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  #1  
Old 01-09-2019, 03:00 PM
Parkr1942 Parkr1942 is offline
 
Join Date: Oct 2013
Location: Louisville, Ky
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Question 03A3 & A4 Trig Grd Screw Threads/Inch

Did all the makers of A3 and A4 models continue using the oddball 1/4 X 25 tpi guard screws that were supposed to be used on the 03 models because it was standard on the Krag or did they convert to 1/4 X 28 NF American screw threads? Hard to believe they continued using an oddball screw. Makes finding a die/tap to chase the receiver screw holes and screw threads rather difficult and pricey.
Thanks, Parkr1942
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Old 01-09-2019, 03:26 PM
chuckindenver chuckindenver is offline
 
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1903 and A3 as well as U.S. Krag have a 1/4x25 guard screw.. I dont know of anyone else at this time that offers after market screw sets for this size. a tap for this is crazy money as well.
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Old 01-09-2019, 03:28 PM
Jakeroub Jakeroub is online now
 
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Location: Mass
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1/4-25? yuck.

If you just need to clean up the threads, I wonder if an oversized M6x1mm tap would work?
6mm= 0.236
1mm pitch = 25.4 TPI

Oversized taps are often made for machining before plating.

Another option is to make a tap from a screw, but you'd want to find a 1/4-25 screw that is harder than the receiver (good luck with that). Could single point turn one on a lathe I guess.
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Old 01-10-2019, 09:43 PM
chuckindenver chuckindenver is offline
 
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use the right tap for the job..or youll be sorry..
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  #5  
Old 01-10-2019, 10:26 PM
dprice3844444 dprice3844444 is offline
 
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https://www.brownells.com/gunsmith-t...prod17079.aspx

tap here
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  #6  
Old 01-11-2019, 09:44 AM
Parkr1942 Parkr1942 is offline
 
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Thanks gents. Enuff said.
Parkr1942
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Old 01-11-2019, 03:10 PM
Calif-Steve Calif-Steve is offline
 
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Back in early 1900's people would apply for patents on screws. Springfield had to find a screw that had no patent on it. So, odd dimensions ruled.
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03a3 trigger guard screws, trigger guard screws

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