60-degree threads on the inside and specially designed threads on the outer ring, which grips the walls of the hole. HeliCoil Insert Types. The HeliCoil insert itself has special threads designed to grab the walls of the part, and the tang is there to help drive the insert into place.
Free running inserts are fully rounded inserts that are slightly larger than the hole they install in. When installed, they grip the walls of the hole through the spring-loaded action. This allows the fastener to easily install and be removed as well.
Helicoil Insert Specifications
These do not require any special staking or locking. Screw locking inserts have a series of flat spots on the spiral threads, which put pressure on the fastener, holding it in tight. They are reusable, and still maintain their grip on the fastener. How To Install A HeliCoil Insert Installing a HeliCoil insert requires drilling out the original hole to match the new coil, tapping the hole for the coil, installation, and tang removal. You can purchase the inserts or in. You need a master kit for the size of threads you are working with if you do not have a tap and die set.
Pro Tip – The proper installation depth of a HeliCoil insert is ¼-1/2 turn below the top of the original hole. Remove the fastener from the hole. Inspect the hole and make sure the threads are damaged. Use a little brake cleaner or compressed air to blow out the hole.
Using the handle for the tap, we installed the insert. You can use a light thread locker, but it is not necessary, the insert is designed to hold itself in place.
Fine thread – Install the HeliCoil insert into the pre-coil tool. This tool compresses the insert to the correct size. Thread the install tool into the insert inside the pre-coil body. Spin the installer tool until it is fully threaded.
Hold the pre-coiled assembly to the hole being repaired. Thread the installer tool so that the insert threads out of the pre-coiler and threads directly into the repaired hole until it reaches the proper depth and remove the installer tool. At this point, the insert is installed, but the job is not over. For all tanged inserts, the tang must be removed. Using a that fits snugly into the insert, place the punch into the insert until it reaches the tang. Hit the punch with a.
Helicoil Tap Dimensions
This should pop the tang off. Use a magnet or tweezers to remove the tang. The tang can be removed with a pair of needle-nose pliers. HeliCoils do not require thread sealants or thread locker in order retain the insert, but if you feel the need to use sealant or thread locker, a light coating may be applied to the outer threads, making sure the inner threads are clean.
Helicoil Taps Specification
Once installed, HeliCoil inserts are very reliable and trustworthy. They have been used for high-performance applications under high stress, they perform very well in most situations. Check out all the available on or trust one of our 17,000 for routine maintenance and repairs. For more information on HeliCoil thread inserts, chat with a knowledgeable expert at your local.
Jefferson Bryant A life-long gearhead, Jefferson Bryant spends more time in the shop than anywhere else. His career began in the car audio industry as a shop manager, eventually working his way into a position at Rockford Fosgate as a product designer. In 2003, he began writing tech articles for magazines, and has been working as an automotive journalist ever since. His work has been featured in Car Craft, Hot Rod, Rod & Custom, Truckin’, Mopar Muscle, and many more. Jefferson has also written 4 books and produced countless videos. Jefferson operates Red Dirt Rodz, his personal garage studio, where all of his magazine articles and tech videos are produced.