Shop reference tools
Printable Drill Tap Chart
Print compact drill, tap, clearance, and pilot-hole sheets for shop use.
Printable Drill Tap Chart lookup
Start with the table, then use the related pages for tapping, clearance holes, pilot holes, and printable shop sheets.
| Thread | Tap drill | Decimal inch | Millimeters | Working note |
|---|---|---|---|---|
| #4-40 UNC | #43 | 0.0890 | 2.26 | Common machine-screw tap size. |
| #6-32 UNC | #36 | 0.1065 | 2.71 | Useful for light machine screws. |
| #8-32 UNC | #29 | 0.1360 | 3.45 | Check thin material and thread depth. |
| #10-24 UNC | #25 | 0.1495 | 3.80 | Coarse #10 machine screw thread. |
| #10-32 UNF | #21 | 0.1590 | 4.04 | Fine #10 machine screw thread. |
| 1/4-20 UNC | #7 | 0.2010 | 5.11 | Common quarter-inch coarse tap. |
| 1/4-28 UNF | #3 | 0.2130 | 5.41 | Fine quarter-inch tap. |
| 5/16-18 UNC | F | 0.2570 | 6.53 | Coarse 5/16 inch tap. |
| 5/16-24 UNF | I | 0.2720 | 6.91 | Fine 5/16 inch tap. |
| 3/8-16 UNC | 5/16 | 0.3125 | 7.94 | Common coarse 3/8 inch tap. |
| 3/8-24 UNF | Q | 0.3320 | 8.43 | Fine 3/8 inch tap. |
| 1/2-13 UNC | 27/64 | 0.4219 | 10.72 | Coarse half-inch tap. |
| 1/2-20 UNF | 29/64 | 0.4531 | 11.51 | Fine half-inch tap. |
| Fastener | Nominal diameter | Close fit | Free fit | Use note |
|---|---|---|---|---|
| #8 screw | 0.164 in | 11/64 in | 3/16 in | Use close fit for alignment; free fit when parts need assembly clearance. |
| #10 screw | 0.190 in | 13/64 in | 7/32 in | A printed or painted part may need the larger free-fit hole. |
| 1/4 bolt | 0.250 in | 17/64 in | 9/32 in | Close fit is common for locating; free fit is easier for field assembly. |
| 5/16 bolt | 0.313 in | 21/64 in | 11/32 in | Check washer bearing area if oversizing the hole. |
| 3/8 bolt | 0.375 in | 13/32 in | 7/16 in | Choose fit based on alignment and coating thickness. |
| 1/2 bolt | 0.500 in | 17/32 in | 9/16 in | Verify against your fastener standard for critical work. |
| Screw | Softwood pilot | Hardwood pilot | Clearance hole | Note |
|---|---|---|---|---|
| #6 screw | 1/16 in | 5/64 in | 9/64 in | Small trim and cabinet hardware. |
| #8 screw | 5/64 in | 3/32 in | 11/64 in | Common wood screw size for general shop work. |
| #10 screw | 3/32 in | 7/64 in | 13/64 in | Use larger pilot holes in dense hardwoods. |
| #12 screw | 7/64 in | 1/8 in | 15/64 in | Useful for heavier fixtures and outdoor work. |
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Where can I find a printable drill tap chart?
This page is built as a browser-printable shop sheet. It includes high-use tap drill rows, clearance holes, and pilot holes without requiring a login or app install.
Printable metric, UNC, and UNF drill tap chart
Use the full tap drill table for metric and inch threads, then print only the pages you need for the bench or tool cabinet.
How do I print a drill tap chart?
Use your browser print command. The print stylesheet removes navigation and keeps the tables compact. For updated values, return to the live chart instead of relying on an old paper copy.