Harbor Freight Tools 33684 - Manual (Page 11)

Gear Settings for Various Thread Sizes
SKU #33684 Page 11
Threads Stud Gear Box Threads Stud Gear Box
Per Inch A B C D Per Inch A B C D
12 40 30 38 20 50 60 57
13 40 65 60 30 40 20 50
14 40 35 44 20 55
16 40 40 48 20 60
18 40 45 52 20 65
19 40 50 60 57 56 20 35 30 60
20 40 50 64 20 40 20 40
22 40 55 72 20 45 20 40
24 40 60 76 20 50 30 57
26 40 65 80 20 50 20 40
28 20 35 88 20 55 20 40
32 20 40 96 20 60 20 40
36 20 45 104 20 65 20 40
Example: To cut 12 threads per inch (see illustration below), use 40T in position A, 30T in
position D, and put any other gear is position B to connect A and D.
A
A
B B
D D
Example: To cut 38 threads per inch (see illustration above), use 20T in position
A, 57T in position D, 50T in position B, and 60T in position C.
B C C B
D D
A
A