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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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Nuts for 45° Flared Fittings for Copper and Brass Tubing
- For Use With: Cutting Oil, Fuel Oil, Refrigerant, Mineral Oil, Diesel Fuel, Water, Air
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper that meets ASTM B280
- Specifications Met: SAE J512, SAE J513, UL Listed
Use these nuts with 45° flared tube fittings to provide a tight metal-to-metal seal on flared copper and brass tubing. Nuts are brass for good corrosion resistance. They don’t require a sleeve, which makes for a fast, convenient installation.
Long nuts support more of the tube’s surface area than short nuts for a strong grip in high-vibration applications.
For technical drawings and 3-D models, click on a part number.
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Lg. | Each | ||
Short Nuts | |||||||
| A | 1/8" | 0.03" | Brass | 2,800 psi @ 72° F | 1/2" | 000000000 | 00000 |
| A | 3/16" | 0.035" | Brass | 1,900 psi @ 72° F | 5/8" | 000000000 | 0000 |
| A | 1/4" | 0.049" | Brass | 1,400 psi @ 72° F | 3/4" | 000000000 | 0000 |
| A | 5/16" | 0.049" | Brass | 1,200 psi @ 72° F | 7/8" | 000000000 | 0000 |
| A | 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | 29/32" | 000000000 | 0000 |
| A | 3/8" | 0.065" | Brass | 1,000 psi @ 72° F | 1" | 000000000 | 0000 |
| A | 1/2" | 0.032" | Brass | 750 psi @ 72° F | 1" | 000000000 | 0000 |
| A | 1/2" | 0.083" | Brass | 750 psi @ 72° F | 1 1/8" | 000000000 | 0000 |
| A | 5/8" | 0.035" | Brass | 650 psi @ 72° F | 1 1/16" | 000000000 | 0000 |
| A | 5/8" | 0.095" | Brass | 650 psi @ 72° F | 1 5/16" | 000000000 | 0000 |
| A | 3/4" | 0.035" | Brass | 550 psi @ 72° F | 1 5/32" | 000000000 | 00000 |
| A | 3/4" | 0.109" | Brass | 550 psi @ 72° F | 1 1/2" | 000000000 | 00000 |
| B | 1/4" | 0.03" | Brass | 1,400 psi @ 72° F | 5/8" | 00000000 | 0000 |
| B | 1/4" | 0.03" | Brass | 1,400 psi @ 72° F | 23/32" | 000000000 | 0000 |
| B | 5/16" | 0.032" | Brass | 1,200 psi @ 72° F | 21/32" | 000000000 | 00000 |
| B | 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | 23/32" | 000000000 | 0000 |
| B | 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | 27/32" | 000000000 | 00000 |
| B | 1/2" | 0.032" | Brass | 750 psi @ 72° F | 27/32" | 000000000 | 0000 |
| B | 1/2" | 0.035" | Brass | 750 psi @ 72° F | 31/32" | 000000000 | 00000 |
| B | 5/8" | 0.035" | Brass | 650 psi @ 72° F | 31/32" | 000000000 | 0000 |
| B | 3/4" | 0.035" | Brass | 550 psi @ 72° F | 1 5/32" | 000000000 | 00000 |
Long Nuts | |||||||
| A | 1/8" | 0.03" | Brass | 2,800 psi @ 72° F | 3/4" | 000000000 | 0000 |
| A | 3/16" | 0.035" | Brass | 1,900 psi @ 72° F | 13/16" | 000000000 | 0000 |
| A | 1/4" | 0.049" | Brass | 1,400 psi @ 72° F | 15/16" | 000000000 | 0000 |
| A | 5/16" | 0.049" | Brass | 1,200 psi @ 72° F | 1 1/8" | 000000000 | 0000 |
| A | 3/8" | 0.065" | Brass | 1,000 psi @ 72° F | 1 5/16" | 000000000 | 0000 |
| A | 1/2" | 0.083" | Brass | 750 psi @ 72° F | 1 5/8" | 000000000 | 0000 |
| A | 5/8" | 0.095" | Brass | 650 psi @ 72° F | 1 7/8" | 000000000 | 00000 |
| A | 3/4" | 0.109" | Brass | 550 psi @ 72° F | 2 3/16" | 000000000 | 00000 |
| B | 1/4" | 0.03" | Brass | 1,400 psi @ 72° F | 15/16" | 000000000 | 0000 |
| B | 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | 1 1/16" | 000000000 | 00000 |
| B | 1/2" | 0.032" | Brass | 750 psi @ 72° F | 1 3/16" | 000000000 | 00000 |
| B | 5/8" | 0.035" | Brass | 650 psi @ 72° F | 1 7/16" | 000000000 | 00000 |
Nuts for Supported 45° Flared Fittings for Copper and Brass Tubing
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper
- Specifications Met: SAE J512, UL Listed
Use these nuts with supported 45° flared fittings to create a tight metal-to-metal seal on flared copper and brass tubing. They are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Nuts for 37° Flared Fittings for Copper Tubing
- For Use With: Air, Fuel Oil, Mineral Oil, Water
- Temperature Range: -40° to 400° F
- Tubing: Use with seamless copper
- Specifications Met: ISO 8434, MIL-F-18866, SAE J514
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on copper tubing that is flared to 37°. They are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Nuts for 37° Flared Fittings for Stainless Steel Tubing
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
