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. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks.
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 × 2 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 |
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 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 |
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 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.
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 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/4 | 12 | M27 × 2 mm | 3,000 psi @ 72° F | Zinc Plated Steel | 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 | Washer Material | Thickness | Each | |
For Metric Male | |||||
|---|---|---|---|---|---|
| M27 | Buna-N Rubber | Steel | 2mm | 00000000 | 00000 |
45° Flared Fittings for Copper and Brass Tubing
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper that meets ASTM B280
No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.
Metric and UN/UNF (Straight) threads have a gasket to protect against leaks. Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except adapters for 1/8" and 1" tube OD are not for use with fuel oil
- Specifications Met: See table
For Tube | Each | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Specifications Met | 1-9 | 10-49 | 50-Up | |
Metric Threads | |||||||||||
| 5/8" | 0.035" | M27 | 2 | Brass | Fluoroelastomer Rubber | 650 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 000000 | 000000 | 000000 |
| 3/4" | 0.035" | M27 | 2 | Brass | Fluoroelastomer Rubber | 550 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 00000 | 00000 | 00000 |
- For Use With:
Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water - Specifications Met: SAE J512, SAE J513, UL Listed
For Tube | Each | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | 1-9 | 10-49 | 50-Up | |
Metric Threads | ||||||||||
| 5/8" | 0.035" | M27 | 2 | Brass | Fluoroelastomer Rubber | 650 psi @ 72° F | 000000000 | 000000 | 000000 | 000000 |
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
- Specifications Met: SAE J512, SAE J513, UL Listed
For Tube | Each | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | 1-9 | 10-49 | 50-Up | |
Metric Threads | ||||||||||
| 5/8" | 0.035" | M27 | 2 | Brass | Fluoroelastomer Rubber | 650 psi @ 72° F | 000000000 | 000000 | 000000 | 000000 |
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
- Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only