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Thread: Before I try this thread chasing gimmick, ??

  1. #21
    Boolit Buddy

    Join Date
    Dec 2014
    Quote Originally Posted by PBSmith View Post
    Have a couple of 8-40 scope base threads in a receiver that are slightly messy. Would like to clean them up.
    As others have mentioned (assuming those are blind holes), you'll want a bottom tap, or "bottom" thread chaser.

    Quote Originally Posted by ulav8r View Post
    Also known as cold-forming and fluteless taps
    I've seen a few of those, but always as taper taps, never as a bottom tap.

    If you don't want to make your own thread chaser, and don't want to remove any material, maybe a used, worn, and very dull 8-40 bottom tap would work? (Usual precautions, don't break it, etc.)

  2. #22
    Boolit Buddy
    Join Date
    Nov 2016
    There are such things as thread FORMING taps, maybe not is this size, but I've used them before.
    I think such a tap would work great for re-forming the threads without removing any material.

    Think of it as internal "roll threading"...

  3. #23
    Boolit Buddy

    Join Date
    Dec 2014
    Here it is, 8-40 thread swaging tap. Found on eB*y. (Where else?)
    Click image for larger version. 

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  4. #24
    Boolit Grand Master

    Join Date
    Mar 2013
    Northwest Ohio
    Also keeping mind with the "quick" fix of the screw threads, if it dosnt work then chances are it becomes a major repair. Drilling out a broken screw or worse drilling out larger and plugging then redrilling and tapping holes.

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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