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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About Plastic and Rubber Tubing
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Hard Plastic Tubing for Air and Water
This general purpose tubing has hard walls, yet is flexible enough for gradual bends. It has excellent strength and durability.
Nylon tubing can handle lower temperatures than polypropylene tubing and can withstand higher pressures. It has slightly softer walls than polypropylene tubing, making it more flexible and impact absorbent.
Opaque tubing doesn’t allow you to see what’s flowing through the line. Semi-clear tubing gives you a limited view inside the line.
- Semi-Flexible
- Compatible with Compression and Push to Connect Tube Fittings
- Hard (Rockwell R78)
- Temperature Range: -60° to 200° F
- Semi-Flexible
- Compatible with Compression and Push to Connect Tube Fittings
- Hard (Rockwell R78)
- Temperature Range: -60° to 200° F
Abrasion-Resistant Hard Rubber Tubing for Air and Water
- Semi-Flexible
- Compatible with Push to Connect Tube Fittings
- Hard (Durometer 50D)
- Temperature Range: -30° to 140° F
With excellent resistance to abrasion and tearing, this polyurethane tubing can hold up in rugged environments. The material is ether based, so it stays strong and durable even when exposed to water. Semi-flexible, it’s good for gradual bends.
Opaque tubing blocks your view, so you can’t see inside your line.
Hard Plastic Tubing for Vehicle Air Systems
- Semi-Flexible
- Compatible with Compression and Push to Connect Tube Fittings
- Hard (Durometer 65D)
- Temperature Range: -40° to 200° F
Safely power seat controls, horns, and other vehicle parts with compressed air. This tubing meets SAE or D.O.T. testing and performance standards for use in air-powered vehicle systems. It’s opaque, so you can’t see what’s flowing through the line. Semi-flexible, it’s good for gradual bends.
Static-Control Firm Rubber Tubing for Air and Water
- Flexible
- Compatible with Barbed Tube Fittings
- Firm (Durometer 90A)
- Temperature Range: -40° to 160° F
Static electricity won’t build up in this tubing, so you can use it near sensitive equipment. Tubing is polyurethane, which has excellent abrasion and tear resistance. It is ether based, so it stays strong and durable, even in humid environments. Tubing is opaque, so you cannot see what’s flowing through the line. It is flexible, so it bends easily around objects.
Brass Low-Pressure Barbed Tube Fittings for Air and Water
Made of brass, these fittings resist corrosion from water and are more durable than plastic and aluminum fittings. Use them for low-pressure HVAC systems, drain lines, and other fluid transfer applications, as well as air lines where water vapor and condensate form. The barbs tightly grip tubing for a secure hold. For the best grip, make sure your tubing is squarely cut.
UN/UNF (SAE Straight) male threads with gasket provide extra protection against leaks. Also known as O-ring boss threads.
(SAE Straight) Male
Threads with Gasket
- Temperature Range: NPT, UN/UNF (SAE Straight) Threads: -40° to 500° F
NPTF Threads: -65° to 75° F - Tubing: NPT, UN/UNF (SAE Straight) Threads: Use with firm (Durometer 85A) polyurethane rubber
NPTF Threads: Use with firm (Durometer 95A) polyurethane rubber
| For Tube ID | Thread Size | Number of Barbs | Material | Gasket Material | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||||||
|---|---|---|---|---|---|---|---|
| 5/64" | 10-32 | Single | Brass | Buna-N Rubber | 125 psi @ 72° F | 00000000 | 00000 |
(SAE Straight) Male
Threads with Gasket
- Temperature Range: -40° to 500° F
- Tubing: Use with firm (Durometer 85A) polyurethane rubber
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube ID | Thread Size | Number of Barbs | Material | Gasket Material | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||||||
|---|---|---|---|---|---|---|---|
| 5/64" | 10-32 | Single | Brass | Buna-N Rubber | 125 psi @ 72° F | 00000000 | 000000 |
(SAE Straight) Male
Threads with Gasket
- Temperature Range: -40° to 500° F
- Tubing: Use with firm (Durometer 85A) polyurethane rubber
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube ID | Thread Size | Number of Barbs | Material | Gasket Material | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||||||
|---|---|---|---|---|---|---|---|
| 5/64" | 10-32 | Single | Brass | Buna-N Rubber | 125 psi @ 72° F | 00000000 | 000000 |
- Temperature Range: See table
- Tubing: See table
For Tube | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Tube ID | Number of Barbs | Material | Max. Pressure | Temp. Range, °F | Lg. | Material | Hardness Rating | Hardness | Each | |
| 5/64" | Single | Brass | 125 psi @ 72° F | -40° to 500° | 13/32" | Polyurethane Rubber | Firm | Durometer 85A | 00000000 | 00000 |
| ID | OD | Gasket Material | Max. Pressure | Gasket Color | Pkg. Qty. | Pkg. | |
| 5/32" | 15/64" | Buna-N Rubber | 150 psi @ 72° F | Black | 25 | 0000000 | 00000 |
Nickel-Plated Brass Low-Pressure Barbed Tube Fittings for Air and Water
The nickel plating on these brass fittings provides extra protection against corrosive environments. The plating won’t peel or chip, so the fittings keep a bright, polished appearance. The barbs grip onto tubing, providing a secure hold with no clamp required.
UN/UNF (SAE Straight) and BSPP male threads have an O-ring to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
(SAE Straight) and BSPP
Male Threads with Gasket
- Temperature Range: -40° to 230° F,
except UN/UNF (SAE Straight) Threads: -20° to 160° F - Tubing: Use with hard (Durometer 60D-90D) Buna-N rubber, EVA plastic, Nylon plastic, polyethylene plastic, polypropylene plastic, polyurethane rubber, PTFE plastic, PVC plastic, PVDF plastic, or silicone rubber,
except UN/UNF (SAE Straight) Threads: Use with firm (Durometer 85A) polyurethane rubber
| For Tube ID | Thread Size | Material | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||||
|---|---|---|---|---|---|
| 5/64" | 10-32 | Nickel-Plated Brass | 120 psi @ 72° F | 0000000 | 00000 |
- Temperature Range: -20° to 160° F
- Tubing: Use with firm (Durometer 85A) polyurethane rubber
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube ID | Thread Size | Material | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||||
|---|---|---|---|---|---|
| 5/64" | 10-32 | Nickel-Plated Brass | 120 psi @ 72° F | 0000000 | 00000 |
- Temperature Range: -20° to 160° F
- Tubing: Use with firm (Durometer 85A) polyurethane rubber
| For Tube ID | Material | Max. Pressure | Each | |
| 5/64" | Nickel-Plated Brass | 120 psi @ 72° F | 0000000 | 00000 |
Stainless Steel High-Pressure Barbed Tube Fittings for Air and Water
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-95A) EVA plastic, polyethylene plastic, polypropylene plastic or PVC plastic
Fittings withstand pressures up to 250 psi. They are 303 stainless steel for very good corrosion resistance.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
UN/UNF (SAE Straight)
Male Threads with Gasket
| For Tube ID | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Temp. Range, °F | Number of Barbs | Each | |
NPT Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 5/64" | 1/4 | __ | 303 Stainless Steel | __ | 250 psi @ 72° F | -40° to 1200° F | Single | 0000000 | 000000 |
UN/UNF (SAE Straight) Threads | |||||||||
| 5/64" | __ | 10-32 | 303 Stainless Steel | Viton® Fluoroelastomer Rubber | 250 psi @ 72° F | -40° to 1200° F | Single | 0000000 | 0000 |
