7-8 ADS TRITON+ Manual
Note: Consider starting the hole using smaller bits to
make pilot holes and increasing up to the final size bit. In
addition, spray cutting oil or another lubricant into the hole
while drilling and tapping.
Drilling the hole in the manhole rim
4. Use a 3/8-inch x 16 threads-per-inch (10-mm) tap that matches
the stud thread to cut threads in the hole. Twist the tap
clockwise ¾ turn, and then back out ½ turn before continuing
deeper.
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