Printable NPT Tap Drill Chart
This one-page NPT chart is for machinists, metalworkers, and shop users who need pipe tap drill sizes at a glance. It lists pipe tap drills for NPT threads in three columns: Size, TPI, and Drill. The rows include common entries such as 1/8 at 27 with drill R, 1/4 at 18 with 7/16, and 3/8 at 18 with 37/64.
Free printable · PDF
- 1 page
- US Letter — choose “Fit to page” for A4
- PDF, 62 KB
Free for personal, family and classroom use.
Need to edit it? The full pack has the editable Excel and Word files plus all 4 sheets — $3.00, one-time.
Your free PDF is downloading. Want all 4 sheets in one download, plus the editable Excel and Word files so you can change the text?
Instant download · 7-day refund · Secure checkout by Stripe
Print it and keep it near the drill press or tapping station. Find the pipe size, check the thread pitch, and match it to the drill size before you tap the hole. This helps you choose the right drill quickly and keep your work organized.
Good for
- Match NPT sizes to drill bits
- Check thread pitch before tapping
- Keep at the drill press
Tip: Print at full size on Letter paper and keep it laminated for shop use.
4 files · PDF, XLSX, DOCX
Get every sheet: Machinist Reference Charts
This sheet plus 3 more in one download, with the editable Excel and Word files. Printable machinist reference set: tap drill and clearance hole chart (inch and metric), NPT pipe tap chart, number and letter drill decimal chart and a thread identification worksheet.
$3.00 USD, one-time 4 files · about $0.75 each
- Instant download
- 7-day refund
- Secure checkout by Stripe
7-day money-back guarantee. Full refund within 7 days of purchase, even after you download.
More free printables
Printable Tap Drill Chart1 page · free PDF
Printable Drill Decimals ChartLetter-size drill decimals chart with number and letter drill sizes in inches, laid out in two columns for quick shop reference.1 page · free PDF
Printable Thread ID WorksheetTwo-page thread ID worksheet with bolt or hole measurements, tap drill, clearance hole, and an answer key for shop use.2 pages · free PDF