For Tapping Damaged Internal Metric Threads
Mainly used for repairing Spark plug Threads
For through holes and deep blind holes
No-pre-drilling required
Made from High Speed Steel (M2 Grade)
Straight Threads Completely hardened and ground
As per ISO Standards
Steps to follow to repair your thread Step - 1 Driling :- First the damage thread is cleared with a standard drill. All kits up to 12 mm include correct drill to be used. No pre-dealing is required to repair a spark plug thread, if using the special Spark Plug Tap. Important – for using flute less Taps bigger holes are required.
Step - 2 Tapping :- Special STI (Screw Thread Insert) Taps to be used for cutting the holding thread into the cleared hole. It is recommended to use Suitable branded cutting oil. Note : Thread and pitch of the tap to be checked with the bolt pitch and thread before tapping.
Step - 3 Installling the Insert :- Insert is to be placed on Installation tool and the adjustable ring positioned in a way so that the insert tang is centered in the tang slot. Insert to be winded in with a llight downward Pressure until a half turn below the surface.
Step - 4 Tang Removal :- After finshing the above, Installation tool is to be lifted up and tang is removed using the Tang Break Tool provided in kits up to 12mm. For bigger sizes and spark Plug Taps, Long Nose Pliers Are used for removing the tang. RESULT- THE NEW REPAIRED THREAD IS STRONGER THEN THE ORIGINAL.
We are the Indian manufacturer and supplier of stainless steel wire thread inserts, whereas Helicoil is a foreign based company. A handful of the services we offer are comparable to theirs, yet we differ greatly in many other ways. Our products and services are reasonably priced and of high quality too.
The outer diameter (OD) of a wire insert can only be measured in its free state by first measuring the free coil diameter (FCD) and then counting the number of coils from the notch of the tang to the top of the insert determines its length. The free coil diameter and the number of coils per a specific size insert can be found in the manufacturer’s literature, or generally on their website. Note that wire inserts come in five lengths, each a multiple of the diameter (i.e., 1.0, 1.5, 2.0, 2.5 & 3.0 X diameter) — and that length is the installed length of the insert.
The answer is yes for standard drills but no for tap for wire thread inserts. Wire thread inserts require the use of screw thread insert or STI taps only and standard taps cannot be used for installation of a wire thread insert. However standard drills can be used as per Drill size recommendations will shown in the manufacturer’s literature, typically, on their website. For key-locking inserts, standard taps may be used but the drill and tap combination is not standard. A slightly larger drill size must be used so that the keys of the insert can be driven into the parent material.
Cost is a major factor. Additionally, using a wire thread insert allows for a thread to be repaired maintaining the integrity of the original assembly, meaning that no major additional material is removed from the parent material. When using a key-locking insert, additional material must be drilled out of the parent material to allow for the external threads of the key-locking insert’s outer wall. In cases where space is critical, only a wire insert can be used.
