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  1. #1
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    best bit for drilling stainless steel

    I have a stainless tank and I need to drill holes for the fuel sender.I have broke three bits so far and have not gotten a hole drilled.one got red hot,one broke,the last just wore flat.I was using a 7/32nd bit as I was going to use sheet metal screws.so who makes the best small bit?
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  2. #2
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    Cobalt

  3. Likes jas638 liked this post
  4. #3
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    Any HSS drill bit will work for your application… drilling 6 holes will not necessitate the use of a GOOD M42 cobalt bit. (They are easier to break using a hand drill because they are more brittle) The key to drilling is to spin the bit slow… say 250 rpm and no faster (I wont get into drilling speed charts at this point)… oh and make sure you use coolant. Evan WD-40 will work for this or splurge and buy some drill lube.


  5. #4
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    Lube and low speed
    89 charger-93 merc 2.5L 245hp
    Soon to be MAD EFI!



  6. #5
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    thanks I will pick up a few[ha ha] bits tomorrow.will ww Grainger sell cobalt bits?
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  7. #6
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    You can get cobalt bits at Autozone.

    Ló fasz racing
    Joe Horvath

  8. #7
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    thanks again.will be drilling wed stay tuned in lol
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  9. #8
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    got er done cobalt bit,oil and slow speed all with one bit. just amazing thanks
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  10. #9
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    This will sound crazy as shiz, but a plumber I worked with told me to use elmers glue when drilling. My first thought was that he was eating it, but sure as shiz, it worked. Ive used crap dewalt bits for a long time with the glue as a lube, and with any metal, it just flakes off, cant explain how or why. Plus, it does taste kinda good.

    The main error of anyone drilling/cutting stainless is too much speed. high pressure-low speed= fast cut.

    Why is cobalt a better bit?

  11. #10
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    John open the windows in the cabin let in some fresh air
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  12. #11
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    Quote Originally Posted by John S View Post

    Why is cobalt a better bit?
    Cobalt just stays sharper longer then HSS.

    As a trade-off, it is brittle.

  13. #12
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    Cheap cobalt drill bits

    Went to to a tool store today to pick up a few things and saw a 190 piece cobalt drill bit set for 100 bucks.There was alot of items one here could use. a tire rack for the spare 10 bucks.winch cable with hook k7bucks.Check it out Harbour tools.
    THE BEST PART OF LIFE IS SPENT ON THE WATER

  14. #13
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    you get what you pay for.. i have that samed set and its good for a couple hole.. now that samesizes of bits from my snap on dealer i can go as hard or as fast as i want with their thunder bits and at most ill bloody a knuckle when the bit comes through the meterial.. but i use bees wax or cutting oil to drill with. their thunder bits are about the only bit that will drill out broken taps

    4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she


    things that were are no longer as they are today...

  15. #14
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    drill

    if you have a drill press or a mill go with a carbide drill or hss drill are you center drilling the holes first stainless is tough not hard so its need alot of tool pressure to cut it low rpm and oil of some kind

  16. #15
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    If you're too fast and/or dull bit, and don't finish the hole , the local heat you generate will "work harden" the area and then it's exotic material time.

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