Printable NPT Thread Chart
This one-page NPT chart is for plumbers, machinists, fabricators, and anyone working with tapered pipe threads. It lists common NPT sizes in a clear table with columns for Size, TPI, OD in, OD mm, Tap drill, and DN. Example rows include 1/16 in, 1/8 in, and 1/4 in. The sheet also notes the 1 in 16 taper on diameter and the 60° thread angle.
Free printable · PDF
- 1 page
- US Letter — choose “Fit to page” for A4
- PDF, 52 KB
Free for personal, family and classroom use.
Use it to check thread dimensions before drilling, tapping, or matching fittings. Compare the size, pitch, outside diameter, and tap drill against your part, then follow the DN equivalent when you need metric reference. The layout is simple enough to print and keep near a drill press, bench, or tool box.
Good for
- Check NPT size before tapping
- Match pipe fittings to thread specs
- Keep a quick reference at the bench
Tip: Print at full size so the table text stays easy to read.
4 files · PDF, XLSX, DOCX
Get every sheet: Pipe Thread Reference Pack
This sheet plus 3 more in one download, with the editable Excel and Word files. Printable NPT thread chart, NPT vs BSP comparison chart, tap drill card and a thread identification worksheet.
$3.00 USD, one-time 4 files · about $0.75 each
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Printable NPT vs BSP Chart
Printable NPT Tap Drill Card
Printable NPT Thread ID Worksheet