3/8 BSPT
- Pitch
- 19 TPI
- Reference male diameter
- Not available
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 1.337 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
VALICALC · TECHNICAL REFERENCE
Pipe Thread Reference
Identify a pipe-thread family using its designation, pitch and form. Reference dimensions assist identification but do not establish mating or sealing compatibility.
LOOK UP & COMPARE
Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.
SELECTED REFERENCE
1/2 NPT
- Pitch
- 14 TPI
- Reference male diameter
- 21.14 mm
- Thread form
- Tapered
All fields & cell provenance
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 1.814 mm
- Measurement basis
- Page13, tapered male identification
- Connection: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value 1/2 NPT.
- Pitch: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value 14.
- Reference male diameter: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value 21.14.
- Thread form: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value Tapered.
- Flank angle: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value 60.
- Family: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value NPT.
- Metric pitch: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value 1.81428571429.
- Measurement basis: Swagelok Thread and End Connection Identification Guide — Page13, tapered male identification / 1/2 · verified 2026-10-06 · source value Page13, tapered male identification.
v1.1.0 · verified 2026-10-06
1/2 NPT14 TPIBack to answer ↑
Explore the verified data
18 matching rows · 18 in this subset
| Connection | Pitch | Reference male diameter | Thread form | Actions |
|---|---|---|---|---|
| 3/8 BSPT | 19 TPI | Not available | Tapered | |
| 1/8 BSPP | 28 TPI | 9.73 mm | Parallel | |
| 1/8 BSPT | 28 TPI | 9.73 mm | Tapered | |
| 1/8 NPT | 27 TPI | 10.18 mm | Tapered | |
| 1/4 BSPP | 19 TPI | 13.16 mm | Parallel | |
| 1/4 BSPT | 19 TPI | 13.16 mm | Tapered | |
| 1/4 NPT | 18 TPI | 13.54 mm | Tapered | |
| 3/8 BSPP | 19 TPI | 16.66 mm | Parallel | |
| 3/8 NPT | 18 TPI | 16.98 mm | Tapered | |
| 1/2 BSPP | 14 TPI | 20.96 mm | Parallel | |
| 1/2 BSPT | 14 TPI | 20.96 mm | Tapered | |
| 1/2 NPT | 14 TPI | 21.14 mm | Tapered | |
| 3/4 BSPP | 14 TPI | 26.44 mm | Parallel | |
| 3/4 BSPT | 14 TPI | 26.44 mm | Tapered | |
| 3/4 NPT | 14 TPI | 26.49 mm | Tapered | |
| 1 NPT | 11.5 TPI | 33.14 mm | Tapered | |
| 1 BSPP | 11 TPI | 33.25 mm | Parallel | |
| 1 BSPT | 11 TPI | 33.25 mm | Tapered |
1/8 BSPP
- Pitch
- 28 TPI
- Reference male diameter
- 9.73 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 0.907 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
1/8 BSPT
- Pitch
- 28 TPI
- Reference male diameter
- 9.73 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 0.907 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
1/8 NPT
- Pitch
- 27 TPI
- Reference male diameter
- 10.18 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 0.941 mm
- Measurement basis
- Page13, tapered male identification
1/4 BSPP
- Pitch
- 19 TPI
- Reference male diameter
- 13.16 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 1.337 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
1/4 BSPT
- Pitch
- 19 TPI
- Reference male diameter
- 13.16 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 1.337 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
1/4 NPT
- Pitch
- 18 TPI
- Reference male diameter
- 13.54 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 1.411 mm
- Measurement basis
- Page13, tapered male identification
3/8 BSPP
- Pitch
- 19 TPI
- Reference male diameter
- 16.66 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 1.337 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
3/8 NPT
- Pitch
- 18 TPI
- Reference male diameter
- 16.98 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 1.411 mm
- Measurement basis
- Page13, tapered male identification
1/2 BSPP
- Pitch
- 14 TPI
- Reference male diameter
- 20.96 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 1.814 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
1/2 BSPT
- Pitch
- 14 TPI
- Reference male diameter
- 20.96 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 1.814 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
1/2 NPT
- Pitch
- 14 TPI
- Reference male diameter
- 21.14 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 1.814 mm
- Measurement basis
- Page13, tapered male identification
3/4 BSPP
- Pitch
- 14 TPI
- Reference male diameter
- 26.44 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 1.814 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
3/4 BSPT
- Pitch
- 14 TPI
- Reference male diameter
- 26.44 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 1.814 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
3/4 NPT
- Pitch
- 14 TPI
- Reference male diameter
- 26.49 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 1.814 mm
- Measurement basis
- Page13, tapered male identification
1 NPT
- Pitch
- 11.5 TPI
- Reference male diameter
- 33.14 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 60 °
- Family
- NPT
- Metric pitch
- 2.209 mm
- Measurement basis
- Page13, tapered male identification
1 BSPP
- Pitch
- 11 TPI
- Reference male diameter
- 33.25 mm
- Thread form
- Parallel
More dimensions
- Flank angle
- 55 °
- Family
- BSPP
- Metric pitch
- 2.309 mm
- Measurement basis
- Pages15–16, ISO228/1 straight male identification
1 BSPT
- Pitch
- 11 TPI
- Reference male diameter
- 33.25 mm
- Thread form
- Tapered
More dimensions
- Flank angle
- 55 °
- Family
- BSPT
- Metric pitch
- 2.309 mm
- Measurement basis
- Page13, ISO7/1 tapered male identification
How to use this data
Select the nominal designation and family; compare the manufacturer's male identification diameter, TPI and form. Do not use the reference diameter as pipe inside diameter.
- Nominal pipe size is not measured thread diameter or flow bore.
- Guide dimensions are identification aids, not inspection limits.
CHECK THE METHOD
Worked example
1/2 NPT: 14 TPI, tapered 60° family, guide reference male diameter 21.14 mm.1/2 BSPT is also 14 TPI but 55° and has a different form.
Related calculators
Continue the reference workflow
Common lookup questions
Can I use nominal 1/2 in as a hydraulic bore?
No. Measure or obtain the actual inside diameter for the pipe-flow calculator.
TRACEABLE DATA
Sources, scope & verification
Dataset v1.1.0
Last verified:
Selected 1/8–1 in male-thread identification examples; reference diameters follow the named guide's measurement basis.
Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.
Swagelok Thread and End Connection Identification Guide ↗
Type D · SWAGELOK · MS-13-77, revision H
Selected dimensional product facts only; no catalog text, diagrams, standard tolerances or full paid-standard tables.
Full provenance & artifact record
- Source checked
- 2026-10-06
- Use basis
- bounded-product-facts
- Artifact SHA-256
- 1da15206ed06537bd275858c2686326ae93c681a1be6f4e5d5d9f454e8259d27