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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Brass Compression Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: See table
- Tubing: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic or polyurethane rubber
- Specifications Met: SAE J512, except metric sizes
A single sleeve (ferrule) compresses the tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.
| Tube Stem OD, mm | For Hose ID, mm | Material | Max. Pressure | Temp. Range, °F | Each | |
| 4 | 4 | Brass | 2100 psi @ 72° F | -75° to 550° | 00000000 | 00000 |
| 6 | 4 | Brass | 2100 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
| 6 | 7 | Brass | 2100 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
| 8 | 7 | Brass | 1900 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
| 8 | 10 | Brass | 1900 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
| 10 | 10 | Brass | 1300 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
| 12 | 10 | Brass | 1000 psi @ 72° F | -75° to 550° | 00000000 | 0000 |
- For Use With:
Short nuts: Air, Water, Lubricated Air
Long nuts: Air, Water, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil - Temperature Range: See table
- Tubing:
Short nuts: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
Long nuts: Use with firm or hard (Durometer 1A-95A) copper, nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber - Specifications Met: See table
- For Use With:
UL Listed sleeves: Air, Water, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
All other sleeves: Air, Water, Lubricated Air - Temperature Range: See table
- Tubing:
UL Listed sleeves: Use with firm or hard (Durometer 1A-95A) copper, nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
All other sleeves: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber - Specifications Met: See table
Precision Compression Fittings for Stainless Steel Tubing
- For Use With: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
- Temperature Range: -420° to 1200° F
- Tubing: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Compatible With: Parker CPI
Made to tighter tolerances than other compression fittings, these are designed for high-precision applications. Also known as instrumentation fittings and flareless fittings. They come with a nut and a single sleeve (ferrule). The sleeve bites into tubing as you tighten the nut to create a strong seal. Fittings are 316 stainless steel for excellent corrosion resistance. A molybdenum disulfide coating on the nut acts as a lubricant for easy installation.
Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.
| Tube Stem OD | Pipe Size | Material | Max. Pressure | Each | |
| 1/8" | 1/8 | 316 Stainless Steel | 5,500 psi @ 72° F | 00000000 | 000000 |
| 1/8" | 1/4 | 316 Stainless Steel | 5,500 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/8 | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/4 | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 3/8 | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4 | 316 Stainless Steel | 2,600 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 3/8 | 316 Stainless Steel | 2,600 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/2 | 316 Stainless Steel | 2,600 psi @ 72° F | 00000000 | 00000 |
| 1/2" | 3/8 | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 00000 |
| 1/2" | 1/2 | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 00000 |
| 3/4" | 3/4 | 316 Stainless Steel | 2,100 psi @ 72° F | 00000000 | 00000 |