what actual size is a #79 drill bit?

Discussion in 'HO Scale Model Trains' started by trainsteve2435, Jul 28, 2004.

  1. hello all, can someone tell me what actual size a #79 drill bit is? i cant seem to find one at my local tool store. thanks!
  2. sumpter250

    sumpter250 multiscale modelbuilder

    0.0145"= #79 drill bit diameter
  3. rksstl

    rksstl Member

    Your LHS should be able to set you up. Over the years I've gotten a couple of sets at my LHS. If all else fails any of the ehobbyshops have them.
  4. Tyson Rayles

    Tyson Rayles Active Member

    Micro-Mark is another good source.
  5. 60103

    60103 Pooh Bah

    If you get really stuck, ask your jeweller where he buys his tools.
    Hardware stores rarely stock anything in the sizes we use. They may go down to a #4-40 screw (I think they're used in electrical sockets) but I only found one with #2-56 and I bought a box of a hundred or so -- I'm almost out of them.
  6. RioGrande

    RioGrande Member

    How tiny? Try itsy bitsy!

    Any hobby shop worth their salt will have them, as will train shows and Micro Mark too. Even the "late great" Great American train store in malls had them. Believe it or not, thats where I got mine!
  7. Fred_M

    Fred_M Guest

    And buy more than one because they break pretty easy. Fred
  8. RioGrande

    RioGrande Member

    Truer words were never spoken!

    I've broken a few drilling grab iron holes. Be sure to get a good pin-vise and mount the bit close to the end so that only a little sticks out, that way you'll minimize breakage.
  9. jon-monon

    jon-monon Active Member

    Conversion charts

    Number Sizes

    Letter Sizes

    Most drill sets stop at #60, which in 1/87 is pretty durned big :( There are sets to augment these regular sets that run from #61 to #80. Also you can buy individual drills. Locally, you might check your dremel supplies at the hardware or home improvement store. Dremel has a set, but I don't think it goes that small.

    Here are some suppliers I have not ordered from:


    sets and individual bits - High Speed (HSS) is probably best for most of our uses


    They have small numbered set for under $10, resharpened. Caution: these are carbide, which is very sharp and able to drill hard materials, but it is brittle and probably not suitable for hand held power drills. Maybe OK in a pin vise if you have a steady hand, or a drill press with caution. Break one off in you work and the games over.


    Site is slow as molasis, but the price is right on HSS # bits, 27 to 54 cents range.

    Of course, there's always Harbor Freight if htay have them that small:


    TiN plated is OK, if it's HSS underneath and you sharpen it, it's HSS again instead of TiN. Probably makes no difference when drilling softer materials.

    Cobalt is probably overkill, unless you plan to drill into harder metals. My experiance has been that it's easy to work with, similar to HSS.

    Carbide and carbide tips use with caution.
  10. momac

    momac New Member

    I have found http://www.mcmaster.com/ to be an invaluable source for small screws, drill bits, brass tubing, etc,etc. The site is easy to navigate and their prices for parts are a whole lot less than Micro-Mark, Walthers, or your local hardware store.
    Angus Macdonald
  11. Pete

    Pete Member

    Don't overlook eBay as a source for mini drill bits ;)
  12. Benny

    Benny Member

    Good to know about carbide...it does break, and when I mean break, I mean shatter...I am glad I at least wear glasses, though I wish I wore more with these things...I use them mostly with my drill press, but I have been using them to drill out some metal posts on IMEX trucks...I have evnen shattered large bits drilling out that metal...I bet they would hurt in the eye...
  13. Bill Stone

    Bill Stone Member

    I just posted a drill size chart --- including number, fractional and metric sizes --- in the Technical Q&A section (it's not exactly just an HO question).....

  14. petey

    petey Member

    As you have found, your local tool supplier isn't going to satisfy hobby needs.
    Just looked up the mcmaster site. It's going to take some time to sort through. Wish I was younger.

Share This Page