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Where to buy 45/64 bit for 1/2-inch NPT Thread Tap

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Steve Garson
Steve Garson Member Posts: 191
in THE MAIN WALL
I just bought a tap at the local plumbing supply house and am amazed to find that almost no one sells the 45/64-inch bit that it requires. Even online! Am I missing something?

What size bits do you guys use when you need to tap a 1/2-inch hole?

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  • Lurker_2
    Lurker_2 Member Posts: 123
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    re

    mscdirect.com

    also if there is a good industrial supply house, or a real hardware store around, they will have one.
  • jim murtaugh
    jim murtaugh Member Posts: 72
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    drill bit

    grainger has them
  • jim lockard
    jim lockard Member Posts: 1,059
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    11/16

    would be the same real close to 45/64 . best wishes J.Lockard
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
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    45/64 is definitely out there in many varieties. HSS and exotics in normal drill bits of full-size and reduced shank, router bits and even high-precision masonary bits for drilling bowling balls!

    Vermont American makes the regular drill bits, but doubt that they're considered "common" stock in most places.
  • dennis_kings
    dennis_kings Member Posts: 6
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    drill bit

    must have your numbers wrong. 45/64 is almost 3/4" Can't run a 1/2 tap through a 3/4" hole. Maybe 25/64 or close to that? Anyway Grainger will have them.
  • tony the tech
    tony the tech Member Posts: 26
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    Drill bit

    45/64 (.7031) IS the correct tap drill size for a 1/2-14 NPT hole. We use an 18 mm drill (.708). It works fine (we make hundreds of 1/2" NPT holes in steel pipe every day)
  • Carl PE
    Carl PE Member Posts: 203
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    Have you tried..

    Enco ?

    I order stuff from those guys all the time. Usually get it in a day or two.

    They have it for $2.99.
  • jim lockard
    jim lockard Member Posts: 1,059
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    The outside

    of the pipe Dennis. 7/8" is the outside diameter +/-. Best Wishes J.Lockard
  • ed_25
    ed_25 Member Posts: 6
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    Fastenal

    Do you have a local fastenal?
  • Wayne_12
    Wayne_12 Member Posts: 62
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    7 corners hardware

    7 corners hardware in St. Paul, Mn. They have more in that store than most tool warehouses. www.7corners.com
This discussion has been closed.

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