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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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About Nuts, Materials, and Finishes
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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. 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.


UN/UNF (SAE Straight)
Male Threads with Gasket
- Specifications Met: See table
- For Use With: See table
316 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
Thread Size (A) | Dash Size (A) | Thread Size (B) | Dash Size (B) | Max. Pressure | For Use With | Each | |
Metric Female × UN/UNF (SAE Straight) Male | |||||||
M27 × 2 mm | __ | 1 1/16"-12 | 12 | 5,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | 000000000 | 000000 |
UN/UNF (SAE Straight) Female × Metric Male | |||||||
1 1/16"-12 | 12 | M27 × 2 mm | __ | 3,500 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | 000000000 | 00000 |


Male Threads with
Gasket and Washer
- For Use With: See table
- Specifications Met: See table
316 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
Pipe Size (A) | Dash Size (A) | Thread Size (B) | Max. Pressure | For Use With | Specifications Met | Each | |
BSPP Male × Metric Male | |||||||
3/4 | 12 | M27 × 1.5 mm | 3,600 psi @ 72° F | Hydraulic Fluid, Oil, Water | DIN 7631, ISO 1179, ISO 8434-6, ISO 9974 | 00000000 | 000000 |

- Temperature Range: -22° to 230° F
316 Stainless Steel | ||||
---|---|---|---|---|
For Pipe Size | Gasket Material | Thickness | Each | |
For BSPP Male | ||||
3/4 | Buna-N Rubber | 2.5mm | 00000000 | 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 steel, which has fair corrosion resistance. 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.


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 | For Use With | Specifications Met | Each | |
NPT Female × Metric Male | |||||||
---|---|---|---|---|---|---|---|
3/4 | 12 | M27 × 2 mm | 3,000 psi @ 72° F | Air, Hydraulic Fluid, Oil, Water | ASME B1.20.3, DIN 7631, ISO 6149, ISO 9974 | 00000000 | 000000 |

- Temperature Range: -20° to 230° F
For Thread Size | Gasket Material | Thickness | Each | |
For Metric Male | ||||
---|---|---|---|---|
M27 | Buna-N Rubber | 2mm | 00000000 | 00000 |
High-Pressure Brass Threaded Pipe Fittings
These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.


- For Use With: Air, Water, Natural Gas, Oil
- Specifications Met: SAE J530, SAE J531
Pipe Size | Thread Size | Max. Pressure | Male End Gasket Material | Each | |
NPTF Female × Metric Male | |||||
---|---|---|---|---|---|
1/2 | M27 × 2 mm | 1,000 psi @ 72° F | Fluorocarbon Rubber | 000000000 | 000000 |
Metric Low-Strength Steel Coupling Nuts

Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Metric High-Strength Steel Coupling Nuts—Class 10

Often referred to as extension nuts, use these to connect and extend threaded rods. Made from Class 10 steel, they're about 25% stronger than medium-strength steel coupling nuts and comparable in strength to Class 10.9 bolts.
Zinc-plated steel nuts are corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | Each | ||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Lg., mm | Wd., mm | Specifications Met | 1-9 | 10-Up | |
Zinc-Plated Steel—Class 10 | |||||||
M27 | 3 | 81 | 41 | DIN 6334 | 000000000 | 000000 | 000000 |
Metric 18-8 Stainless Steel Coupling Nuts

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.
For technical drawings and 3-D models, click on a part number.
Thread | Each | |||||
---|---|---|---|---|---|---|
Size | Pitch, mm | Lg., mm | Wd., mm | 1-9 | 10-Up | |
18-8 Stainless Steel | ||||||
M27 | 3 | 81 | 41 | 000000000 | 000000 | 000000 |