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heli-coil drilling

Discussion in 'The Garage' started by jasonkh2tg, Aug 17, 2003.

  1. jasonkh2tg

    jasonkh2tg 1/2 ton status

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    what size drill will i need for a 7\16" heli-coil and a 1\2" Heli-coil...
     
  2. NITRO

    NITRO 1/2 ton status

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    do u already have the heli coils?? u can buy kits that have everything included in em for pretty cheap.

    NITRO
     
  3. funkycold

    funkycold 1/2 ton status

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    Hope this helps.. /forums/images/graemlins/thumb.gif

    Tap Chart -
    Helicoil Threads

    Tap size ---- Drill size
    2-56 -------- 3/32
    3-48 -------- #33
    4-40 -------- #31
    4-48 -------- #30
    5-40 -------- #30
    6-32 -------- #25
    6-40 -------- #26
    8-32 -------- #17
    10-24 ------- 13/64
    10-32 ------- #7
    12-24 ------- #2
    1/4-20 ------ 17/64
    1/4-28 ------ G
    5/16-18 ----- Q
    5/16-24 ----- 21/64
    3/8-16 ------ X
    3/8-24 ------ 25/64
    7/16-14 ----- 29/64
    7/16-20 ----- 29/64
    1/2-13 ------ 33/64
    1/2-20 ------ 33/64
     
  4. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    The best source for drill size is the tap. Get the tap you need and hopefully you will be able to read on the tap what size you need. You can get wrong info from others that can cause you trouble later. My 7/16" NF tap says on the side "drill size - 25/64"." That is what this one says anyway.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Regular taps are not the same as heli coil taps and they use different size drills, most taps regular or heli coil will give the proper drill size for them though.
     
  6. jasonkh2tg

    jasonkh2tg 1/2 ton status

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    wow thanks for the reply's guys....the (heli-coil) tap chart helped...thanks
     
  7. afroman006

    afroman006 1/2 ton status

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    What is a heli-coil? I have a bunch of heli-coil taps but have no idea what they are for. Thx
     

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