Thread Size/s:M5x0.8×6.7 mm, M6x1.0x8.0 mm, M8x1.25×10.8 mm, M10x1.5×13.5 mm, and M12x1.75×16.3 mm long SEE: Thread Restoring Files – Pros and Cons Recoil Screw Thread Inserts ( aka Heli-coil or Helical) – Pros and Cons

To install a solid threaded insert, simply drill out the damaged tapped hole with a standard size drill bit which is specified in the Kit Instructions. Or, you can refer to this Tap Drill Chart after identifying the Diameter and Pitch of the Male thread of the insert. E-Z Lok Helical Threaded Insert Kits are a cost-effective option when only one size thread needs to be repaired. This SERIES of E-Z Lok Sets is available in SAE Number sizes #4 to #12 Coarse and Fine series and 1/4″ to 3/4″ Fractional Coarse and Fine Series. NOTE: only ONE thread size per set. When a male or female thread becomes damaged by cross-threading or from impact it can in most cases be restored with the proper tool. The CTA Tools 8240 Universal 53-Piece Thread Restoration Set contains all the tools necessary to restore just about any SAE (Fractional) or Metric size internal or external thread you may encounter.If you don’t own a set of drill bits, visit Best HSS Drill Bit Sets . The only other tool you will need to install a helical insert is a Tap Wrench.

The quality of the tools in this kit is good and the coils are made from stainless steel so they will create a strong, long lasting thread repair.

Some thread restoration kits include a set of thread restoration files with teeth that match specific thread pitches ( distance between threads). A common application would be if a threaded stud or shaft was dropped causing slight flattening of the thread crest. Included in the set is (1) METRIC and (1) SAE Rethreading File for dressing those banged up male threads. If the threads are just flattened out or the crests bent over they can usually be restored to working condition with the proper size thread restoring file. In some cases where the threads were cross-threaded or even seized thread restoring file can the part serviceable again. If you are in a trade or business where you occasionally encounter damaged external threads a thread restoring file set is a must-have tool. Threaded shafts, studs, or bolts can be impossible to use if the threads are damaged. General Tools one of the oldest USA tool manufactures with an extensive range of quality products for professional use.

If you don’t happen to own Metric calibers or scale, measure between the threads and divide the inch measurement by .03937. This number will be the Metric Pitch of the threads. Thread restoration files SHOULD ONLY BE USED where damage is minimal because they remove metal making the thread weaker. Restore stripped threads easily and permanently with Heli-Coil ® thread repair kits and master sets. Heli-Coil ® application-specific thread repair kits make complex repairs manageable and are often the recommended solution by both domestic and foreign automakers.The CO-Z 131 pc Stripped Thread Repair Kit is ideal for repairing damaged or stripped threads that cannot be restored. With recoil screw thread inserts ranging in sizes from M5 to M12 plus all the tools necessary to do a complete installation this is a versatile set to have on hand. When a threaded hole becomes worn or stripped there are two highly effective options for restoring the threads to original holding potential. Recoil Screw Thread Inserts are basically a spring-looking item made with a unique wire that has a cross section resembling a diamond. Heli-Coil is is the name of the company that developed the recoil screw thread insert repair system. Multiple companies now manufacture Recoil Screw Thread Inserts that are basically identical to the Helicoil brand. When correctly installed the provide an new threaded hole that is as strong or stronger than the original tapped hole Cons