Tired of leaky hoses and frustrating mismatches? Our comprehensive Hose Thread Size Chart shows you exactly which hose fits your specific needs. From garden hoses to pressure washers, find the perfect connection every time!
While garden hoses come in various inner diameters (⅜”, ½”, ⅝”, and ¾”), the threads on the couplings are standardized for easy connection.
Standard Thread:
Name: American National Standards Institute (ANSI) standard for garden hose fitting thread size
Designation: ¾”–11.5 NH or NHR
Description: This is the one standard size for threads on both male (hose end) and female (spigot end) connectors in North America.
Details:
Fire hose threads are more complex than garden hose threads, with several variations in size and design. Here’s a breakdown to help you navigate fire hose thread sizes:
Standard Fire Hose Thread:
| Abbreviations | |
|---|---|
| NPTF | National Pipe Tapered Fuel |
| NPSM | National Pipe Straight Mechanical |
| ISO | International Standards Organization |
| SAE | Society of Automotive Engineers |
| JIC | Joint Industrial Council |
| NFPA | National Fluid Power Association |
| BSP | British Standard Pipe |
| DIN | Deutsche Industrial Norme |
| JIS | Japanese Industrial Standard |
| BSPT | British Standard Pipe Tapered |
| BSPP | British Standard Pipe Parallel |
National Pipe Tapered Fuel (NPTF) threads are a type of pipe thread standard designed for creating a leak-proof seal for liquids and gases, particularly fuels and oils.
Key Characteristics of NPTF threads:
NPTF threads are commonly used for fuel and hydraulic connections. Here’s a chart listing common sizes:
| Inch Size | Dash Size | Threads per Inch (TPI) | Male Thread O.D. (in) | Female Thread O.D. (in) |
|---|---|---|---|---|
| 1/16 | – | 27 | 0.3125 | 0.2611 |
| 1/8 | – | 27 | 0.405 | 0.401 |
| 1/4 | – | 18 | 0.540 | 0.534 |
| 3/8 | – | 18 | 0.675 | 0.641 |
| 1/2 | – | 14 | 0.840 | 0.821 |
| 3/4 | – | 14 | 1.050 | 1.036 |
| 1 | – | 11.5 | 1.315 | 1.291 |
| 1¼ | – | 11.5 | 1.660 | 1.636 |
| 1½ | – | 11.5 | 1.900 | 1.876 |
| 2 | – | 11.5 | 2.375 | 2.351 |
National Pipe Straight Mechanical (NPSM) threads provide a mechanical connection for pipes, typically requiring an additional sealing mechanism like an O-ring for leak prevention. Here’s a breakdown of NPSM threads:
Function:
Dimensions:
Here’s a National Pipe Straight Mechanical (NPSM) Thread Size Chart with common sizes, including Inch Size, Threads per Inch (TPI), Male Thread O.D. (Outer Diameter), and Female Thread I.D. (Inner Diameter).
Note: Dash size is not used with NPSM threads.
| Inch Size | Threads per Inch (TPI) | Male Thread O.D. (in) | Female Thread I.D. (min) (in) |
|---|---|---|---|
| 1/8 | 27 | 0.397 | 0.358 |
| 1/4 | 18 | 0.526 | 0.468 |
| 3/8 | 18 | 0.662 | 0.603 |
| 1/2 | 14 | 0.823 | 0.747 |
| 3/4 | 14 | 1.034 | 0.958 |
| 1 | 11.5 | 1.293 | 1.201 |
| 1¼ | 11.5 | 1.638 | 1.546 |
| 1½ | 11.5 | 1.877 | 1.785 |
| 2 | 11.5 | 2.351 | 2.259 |
| 2½ | 8 | 2.841 | 2.708 |
| 3 | 8 | 3.467 | 3.334 |
| 4 | 8 | 4.466 | 4.333 |
| 5 | 8 | 5.528 | 5.395 |
| 6 | 8 | 6.585 | 6.452 |
JIC 37° Flare (SAE J514) is a type of fitting commonly used in hydraulic systems. It utilizes a 37° flare on the male fitting that seals against a matching female flare seat. The straight threads hold the connection together mechanically.
