Quick Answer

You Asked What tap is used for a 10 32 Heli-Coil?

Tap Size: 10-32 STI. Drill Size: 13/64″

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.

What size Tap do I use for a Heli-Coil?

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.

What size Tap do I need for a M10 Heli-Coil?

Tap Size: M10 x 1.5 STI. Drill Size: 13/32″

What size is M8 HeliCoil tap?


Insert Size Drill Size Screw Thread Insert Length
M8 x 1.0 8.20 8.00
M8 x 1.25 8.30 8.00
M9 x 1.25 9.30 9.00

Can HeliCoil be tapped?

you won’t be able to re-tap a helicoil as it’s basically a coil of wire (like a spring with no compression left). It may just need cleaning up a bit though so worth running a tap through carefully as it may have bits of bolt stuck in it.

Is a HeliCoil tap different?

Can a standard tap be used instead? Once installed, the internal threads of the HeliCoil insert are designed for use with standard sizes of fasteners. To work correctly, the spacing of the coils of the HeliCoil wire is installed with the same pitch (spacing between threads) as the fastener for which it is intended.

What are STI taps?

STI (Screw Thread Insert) taps are manufactured to meet the tolerance of standard screw thread inserts. A screw thread insert is the best option for preventing the stripping of threads and Emuge STI taps are designed for screw threaded insert applications in a wide range of workpiece materials.

What’s the point of helicoils?

A HeliCoil is a coiled-wire type of thread repair insert used to create internal screw threads to accommodate standard-sized fasteners. Some of the advantages of using a Helicoil include… A large range of available thread diameters allow for use in a variety of thread repair applications.

What size Tap do I need for a M6 HeliCoil?

It takes a 6.3mm or a 1/4in.

Do helicoils work in aluminum?

Do helicoils work in aluminum? The soft nature of aluminum allows threads to pull from their base material when under the strain and pressure of an operating engine. An installed HeliCoil threaded insert provides a secure threaded connecting point for accessories on engines with aluminum heads.

What size tap do you use for a M6 HeliCoil?

Tap Size: M6 x 1 STI. Drill Size: 1/4″

What size tap do you use for M12 Heli-Coil?

Tap Size: M12 x 1.75 STI.

What size Tap do I use for a 3/8 16 Heli-Coil?

Tap Size: 3/8-16 STI. Drill Size: 25/64″

What size tap do you use for a 1/4 20 Heli-Coil?

Tap Size: 1/4-20 STI. Drill Size: 17/64″

What size is S drill bit?

Drill Bit Size Chart

Size Decimal Equivalent Size
.38 mm 0.015 11/32″
1/64″ 0.0156 8.75 mm
.40 mm 0.0157 8.80 mm
78 0.016 S

What size is an M8 screw?

The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that’s slightly under 8mm which means that the bolt should fit through an 8mm hole.

What size is 11 64 drill bit?

What size is 11 64 drill bit?

Drill Bit Hole Diameters
Metric Size Fractional Size
.9 mm .0354 9/64
1 mm .0394 5/32
2 mm .0787 11/64

Can you install a helicoil without tool?

Yes, the helicoil insert requires a special tap. The insert can be installed without the tool with some jockying. Invariably, if you do not purchase the entire helicoil set, something else will break that’s the same size bolt.

What size Tap do I need for a M8 1.25 helicoil?

Tap Size: M8 x 1.25 STI. Drill Size: 21/64″

What’s better than a helicoil?

Time Sert inserts for head bolt applications are much thicker than the Helicoil brand. They are more like a solid metal bushing which is threaded on the inside and out. The Time Sert brand insert is installed with a special driver.

What keeps a helicoil in place?

How does helicoil stay in place? The HeliCoil insert itself has special threads designed to grab the walls of the part, and the tang is there to help drive the insert into place. Free running inserts are fully rounded inserts that are slightly larger than the hole they install in.

What is an SPI tap?

Screw Thread Insert (STI) taps are used for cutting oversized threads for helical coil screw thread inserts. The insert offers a stronger tapped thread for a balanced distribution of loads.

Whats a tap and an insert?

standard tap?” STI (screw thread insert) taps and standard taps both cut threads into a drilled hole. However, screw thread insert taps cut an oversized thread that forms our E-Z Coil™ helical coil inserts into the desired thread size.

How does a helicoil insert work?

HeliCoil Insert Types

When installed, they grip the walls of the hole through the spring-loaded action. This allows the fastener to easily install and be removed as well. These do not require any special staking or locking.

How does a Keensert work?

How It Works:

  1. A Keensert is a solid threaded bushing-style insert that is available in standard dimension metric and inch sizes.
  2. The insert is provided with keys that lock the insert to the workpiece during installation.
  3. The locking keys are mounted in dove-tail groove features cut into the insert body.

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.

Do HeliCoils inserts come in different lengths?

HeliCoils come in lengths as a function of the diameter of the thread (D). In standard (inch) sizes, standard HeliCoil lengths are 1D, 1.5D, 2D, 2.5D and 3D. In metric, the standard sizes are 1D and 2D (your M14 is available in 2 lengths: 14 and 21 mm).

Are HeliCoils reliable?

The precision and reliability of the HELICOIL® wire thread inserts have been well proven by the demands of the aerospace and defence industries over the decades and are used extensively in some of the world’s most popular and modern airliners.