I’ve got an old Howa 1500 I’m considering building a fun gun around. Now I’m well aware that the tenon threads are M26x1.5mm. Since I hate changing out the gears on my lathe for cutting metric threads I tried looking at the possibility of cleaning them out and cutting imperial threads. A quick google search has some people saying they just opened them up to standard Remington 700 1.0625-16tpi but the numbers don’t make sense to me. Depending on thread tolerances (metric 4H or 6H) the major diameter of the M26x1.5 threads could range from 26mm-26.42mm (1.0236"-1.0402”). So to clean them out the minor diameter of whatever thread I cut could need to be as much as the 1.0402” dimension, which 1.0625-16 3B doesn’t come close to.
So should I just suck it up and stick with metric threads or is worth looking at opening it up to something like 1.085-18tpi 3B with a minor diameter ranging from 1.0249”-1.033”? What experience does anyone have with truing and blueprinting these receivers?
So should I just suck it up and stick with metric threads or is worth looking at opening it up to something like 1.085-18tpi 3B with a minor diameter ranging from 1.0249”-1.033”? What experience does anyone have with truing and blueprinting these receivers?