JIC 37° Flare fittings come in various sizes designated by a dash number, which corresponds to the tubing outside diameter (OD). Here’s a table outlining some common JIC sizes and their corresponding dimensions:
| Dash Size | Inch Size | Thread | Male Thread OD (mm) | Male Thread OD (in) | Female Thread ID (mm) | Female Thread ID (in) |
|---|---|---|---|---|---|---|
| 2 | 1/8 | 5/16-24* | 7.9 | 0.31 | 6.9 | 0.27 |
| 4 | 1/4 | 7/16-20* | 10.3 | 0.41 | 9.3 | 0.37 |
| 6 | 3/8 | 1/2-18* | 12.7 | 0.50 | 11.7 | 0.46 |
| 8 | 1/2 | 9/16-18* | 16.7 | 0.66 | 15.7 | 0.62 |
| 10 | 5/8 | 3/4-16* | 19.1 | 0.75 | 18.1 | 0.71 |
*Note that most SAE J514 threads have the same dimensions as SAE 45° flare threads, except for the crucial difference in the flare angle. It’s important not to interchange these two types of fittings due to their incompatibility.
SAE 45° Flare (SAE J512) is another popular fitting standard used for low-pressure applications like refrigerant and fuel lines. Similar to JIC 37° Flare, it utilizes a flared connection for sealing but with a 45° angle on the male fitting, instead of 37°.
Here’s what you need to know about SAE 45° Flare thread sizes:
Sizing: SAE 45° Flare fittings use a combination of a dash size and a nominal tube diameter (in inches) to designate size. The dash size corresponds to the tubing outside diameter (OD).
Thread Specifications: The threads themselves conform to the Unified National Coarse (UNC) thread standard, with specific thread sizes for each fitting.
Here’s a table summarizing some common SAE 45° Flare sizes:
| Dash Size | Nominal Tube Size (in) | Threads per Inch | Male Thread OD (in) |
|---|---|---|---|
| 2 | 1/8 | 24 | 0.625 |
| 4 | 1/4 | 20 | 0.812 |
| 6 | 3/8 | 18 | 1.000 |
| 8 | 1/2 | 14 | 1.313 |
| 10 | 5/8 | 14 | 1.625 |
| 12 | 3/4 | 14 | 1.938 |
Important Note: While some SAE 45° Flare fittings share the same thread dimensions as JIC 37° Flare (sizes 7/16-20, 1/2-20, 3/4-16 & 7/8-14), they are not interchangeable due to the different flare angles (45° vs 37°). Make sure to use the correct fitting type for your application.
For a more comprehensive list of SAE 45° Flare thread sizes and specifications, you can refer to resources like the SAE J512 standard or online thread charts provided by fitting manufacturers.
SAE 45° Flare (SAE J512) is another popular fitting standard used for low-pressure applications like refrigerant and fuel lines. Similar to JIC 37° Flare, it utilizes a flared connection for sealing but with a 45° angle on the male fitting, instead of 37°.
Here’s what you need to know about SAE 45° Flare thread sizes:
Sizing: SAE 45° Flare fittings use a combination of a dash size and a nominal tube diameter (in inches) to designate size. The dash size corresponds to the tubing outside diameter (OD).
Thread Specifications: The threads themselves conform to the Unified National Coarse (UNC) thread standard, with specific thread sizes for each fitting.
Here’s a table summarizing some common SAE 45° Flare sizes:
| Dash Size | Nominal Tube Size (in) | Threads per Inch | Male Thread OD (in) |
|---|---|---|---|
| 2 | 1/8 | 24 | 0.625 |
| 4 | 1/4 | 20 | 0.812 |
| 6 | 3/8 | 18 | 1.000 |
| 8 | 1/2 | 14 | 1.313 |
| 10 | 5/8 | 14 | 1.625 |
| 12 | 3/4 | 14 | 1.938 |
Important Note: While some SAE 45° Flare fittings share the same thread dimensions as JIC 37° Flare (sizes 7/16-20, 1/2-20, 3/4-16 & 7/8-14), they are not interchangeable due to the different flare angles (45° vs 37°). Make sure to use the correct fitting type for your application.
For a more comprehensive list of SAE 45° Flare thread sizes and specifications, you can refer to resources like the SAE J512 standard or online thread charts provided by fitting manufacturers.
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