6 inch NPT Thread Dimensions — ASME B1.20.1
6 inch (DN 150) to ASME B1.20.1: Threads — per inch 8 mm; Pitch 3.175 mm; Pipe OD 168.28 mm; Hand-tight 24.33 mm; Effective thread 38.42 mm.
Key to dimensions
6 inch NPT Thread Dimensions — ASME B1.20.1 — all dimensions
NPT basic thread dimensions
| Dimension | Value | Equivalent |
|---|---|---|
| Threads — per inch | 8 mm | 0.315 in |
| Pitch | 3.175 mm | 0.125 in |
| Pipe OD | 168.28 mm | 6.63 in |
| Hand-tight — L1 | 24.33 mm | 0.958 in |
| Effective thread — L2 | 38.42 mm | 1.51 in |
| Pitch dia at end — E0 | 163.731 mm | 6.45 in |
| Pitch dia at hand-tight — E1 | 165.252 mm | 6.51 in |
| Tap drill — mm, approx. | 161.13 mm | 6.34 in |
Values are nominal, from NPT Thread Dimensions — ASME B1.20.1. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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FAQ
6 inch NPT Thread Dimensions — ASME B1.20.1: common questions
What are the 6 inch NPT Thread Dimensions — ASME B1.20.1?
6 inch (DN 150) to ASME B1.20.1: Threads — per inch 8 mm; Pitch 3.175 mm; Pipe OD 168.28 mm; Hand-tight 24.33 mm; Effective thread 38.42 mm.
Does Teshi Group manufacture 6 inch forged fittings?
Yes. Teshi Group is an OEM manufacturer in India of forged fittings to ASME B1.20.1, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the 6 inch dimensions as a PDF?
Yes. Use “Download PDF for this size” on this page to get a single-size, print-ready PDF with the drawing and every tabulated dimension, or download the full NPT Thread Dimensions — ASME B1.20.1 chart.
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Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
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