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Thread: 5/16" x 36 tpi...

  1. #1
    Boolit Master

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    5/16" x 36 tpi...

    What size drill bit do I use for that tap...

    I can find info on 18 tpi (F) and 24 tpi (I), but not 36 tpi...

    Will the "I" bit work as I have been using a 17/64" and it seems to work O.K.

    But, I was wonder what the actual size bit might be for the tap size...

    Thanks...BCB

  2. #2
    Boolit Master


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    I googled that-found Amazon selling a letter "L" bit for that purpose.
    Micah 6:8
    He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?

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  3. #3
    Boolit Grand Master

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    Look in the machinists hand book. It may list it outright or it gives a formula to calculate tap drill size. Another is to Look at tap makers websites they may have a chart that gives the Tap Drill for 75% threads.

  4. #4
    ADMIN



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  5. #5
    Boolit Buddy
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    Tap dia. minus the reciprocal of the pitch

  6. #6
    Boolit Grand Master



    M-Tecs's Avatar
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    19/64"

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check