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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Tight-Seal Brass Compression Tube Fittings for Air and Water
- Temperature Range: -65° to 250° F
- Tubing: Use with firm (Durometer 95A) EVA plastic or polyurethane rubber
- Specifications Met: SAE J512
A built-in tube support slips inside the tubing to prevent collapsing and provides a sturdy connection for an extra-tight seal. Fittings have a single sleeve (ferrule) that compresses the tubing as you tighten the nut. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Fittings with 45° female flared tube end have an internal flare that mates with a male 45° flared fitting.
| For Tube OD (A) | For Tube OD (B) | Material | Max. Pressure | Each | |
UN/UNF (SAE 45°) Threads  | |||||
|---|---|---|---|---|---|
| 3/8" | 1/4" | Brass | 90 psi @ 72° F | 00000000 | 00000 |
Yor-Lok Fittings for Copper Tubing
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Water
- Temperature Range: -40° to 400° F
- Tubing: Use with seamless copper
- Specifications Met: ASME B31.3
A nut with two sleeves (ferrules) gives these fittings extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. Fittings are brass for good corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.
For technical drawings and 3-D models, click on a part number.
Save time installing sleeves—these sets come oriented in the correct direction and order on a dispenser. To install them, slide off a set and place it on your tubing. Each set includes a front and back sleeve. The sleeves are also known as ferrules.
Front Sleeve | Back Sleeve | |||||||
|---|---|---|---|---|---|---|---|---|
| For Tube OD | Sleeve Material | Lg. | No. Included | Lg. | No. Included | Max. Pressure | Each | |
| 1/8" | Brass | 3/16" | 10 | 7/64" | 10 | 2,800 psi @ 72° F | 00000000 | 000000 |
| 1/4" | Brass | 3/16" | 10 | 7/64" | 10 | 1,300 psi @ 72° F | 00000000 | 00000 |
| 3/8" | Brass | 3/16" | 10 | 7/64" | 10 | 1,100 psi @ 72° F | 00000000 | 00000 |
| 1/2" | Brass | 3/16" | 10 | 7/64" | 10 | 1,200 psi @ 72° F | 00000000 | 00000 |
Save time installing sleeves and nuts—these sets come oriented in the correct direction and order on a dispenser. To install them, slide off a set and place it on your tubing. Each set includes a front sleeve, a back sleeve, and a nut. The sleeves are also known as ferrules.
Front Sleeve | Back Sleeve | Nut | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Material | Lg. | No. Included | Lg. | No. Included | Lg. | No. Included | Max. Pressure | Each | |
| 1/8" | Brass | 3/16" | 5 | 7/64" | 5 | 15/32" | 5 | 2,800 psi @ 72° F | 0000000 | 000000 |
| 1/4" | Brass | 3/16" | 5 | 7/64" | 5 | 1/2" | 5 | 1,300 psi @ 72° F | 0000000 | 00000 |
| 3/8" | Brass | 3/16" | 5 | 7/64" | 5 | 9/16" | 5 | 1,100 psi @ 72° F | 0000000 | 00000 |
| 1/2" | Brass | 3/16" | 5 | 7/64" | 5 | 11/16" | 5 | 1,200 psi @ 72° F | 0000000 | 00000 |
For Tube | Tube Support | |||||
|---|---|---|---|---|---|---|
| OD | ID | Style | Material | Max. Pressure | Each | |
| 1/4" | 1/8" | Smooth | Brass | 1,300 psi @ 72° F | 0000000 | 00000 |
| 1/4" | 0.17" | Smooth | Brass | 1,300 psi @ 72° F | 0000000 | 0000 |
| 5/16" | 1/8" | Barbed | Brass | 1,300 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 3/16" | Barbed | Brass | 1,100 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 1/4" | Barbed | Brass | 1,100 psi @ 72° F | 0000000 | 0000 |
| 1/2" | 1/4" | Barbed | Brass | 1,200 psi @ 72° F | 0000000 | 0000 |
| 1/2" | 3/8" | Smooth | Brass | 800 psi @ 72° F | 0000000 | 0000 |
| 5/8" | 3/8" | Barbed | Brass | 1,250 psi @ 72° F | 0000000 | 0000 |