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pokpok said:I would use a 1/4" npt tap right? but i notice there are 1/4"- 18 and 1/4"-20 taps. would it matter which one i would use?
Zordan said:for a 8-32 you need a #29 drill (.1360") for the tap drill
for the tap an 8-32.
clearance holes for 8-32 are between #18 (.1695") - #16 (.1770)
for a 1/4-20, the tap drill is a #7 (.201)
1/4-20 tap
clearance holes between letter F (.257) - letter H (.266)
and for pipe taps
1/4 npt a 7/16" drill for tapping
JFettig said:eek
this is messed, 1/4-20 is 1/4inch screw, 1/4npt is 1/2-18 with a 60some degree taper, much much different
I use 4-40 and 6-32 screws and taps, I have thread forming taps wich use larger holes but make threads TONS easier, and they are pretty much as good. they push the material rather than cut it.