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Here are a few charts that may come in handy when dealing with fasteners…

American Standard Taper Pipe Thread

Drill Chart

Size Threads/Inch
Tap Drill Size
Decimal Equivalent
1/16″ – 27 D .246
1/8″ – 27 11/32 .3438
1/4″ – 18 7/16 .4375
3/8″ – 18 19/32 .5938
1/2″ – 14 23/32 .7188
3/4″ – 14 15/16 .9375
1″ – 11-1/2 1-5/32 1.1562

Machine Screw Drill Chart
Size Threads/Inch
Tap Drill Size
Decimal Equivalent
0 – 80
3/64
.0469
1 – 64
#53
.0595
1 – 72
#53
.0595
2 – 56
#50
.070
2 – 64
#50
.070
3 – 48
#47
.0785
3 – 56
#45
.082
4 – 40
#43
.089
4 – 48
#42
.0935
5 – 40
#38
.1015
5 – 44
#37
.104
6 – 32
#36
.1065
6 – 40
#33
.113
8 – 32
#29
.136
8 – 36
#29
.136
10 – 24
#25
.1495
10 – 32
#21
.159
12 – 24
#16
.177
12 – 28
#14
.182

Grade 8 Bolt Drill &

Torque Chart in foot pounds

Size Threads/Inch
Tap Drill Size
Decimal Equivalent
Torque – FT LBS. Dry
Torque – FT LBS. Lubricated
1/4″ – 20 #7 .201 12 9
1/4″ – 28 #3 .213 14 10
5/16″ – 24 F .257 25 18
5/16″ – 24 I .272 25 20
3/8″ – 16 5/16 .3125 45 35
3/8″ – 24 Q .332 50 35
7/16″ – 14 U .368 70 55
7/16″ – 20 25/64 .3906 80 60
1/2″ – 13 27/64 .4219 110 80
1/2″ – 20 29/64 .4531 120 90
9/16″ – 12 31/64 .4844 150 110
9/16″ – 18 33/64 .5156 170 130
5/8″ – 11 17/32 .5312 220 170
5/8″ – 18 37/64 .5781 240 180
3/4″ – 10 21/32 .6562 380 280
3/4″ – 16 11/16 .6875 420 320
7/8″ – 9 49/64 .7656 600 460
7/8″ – 14 13/16 .8125 660 500
1″ – 8 7/8 .875 900 680
1″ – 12 59/64 .9219 1000 740
1″ – 14 15/16 .9375 1020 760
Lubricated Includes:

Lubricants – Plating – Hardened Washers

Tap Drills: Allow Approximately

75% Full Thread

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