What size drill bit for 2-56 tap?

[Steve Shannon]

Now I feel challenged to make threaded holes work.

At the very least just thread the outer wall. Leave the inner wall drilled slightly larger so you can just push the broken piece out. Trying to unscrew it can be a bugger.

 

[mtnmanak]

At the very least just thread the outer wall. Leave the inner wall drilled slightly larger so you can just push the broken piece out. Trying to unscrew it can be a bugger.

Great tip, however, IF you want to tap both walls, another tip is to just use much longer shear pins. I just get 1/2" long pins now (or longer when I get up to 6-32 pins). That gives you plenty of shear pin protruding inside the tube to grab and twist out. Longer shear pins don't cost more, so why try to work with a 1/4" pin? Even a 3/8" pin for 2-56 is easier to work with than 1/4".

 

[Zbench]

You can always consult this handy chart or many of the others just like it:

https://www.americanfastener.com/tap-and-drill-size-chart/

 

[Troy3003]

I clearance drill the outside wall and use 4-40 pem nuts on the inside tube. I just enjoy the struggle I guess.

 

[OzHybrid]

At the very least just thread the outer wall. Leave the inner wall drilled slightly larger so you can just push the broken piece out. Trying to unscrew it can be a bugger.

To unscrew broken threaded shear pins, heat up the end of a small head flat blade screw driver and push it into broken screw. Wait a couple of seconds till it melts a slot and cools. Unscrew.

 

[David Schwantz]

Yeah I tried that when I was a newbie. Screwdriver kept coming out of the tiny plastic head, scratching my paint-jobs.After second time, I enlisted a large screwdriver "handle" to just tap 'em in.

By the way Chad, flew some of those F-39's at the last launch & they worked just like new... surprising , considering they were made in '99. Thanks again.

https://www.mcmaster.com/products/screws/socket-head-screws~/plastic-socket-head-screws/
Try these.