How To Install A Helicoil Video
I'm a Quality Engineer for an assembly line in a manufacturing company. Pretty much all of the components we assemble contain helicoil inserts and there seems to be a massive failure rate. The point of failure is typically as the bolt passes through the helicoils locking feature.
How to Install a Helicoil That Won’t Retract How to Install a Helicoil That Won’t Retract November 4, 2015 No matter the application, if you’re dealing with an assembly that has seen its share of wear and tear, you may come across a stripped thread. When that happens, you should install a helicoil to create a new thread for a fastener to attach to. Here’s how it works: While it’s a great fix, when it comes time to remove the fastener, helicoils that have been in use for a long period of time can retract. My 1949 Ford F-1’s 239 flathead V-8 engine.
It’s a frustrating problem, but one you can avoid. When it came time to repair the header bolts on my 1949 Ford F-1’s 239 flathead V-8 engine, I applied a fix that will prevent the helicoils from backing out.
Here’s what I did: The Solution 1. Drill the stripped hole per manufacturer’s recommendation To start, you’ll need to drill the hole based on instructions provided to you by the manufacturer to ensure a proper fit. The suggested drill bit size will depend on the size of the thread needed, as well as the parent material. Be sure not to drill any deeper than the hole’s original depth. Once the drilling is complete, you’ll also want to rid the hole of any debris by blowing it out with compressed air. Be sure to drill a hole per the manufacturer’s recommendation. 2. Tap the drilled hole with the tap specified in the helicoil kit Tapping is what cuts new threads into your hole.
Be sure the tap is perfectly straight so your threads align properly. Gently turn the tap until you start feeling resistance. Once you do, slowly back the tap out and again blow out the hole with compressed air to get rid of any debris. 3. Apply Threadlocker into the helicoil You might be familiar with LOCTITE 2620 as a red, high-strength threadlocker.
How To Install A Helicoil
In this case, I attached the helicoil to the insert tool provided and then applied LOCTITE 2620 to the outside of the helicoil. I chose 2620 because it is a high-strength threadlocker that can handle the high temperatures the headers will face. Depending on your application, you might choose. LOCTITE 2620, insert tool, helicoil.
Helicoil threaded onto the insert tool with LOCTITE 2620 applied. Insert the helicoil into your freshly-tapped hole With red threadlocker applied, you can now insert the helicoil into your freshly-tapped hole. The cure time for LOCTITE 2620 depends on the temperature at the time of application, but we recommend waiting 24 hours to ensure full strength. The helicoil is installed in the hole with LOCTITE 2620 applied. This will ensure a strong bond that can handle high temperatures. And that’s it!
A helicoil installed with LOCTITE 2620 won’t ever retract if you need to remove the fastener. In short, the answer is yes. LOCTITE 262 is a high-strength threadlocker just like LOCTITE 2620, but can withstand up to 360 degrees F rather than the 650 degrees F LOCTITE 2620 can withstand. I chose LOCTITE 2620 for this reason, and because it tolerates surface contaminants from lubrication, anti-corrosion and protection fluids well. If using LOCTITE 262, just apply it into the fresh cut threads prior to inserting the coil, insert the coil, and let it cure.
Can You Use Form-A-Thread Instead? In some cases has been used as an alternative to helicoils.
This stripped thread repair method restores worn, stripped or damaged threads without drills, tools or inserts. It’s a five minute job, with a finished assembly that allows up to 128 ft. Of torque within a wide temperature range. However, an application assessment should be performed to determine suitability, and keep in mind that even in those instances when Form-A-Thread would be effective, helicoil repairs are always stronger.
Over to You Do you have any questions about installing helicoils? Let us know in the comments, on, or on!
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Applications The HELICOIL ® is used in mechanical engineering and in the electronics, automotive and aerospace industries. HELICOIL ® is also applied in gear housings, exhaust systems, engines and satellites, thread reinforcement, repeated installations, maintenance and repair as well as in lights, electrical appliances, hammer drills and printing presses. HELICOIL ® Plus thread inserts comply with a variety of requirements and industry standards, including those in the aerospace industry, and feature other approvals as well as suitability tests, e.g.
In the field of power plant technology. HELICOIL ® Tangfree – The innovative thread insert with no tang Installed quickly and securely – and no tang to break.
The innovative coil of the insert allows installation from both ends with identical quality. Thanks to the reduced thread on both ends and the coil ends optimised for insertion, the HELICOIL ® Tangfree thread insert can be installed without special alignment. The HELICOIL ® Tangfree is easily screwed onto the mandrel and goes into the pilot thread smoothly. The spring-mounted installation blade grips into the notch of the coil thread insert and securely installs it in the prepared pilot thread.
In addition, the optimised geometry minimises wear on the tools. The tool concept is impressive, boasting long service life for the blades and simple maintenance.
HELICOIL ® Plus Free Running The thread insert with its precision-formed rhombic profile runs through freely turn for turn. The result is an internal thread that is true to gauge and accepts the insertion of a screw at both ends. The dimensional stability of the ISO thread complies with DIN 13 6H, with 4H for special requirements, and meets the requirements of international standard specifications.
The green colour of the HELICOIL ® Plus Free Running simplifies identification even when installed. The advantages of the HELICOIL ® Plus System are particularly apparent with respect to processing and tools, resulting in shorter cycle times. HELICOIL ® Plus Screwlock This thread insert also has an additional screw-locking section.
One or more polygonal threads clamp the flanks of the installed screw. The elastically resilient frictional locking results in prevailing torques. These screw locking torques meet the requirements of technical delivery terms for international standards. The prevailing torques can also be individually adjusted as required for the relevant application, e.g. For securing setting screws. HELICOIL ® Plus Screwlock are only to be used with screws of higher property classes (R m 800 N/mm 2).
In the case of high-alloyed screws, common lubricants should be used in accordance with manufacturer recommendations. The advantages of the HELICOIL ® Plus System are particularly apparent with respect to processing and tools, resulting in shorter cycle times. HELICOIL ® Tangfree Screwlock HELICOIL ® Tangfree Screwlock has the same advantages as HELICOIL ® Tangfree. In addition, there is a screw-locking area. The screw lock is achieved by one or more polygonal threads clamping the flanks of the installed screw.
Helicoil Installation Tool Parts
The elastically resilient frictional locking results in prevailing torques which are comparable with the specifications of ISO 2320. These screw locking torques meet the requirements of technical delivery terms for international standards. HELICOIL ® Tangfree Screwlock are to be used only with screws of higher property classes (starting at 8.8).
Helicoil Install Video
In the case of high-alloyed screws, common lubricants should be used in accordance with manufacturer recommendations. This thread insert is predominantly used in the aviation industry. HELICOIL ® Classic Screwlock This thread insert offers an additional screw-locking section as well.
The elastically resilient frictional locking results in prevailing torques similar to the specifications of ISO 2320. These screw locking torques meet the requirements of technical delivery terms for international standards.
The prevailing torques can also be individually adjusted as required for the relevant application, e.g. For securing setting screws. HELICOIL ® Classic Screwlock are to be used only with screws of higher property classes (starting at 8.8). In the case of high-alloyed screws, common lubricants should be used in accordance with manufacturer recommendations.
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