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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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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.
NPTF (Dryseal) threads are compatible with NPT threads. 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.
Straight Adapters, Female × Male
Straight Adapter
BSPP, Metric, and
UN/UNF (SAE Straight)
Male Threads with Gasket
UN/UNF (SAE Straight)
Male Threads with Gasket
- Specifications Met: See table
- For Use With: See table
316 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size (A)  | Thread Size (A) | Dash Size (A) | Pipe Size (B) | Thread Size (B) | Dash Size (B) | Max. Pressure | For Use With | Specifications Met | Each | |
NPTF Female × UN/UNF (SAE Straight) Male | ||||||||||
| 1/4 | __ | 04 | __ | 7/16"-20 | 04 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 0000000 |
| 1/4 | __ | 04 | __ | 9/16"-18 | 06 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 1/4 | __ | 04 | __ | 3/4"-16 | 08 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 3/8 | __ | 06 | __ | 9/16"-18 | 06 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 3/8 | __ | 06 | __ | 3/4"-16 | 08 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 1/2 | __ | 08 | __ | 3/4"-16 | 08 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 000000 |
BSPP Female × UN/UNF (SAE Straight) Male | ||||||||||
| 1/4 | __ | 04 | __ | 7/16"-20 | 04 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 1/4 | __ | 04 | __ | 9/16"-18 | 06 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| 1/4 | __ | 04 | __ | 3/4"-16 | 08 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
UN/UNF (SAE Straight) Female × BSPT Male | ||||||||||
| __ | 7/16"-20 | 04 | 1/8 | __ | 02 | 6,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 1/2"-20 | 05 | 1/8 | __ | 02 | 6,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 3/4"-16 | 08 | 3/8 | __ | 06 | 5,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 7/8"-14 | 10 | 1/2 | __ | 08 | 4,500 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 1 1/16"-12 | 12 | 3/4 | __ | 12 | 4,500 psi @ 72° F | Hydraulic Fluid, Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 000000 |
UN/UNF (SAE Straight) Female × BSPP Male | ||||||||||
| __ | 7/16"-20 | 04 | 1/4 | __ | 04 | 5,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 7/16"-20 | 04 | 3/8 | __ | 06 | 5,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 1/2"-20 | 05 | 3/8 | __ | 06 | 5,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 3/4"-16 | 08 | 3/8 | __ | 06 | 5,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
| __ | 1 1/16"-12 | 12 | 3/4 | __ | 12 | 3,500 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
UN/UNF (SAE Straight) Female × Metric Male | ||||||||||
| __ | 1 5/8"-12 | 20 | __ | M42 × 2 mm | __ | 2,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 00000 |
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.
For technical drawings and 3-D models, click on a part number.
Straight Adapters, Female × Male
BSPP and Metric
Male Threads with
Gasket and Washer
Male Threads with
Gasket and Washer
- For Use With: See table
- Specifications Met: See table
| Pipe Size (A) | Dash Size (A) | Thread Size (B) | Max. Pressure | Material | For Use With | Specifications Met | Each | |
NPT Female × Metric Male | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 04 | M12 × 1.5 mm | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
| 1/4 | 04 | M14 × 1.5 mm | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 0000 |
| 3/8 | 06 | M16 × 1.5 mm | 4,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
| 3/8 | 06 | M18 × 1.5 mm | 4,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 0000 |
| 1/2 | 08 | M18 × 1.5 mm | 3,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 0000 |
| 1/2 | 08 | M22 × 1.5 mm | 3,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
Straight Adapters, Male
BSPP, Metric, and UN/UNF
(SAE Straight) Male Threads
with Gasket and Washer
(SAE Straight) Male Threads
with Gasket and Washer
- For Use With: See table
- Specifications Met: See table
| Pipe Size (A) | Dash Size (A) | Thread Size (B) | Max. Pressure | Material | For Use With | Specifications Met | Each | |
NPT Male × Metric Male | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | 02 | M12 × 1.5 mm | 5,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 000000 |
| 1/4 | 04 | M10 × 1 mm | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
| 1/4 | 04 | M14 × 1.5 mm | 6,000 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
| 3/8 | 06 | M18 × 1.5 mm | 5,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
| 1/2 | 08 | M22 × 1.5 mm | 4,500 psi @ 72° F | Galvanized Steel | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 2353, ISO 8434-1 | 00000000 | 00000 |
Replacement Washers
