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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Screw-On Nut Barbed Tube Fittings for Air
(SAE Straight) Male
Threads with Gasket
- Temperature Range: 20° to 140° F
- Tubing: Fittings with Anodized Aluminum, Brass, or Nylon Plastic Material: Use with firm or hard (Durometer 95A-60D) polyethylene plastic or polyurethane rubber
Fittings with 316 Stainless Steel Material: Use with firm or hard (Durometer 80A-95A) nylon plastic, polyethylene plastic or polyurethane rubber
You don’t need a clamp to secure these fittings to tubing. They have a nut on the barbed end that tightens to hold the tubing in place.
Brass fittings have good corrosion resistance. Aluminum and nylon fittings have better corrosion resistance than brass and are lighter in weight. 316 stainless steel fittings have excellent corrosion resistance, so they’ll hold up to water, salt, and chemicals.
Metric and BSPP male threads with gasket provide extra protection against leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
Thread | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Tube ID | Pipe Size  | Size | Pitch, mm | Material | Gasket Material | Max. Pressure | Each | |
Metric Threads | ||||||||
| 3mm | __ | M5 | 0.8 | Brass | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 4mm | __ | M5 | 0.8 | Brass | __ | 145 psi @ 72° F | 00000000 | 0000 |
| 6mm | __ | M10 | 1 | Anodized Aluminum | __ | 145 psi @ 72° F | 00000000 | 0000 |
BSPP Threads | ||||||||
| 4mm | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 00000000 | 0000 |
| 6mm | 1/8 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 00000000 | 0000 |
| 6mm | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 0000000 | 0000 |
| 8mm | 1/8 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 00000000 | 0000 |
| 8mm | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 00000000 | 0000 |
NPT Threads | ||||||||
| 1/8" | 1/8 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/8 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 1/4 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 11/32" | 1/4 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 11/32" | 3/8 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 11/32" | 1/2 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 7/16" | 1/4 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 7/16" | 3/8 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 7/16" | 1/2 | __ | __ | 316 Stainless Steel | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 4mm | 1/8 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 0000 |
| 4mm | 1/4 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 0000 |
| 4mm | 3/8 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 6mm | 1/8 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 0000 |
| 6mm | 1/4 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 0000 |
| 6mm | 3/8 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 8mm | 1/4 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 00000 |
| 8mm | 3/8 | __ | __ | Brass | __ | 145 psi @ 72° F | 00000000 | 00000 |
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.
(SAE Straight) Male
Threads with Gasket
Fittings that swivel until tightened rotate 360° for easy installation. They have an external hex drive for easy adjustments in tight spaces. They are also known as banjo-style fittings.
Thread | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube ID, mm | Pipe Size | Size | Pitch, mm | Material | Gasket Material | Max. Pressure | Drive Size, mm | Each | |
Metric Threads | |||||||||
| 3 | __ | M5 | 0.8 | Brass | PVC Plastic | 145 psi @ 72° F | 8 | 0000000 | 000000 |
| 4 | __ | M5 | 0.8 | Brass | PVC Plastic | 145 psi @ 72° F | 8 | 00000000 | 0000 |
BSPP Threads | |||||||||
| 4 | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 17 | 00000000 | 00000 |
| 6 | 1/8 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 14 | 0000000 | 0000 |
| 6 | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 17 | 0000000 | 00000 |
| 8 | 1/4 | __ | __ | Anodized Aluminum | Santoprene Rubber | 145 psi @ 72° F | 17 | 00000000 | 00000 |