American Standard Taper Pipe Thread
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
Torque values are listed in foot-pounds (FT LBS)
| Size Threads/Inch | Tap Drill Size | Decimal Equivalent | Torque – Dry | Torque – Lubricated |
|---|---|---|---|---|
| 1/4″ – 20 | #7 | .201 | 12 | 9 |
| 1/4″ – 28 | #3 | .213 | 14 | 10 |
| 5/16″ – 18 | 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 | 450 |
| 7/8″ – 14 | 13/16 | .8125 | 660 | 490 |
| 1″ – 8 | 7/8 | .875 | 900 | 680 |
| 1″ – 14 | 15/16 | .9375 | 1020 | 760 |