Drilling And Tapping Chart With Answer Key - Battlebots Iq Exercise Page 3
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3An Exercise in Tapping and Drilling, continued.
UNC and UNF Thread Chart for medium sized Machine Screws
Nominal Diameter
Coarse Thread
Fine Thread
UNC
UNF
Threads /Inch
Tap Drill
Threads/Inch
Tap Drill
#5 (.125”)
40
# 38
44
# 37
#6 (.138”)
32
# 36
40
# 33
#8 (.164”)
32
# 29
36
#29
#10 (.190”)
24
# 25
32
#21
#12 (.216”)
24
# 16
28
#14
¼”
20
# 7
28
#3
5/16”
18
F
24
I
3/8”
16
5/16
24
Q
7/16”
14
U
20
25/64
½”
13
27/64
20
29/64
9/16”
12
31/64
18
33/64
5/8”
11
17/32
18
37/64
¾”
10
21/32
16
45/64
7/8”
9
49/64
14
13/16
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