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HeliCoil Oversize Insert Kits

HeliCoil Oversize Insert Kits come in numerous nominal thread sizes and offer all the benefits of 
regular HeliCoil screw thread inserts. When HeliCoil Oversize Inserts are installed, the original 
internal nominal thread size is re-established for accepting the original size bolt. 

HeliCoil Oversize Inserts & Twinserts

HeliCoil Oversize Inserts - When to Use

HeliCoil Oversize Inserts are recommended for correcting tapping errors that cause HeliCoil 
assemblies to gauge oversize. Conditions of slight taper or bell-mouth in screw thread insert 
tapped holes are easily corrected. However, when the oversize condition of the hole is beyond 
the corrective range of HeliCoil Oversize Inserts, HeliCoil Twinserts should be used. 

HeliCoil Oversize Insert Kits - Contents

Each HeliCoil Oversize Kit comes with a special Emhart Technologies HeliCoil Oversize Bottoming 
Tap and a quantity of HeliCoil Oversize Inserts. HeliCoil Oversize Inserts are available in standard 
free running and screw lock forms. 

About HeliCoil Twinserts

HeliCoil Twinserts from Emhart Technologies restore damaged holes to the original thread size. As 
the name implies, a HeliCoil Twinsert consists of two HeliCoil inserts - a HeliCoil Twinsert Outer Insert, 
and an Inner Insert. The Outer HeliCoil Twinsert Insert is always free running while the Inner HeliCoil 
Twinsert Insert can be either free running or screw-locking. 

HeliCoil Twinserts are available in numerous nominal thread sizes. 

HeliCoil Twinsert Kit Contents

Each HeliCoil Twinsert Kit comes with a HeliCoil Twinsert Bottoming Tap, a Twinsert Outer Insert 
installation tool, a quantity of HeliCoil Twinsert Outer Inserts, and a tang break off tool for the Outer 
Insert. 

HeliCoil Twinserts - When to Use

HeliCoil Twinserts are used for salvaging incorrectly tapped holes and holes that are stripped, 
off-centre, or damaged. They should be used when the oversize condition of the hole is beyond the 
corrective range of HeliCoil Oversize Inserts.