What size drill bit do I need for a 3/8 helicoil?

25/64
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BSW
Insert Size Drill Size Wire Thread Insert Length
1/4-20 6.7 mm 0.750
5/16-18 21/64 0.938
3/8-16 25/64 1.125

What size hole do you drill for a M8 helicoil?

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Metric
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

What size Tap do I need for an m6x1 helicoil?

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

What size drill and tap for a 3/8-16 HeliCoil?

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

What does STI tap mean?

Screw Thread Insert
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 size Tap do I need for a M8 1.25 helicoil?

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

What size Tap do I need for a 10 32 helicoil?

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

Can you tap helicoils?

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.

Can you use regular tap for 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.

How do you tap a helicoil?

Installation Procedure:

  1. Drill out the old threads using the drill size that is recommended on the thread repair kit packaging. The shank of the tap also lists the recommended drill size.
  2. Tap the hole using the Screw Thread Insert (STI) tap.
  3. Install the insert using the installation tool.
  4. Remove the tang of the insert.

What size Tap do I need for a 5/16 HeliCoil?

Tap Size: 5/16-18 STI. Drill Size: 21/64″

How to size helicoil?

Nominal length is a calculated number and cannot be measured in the free state.

  • For Tangless CoilThread inserts,the number of free coils is the total number of convolutions (counted from notch to notch) and has a tolerance of ±1/4 coil.
  • Tangless inserts are available for select UNC&UNF sizes up to 3/8″,and select metric coarse sizes up to M12.

    • What size hole to drill for M8 tap?

    Tap Drill Clearance Drill 75% Thread for Aluminum, Brass,& Plastics 50% Thread for Steel, Stainless,& Iron Close Fit Standard Fit M7 M6 M5 Screw Size (mm) Minor Diameter (mm) M2 M4 M18 M16 M10 M9 M8 M14 M20 53/64 22.0021.00 55/64

    What size drill and tap do I Need?

    – The DMB is the diameter measurement you figured out above, .3125. – The full thread percentage depends on what size thread you want, typically between 70 and 85, but we’ll use 75 for this example. – The other variable, Ni, is the other part of the tap. Let’s use the 5/16″-18 tap, for instance. The Ni for that tap is 18.

    What size hole to drill for 8mm tap?

    Tap Metric Drill US Drill; 3mm x 0.5: 2.5mm-4mm x 0.7: 3.4mm-5mm x 0.8: 4.3mm-6mm x 1.0:

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