- Tubing: Use with seamless or welded 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Specifications Met: ISO 8434, SAE J514
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Nuts are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Each | |
| 1/8" | 316 Stainless Steel | 000000000 | 00000 |
| 3/16" | 316 Stainless Steel | 000000000 | 0000 |
| 1/4" | 316 Stainless Steel | 000000000 | 0000 |
| 5/16" | 316 Stainless Steel | 000000000 | 0000 |
| 3/8" | 316 Stainless Steel | 000000000 | 0000 |
| 1/2" | 316 Stainless Steel | 000000000 | 0000 |
| 5/8" | 316 Stainless Steel | 000000000 | 00000 |
| 3/4" | 316 Stainless Steel | 000000000 | 00000 |
| 1" | 316 Stainless Steel | 000000000 | 00000 |
Nuts for Precision AN 37° Flared Fittings for Stainless Steel Tubing
- For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil, Water
- Temperature Range: -320° to 1200° F
- Tubing: Use with seamless 304 or 316 stainless steel
- Specifications Met: See Table
Use these nuts with precision AN sleeves and fittings to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. The threads are Class 3B and adhere to tighter tolerances than other nuts. They are made to exact AS (formerly AN) specifications.
304 stainless steel nuts have very good corrosion resistance. 316 stainless steel nuts have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
304 Stainless Steel | 316 Stainless Steel | |||||
|---|---|---|---|---|---|---|
| For Tube OD | Max. Pressure | Specifications Met | Each | Each | ||
| 1/8" | 3,000 psi @ 72° F | AN818-2J, ASTM A380, SAE AS4841 | 0000000 | 00000 | 000000 | 00 |
| 1/8" | 3,000 psi @ 72° F | AN818-2K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 00000 |
| 1/4" | 3,000 psi @ 72° F | AN818-4J, ASTM A380, SAE AS4841 | 0000000 | 0000 | 000000 | 00 |
| 1/4" | 3,000 psi @ 72° F | AN818-4K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 0000 |
| 3/8" | 3,000 psi @ 72° F | AN818-6J, ASTM A380, SAE AS4841 | 0000000 | 0000 | 000000 | 00 |
| 3/8" | 3,000 psi @ 72° F | AN818-6K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 0000 |
| 1/2" | 3,000 psi @ 72° F | AN818-8J, ASTM A380, SAE AS4841 | 0000000 | 0000 | 000000 | 00 |
| 1/2" | 3,000 psi @ 72° F | AN818-8K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 0000 |
| 3/4" | 3,000 psi @ 72° F | AN818-12J, ASTM A380, SAE AS4841 | 0000000 | 00000 | 000000 | 00 |
| 3/4" | 3,000 psi @ 72° F | AN818-12K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 00000 |
| 1" | 3,000 psi @ 72° F | AN818-16J, ASTM A380, SAE AS4841 | 00000000 | 00000 | 000000 | 00 |
| 1" | 3,000 psi @ 72° F | AN818-16K, ASTM A380, SAE AS4841 | 000000 | 00 | 00000000 | 00000 |
Nuts for 37° Flared Fittings for Aluminum Tubing
- For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
- Temperature Range: -60° to 350° F
- Tubing: Use with seamless aluminum
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on aluminum tubing that is flared to 37°. Nuts are aluminum, which is lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 3/16" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 00000 |
| 1/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 5/16" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 3/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 1/2" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 5/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 3/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
| 1" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 0000 |
| 1 1/4" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 00000 |
Nuts for 37° Flared Fittings for Steel Tubing
- For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
- Temp. Range: -60° to 400° F
- Tubing: Use with seamless steel
- Specifications Met: SAE J514
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on steel tubing that is flared to 37°. They are zinc-plated steel for fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1/4" | Zinc-Plated Steel | 4,500 psi @ 72° F | 000000000 | 00000 |
| 5/16" | Zinc-Plated Steel | 4,000 psi @ 72° F | 000000000 | 0000 |
| 3/8" | Zinc-Plated Steel | 4,000 psi @ 72° F | 000000000 | 000 |
| 1/2" | Zinc-Plated Steel | 4,000 psi @ 72° F | 000000000 | 0000 |
| 5/8" | Zinc-Plated Steel | 3,000 psi @ 72° F | 000000000 | 0000 |
| 3/4" | Zinc-Plated Steel | 3,000 psi @ 72° F | 000000000 | 0000 |
| 1" | Zinc-Plated Steel | 2,500 psi @ 72° F | 000000000 | 0000 |