How much pressure can a helicoil take?

HELI-COIL® Pipe Thread Inserts are precision formed screw thread coils of 18-8 Stainless Steel wire cold rolled into a sharp crescent diamond shaped cross section having a tensile strength in excess of 200,000 psi and a smooth surface of 8 to 16 micro inches.

Is a helicoil strong?

If a thread is "static" i.e. not likely to be done up and undone more than a few times in its lifetime, we would always say a helicoil type thread is the strongest option.

How do helicoils fail?

The point of failure is typically as the bolt passes through the helicoils locking feature. This problem is not limited to any one supplier, thread size, bolt type etc...

How deep should a helicoil go?

Pro Tip – The proper installation depth of a HeliCoil insert is ¼-1/2 turn below the top of the original hole.

Do HeliCoils need special taps?

When preparing a hole to accept a Heli-Coil wire screw thread insert, a Screw Thread Insert or STI tap is used to prepare the hole. The recommended drill is utilized to open the hole to the correct minor diameter. The STI tap is then used to create the proper threads in the piece.

How to Use

Can you run a tap through a helicoil?

The threads made by the tapper used for helicoil is not going to work with the standard size bolts. The taps used are specific STI (Screw Thread Insert) tools. But of course, if you decide the old thread is not too damaged you can use a standard tap and try to fix it.

What's better time SERT or helicoil?

After doing a bit of research it sure seems to me that the Time-Sert is the clear choice for a more full-proof 'permanent" fix. The only advantage to a Helicoil I found, is that it is cheaper. Being in the industry for a little while I have seen time and time again, that cheaper is never better.

Are helicoil inserts strong?

When properly installed, helical inserts create a permanent bond that is stronger than the original bolt fastening. Helical inserts provide a convenient way to repair stripped threads in soft or light materials, such as magnesium, wood, aluminum, plastic, and zinc die castings.

What are HeliCoils made of?

Helicoil® thread inserts are made of austenitic chromenickel steel (minimum tensile strength of 1,400 N/mm²). The rolled thread has a high surface quality. This ensures a high-strength, wear-resistant thread with reduced friction torque.

Are time Serts permanent?

TIME-SERT® PROFESSIONAL SPARK PLUG THREAD REPAIR KITS, PERMANENT RESULTS! THE VERY BEST IN STRIPPED SPARK PLUG THREAD REPAIR KITS ! NOTE: If the hole was previously REPAIRED with Helicoil or save-a-thread style insert.

What is Max locking torque?

So, the maximum locking (prevailing) torque going into the bolt is measured, as is the minimum torque required to remove the bolt. Semantically speaking, the torque value table measures the maximum torque for installation, and the minimum torque for removal.

What is NASM33537?

NASM33537 : INSERT, SCREW THREAD, HELICAL COIL, INCH SERIES, COARSE AND FINE THREAD, STANDARD ASSEMBLY DIMENSIONS FOR. IHS Markit Standards Store.

Can helicoils be replaced?

Re: removing/replacing helicoil

If it was installed properly with Loctite, it may require some heat to break it loose. To install new, chase the threads with the proper tap, clean threads thoroughly and install new insert with Loctite. Let cure overnight before you use.

Can you put a helicoil in cast iron?

In order to tap a hole for a Heli-Coil insert in cast iron, you must make sure you have the right type of milling machine. Cast iron is very hard and when you drill and tap a hole, you must run the machine at a very low speed and feed the tools at a very slow rate to avoid breaking them.

Why do you use helicoils?

HELICOIL® is the preferred choice of many leading engineers worldwide who need to strengthen, reinforce or repair screw threads in soft alloy components. HELICOIL® inserts ensure high-strength threads, transferring forces from flank to flank into the holding thread.

What size tap do I use for a helicoil?

Heli-Coil High Speed Steel Drills are supplied in Master Thread Repair Sets (inch and metric) and all Thread Repair Kits except Spark Plug. All drills fit 1/2 inch chucks. The taps supplied with kits and sets are referred to as STI or Screw Thread Insert taps. These taps must be used for Heli-Coil repairs.