TM 9-3419-234-14&P
left-hand threading
f.
For cutting left-hand threads, left-hand chaser
holders are required. The same chasers employed for
right-hand threading can also be used for cutting left-hand
merely by grinding the proper cutting angles on the
opposite end of the chaser.
The same set of chasers used to cut right-hand threads
Fig 43
can be turned to cut left-hand threads.
31
