How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings
Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With:
NPT × BSPP: Natural Gas, Water
NPT × BSPT and UN/UNF (SAE Straight) Male × NPT Male: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water - Specifications Met:
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
UN/UNF (SAE Straight) Male × NPT Male: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479, SAE J1926
Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | Max. Steam Pressure | Each | |
UN/UNF (SAE Straight) Male × NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 3/4"-16 | 08 | 1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |
| 1 1/16"-12 | 12 | 3/4 | 12 | 3,600 psi @ 72° F | 3,600 psi @ 300° F | 000000000 | 00000 |
| 1 5/16"-12 | 18 | 1 | 18 | 2,900 psi @ 72° F | 2,900 psi @ 300° F | 000000000 | 00000 |
Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Male Threads with
Gasket and Washer
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Male × BSPP Male | ||||||||
| 7/16"-20 | 04 | 1/4 | 04 | 5,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 000000 |
| 7/16"-20 | 04 | 3/8 | 06 | 5,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 9/16"-18 | 06 | 1/4 | 04 | 5,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 9/16"-18 | 06 | 3/8 | 06 | 5,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 3/4"-16 | 08 | 1/2 | 08 | 4,500 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 3/4"-16 | 08 | 3/4 | 12 | 3,600 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 1179, ISO 8434-6, SAE J1926 | 00000000 | 000000 |
Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Male Threads with
Gasket and Washer
- For Use With: See table
- Specifications Met: See table
| Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | Material | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × BSPP Male | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 7/16"-20 | 04 | 1/8 | 02 | 5,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 000000 |
| 7/16"-20 | 04 | 1/4 | 04 | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 9/16"-18 | 06 | 1/4 | 04 | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 9/16"-18 | 06 | 3/8 | 06 | 5,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 3/4"-16 | 08 | 1/2 | 08 | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 7/8"-14 | 10 | 1/2 | 08 | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 1 1/16"-12 | 12 | 3/4 | 12 | 3,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
(SAE Straight) Male
Threads with Gasket and Washer
- For Use With: See table
- Specifications Met: See table
| Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | Material | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Male × BSPP Male | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 7/16"-20 | 04 | 1/4 | 04 | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 7/16"-20 | 04 | 3/8 | 06 | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 0000 |
| 9/16"-18 | 06 | 1/4 | 04 | 5,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 0000 |
| 9/16"-18 | 06 | 3/8 | 06 | 5,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 0000 |
| 9/16"-18 | 06 | 1/2 | 08 | 5,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 3/4"-16 | 08 | 3/8 | 06 | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 0000 |
| 3/4"-16 | 08 | 1/2 | 08 | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 0000 |
| 1 1/16"-12 | 12 | 1/2 | 08 | 3,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
| 1 1/16"-12 | 12 | 3/4 | 12 | 3,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ISO 1179, ISO 11926, ISO 8434-6, SAE J1926 | 00000000 | 00000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. They are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range:
Buna-N Rubber: -20° to 200° F
Fluoroelastomer Rubber: -4° to 400° F - Specifications Met: ASTM B633, SAE J1926
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
Buna-N Rubber Gasket | Fluoroelastomer Rubber Gasket | |||||||
|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | Drive Size | Max. Pressure | Material | Each | Each | ||
UN/UNF (SAE Straight) Male | ||||||||
| 5/16"-24 | 02 | 1/8" | 5,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 7/16"-20 | 04 | 3/16" | 5,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 9/16"-18 | 06 | 1/4" | 4,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 3/4"-16 | 08 | 5/16" | 3,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 7/8"-14 | 10 | 3/8" | 2,700 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 1/16"-12 | 12 | 9/16" | 2,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 5/16"-12 | 16 | 5/8" | 2,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 5/8"-12 | 20 | 3/4" | 1,600 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 7/8"-12 | 24 | 3/4" | 1,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
30° Flared Fittings for Steel Tubing
- Specifications Met: See table
Also known as JIS (Japanese Industrial Standard) fittings, these have a 30° flare on one or both ends. Fittings are zinc-plated steel for fair corrosion resistance.
UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. They are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- Temperature Range: -65° to 500° F, except UN/UNF (SAE Straight) Fittings are -20° to 230° F
| For Tube OD | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Specifications Met | Each | |
UN/UNF (SAE Straight) Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/8" | 1/4 | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 000000 |
| 3/8" | 3/8 | 7/16"-20 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 00000 |
| 1/2" | 3/8 | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 00000 |