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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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. 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.
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
Thread Size | Dash Size | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Lg. | Max. Pressure | Material | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × UN/UNF (SAE Straight) Male | ||||||||||
| 1 1/16"-12 | 1 7/8"-12 | 12 | 24 | 1" | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 000000 |
| 1 5/16"-12 | 1 7/8"-12 | 16 | 24 | 1" | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
37° Flared Fittings for Stainless Steel Tubing
- Tubing: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Specifications Met: ISO 8434, SAE J514, except fittings with BSPP and BSPT threads meet SAE J514 only
Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They withstand high pressure, so they’re often used in hydraulic applications. Made from 316 stainless steel, they resist corrosion from water and chemicals. A complete fitting requires a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1200°
Fittings with female tube end have an internal flare that mates with the male tube end of another fitting.
| For Tube OD (A) | For Tube OD (B) | Material | Max. Pressure | Each | |
| 1 1/2" | 1" | 316 Stainless Steel | 3,500 psi @ 72° F | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
Use these sleeves with a nut and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.