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About Grease Fitting Threads
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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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Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings
When space is at a premium choose these compact fittings. Though small in size, they have the strength to handle medium-pressure applications. Fittings are stainless steel for very good corrosion resistance.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. Made from fluoroelastomer, these gaskets resist chemicals, including benzene, butyl alcohol, and ethylene glycol. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.


UN/UNF (SAE Straight)
Male Threads with Gasket
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A314, ASTM A320, ASTM A582
303 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Pipe Size | Thread Size | Max. Pressure | Max. Steam Pressure | Gasket Material | Each | |
NPT Male × Metric Male | ||||||
1/16 | M5 × 0.8 mm | 500 psi @ 72° F | 100 psi @ 350° F | Fluoroelastomer Rubber | 00000000 | 000000 |
1/8 | M5 × 0.8 mm | 500 psi @ 72° F | 100 psi @ 350° F | Fluoroelastomer Rubber | 00000000 | 00000 |
1/4 | M5 × 0.8 mm | 500 psi @ 72° F | 100 psi @ 350° F | Fluoroelastomer Rubber | 00000000 | 00000 |
High-Pressure Plated Brass Threaded Pipe Nipples and Pipe
The plating on this pipe creates a shiny finish and provides extra protection in corrosive environments. It has the strength to handle high-pressure applications.
Nickel-plated brass pipe provides better corrosion resistance than unplated brass.
Fully threaded pipe is also known as a close nipple; it is threaded on each end to the center.
For technical drawings and 3-D models, click on a part number.


- For Use With: Air, Natural Gas, Oil, Water
Nickel-Plated Brass | |||||
---|---|---|---|---|---|
Thread Size | Lg. | Hex Wd. | Max. Pressure | Each | |
Metric | |||||
M5 | 7/16" | 5/16" | 1,080 psi @ 72° F | 00000000 | 00000 |
High-Pressure Plated Brass Threaded Pipe Fittings
The plating on these brass fittings creates a shiny finish and provides extra protection in corrosive environments. Fittings have the strength to handle high-pressure applications.
Nickel-plated brass fittings provide better corrosion resistance than unplated brass fittings.
For technical drawings and 3-D models, click on a part number.


- For Use With: Air, Natural Gas, Oil, Water
Nickel-Plated Brass | ||||
---|---|---|---|---|
Pipe Size | Thread Size | Max. Pressure | Each | |
BSPP Male × Metric Male | ||||
1/8 | M5 × 0.8 mm | 1,080 psi @ 72° F | 00000000 | 00000 |
Miniature Medium-Pressure Aluminum Threaded Pipe Fittings
Their small size makes these miniature fittings a good choice for cramped, confined spaces. They are designed to handle medium-pressure applications. Fittings are aluminum, which is lightweight with good corrosion resistance.
Metric and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks.
For technical drawings and 3-D models, click on a part number.


(SAE Straight) Male
Threads with Gasket
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.
Metric male threads have a fiber gasket that forms a tight seal.
For technical drawings and 3-D models, click on a part number.


- 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
Choose-a-Color Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Color-code fittings for easy identification. Fittings are aluminum, which is lightweight with good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric and UN/UNF (SAE Straight) male threads have a gasket for a tight seal.
For technical drawings and 3-D models, click on a part number.


(SAE Straight) Male
Threads with Gasket
For Tube ID | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Choose a Color | Each | |
Metric Threads | ||||||||
---|---|---|---|---|---|---|---|---|
1/16" | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 00000 | |
1/8" | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
1/4" | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
4mm | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 00000 |
Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Made of aluminum, these fittings are lighter in weight than other metal barbed tube fittings and have good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket or O-ring for a tight seal.
For technical drawings and 3-D models, click on a part number.


(SAE Straight) Male
Threads with Gasket
For Tube ID | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Each | |
Metric Threads | |||||||
---|---|---|---|---|---|---|---|
1/8" | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 00000 |
1/4" | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
1mm | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 0000000 | 0000 |
2mm | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 0000000 | 0000 |
4mm | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 0000000 | 0000 |
6mm | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 0000000 | 0000 |
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.
For technical drawings and 3-D models, click on a part number.


UN/UNF (SAE Straight)
Male Threads with Gasket
For Tube ID | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Temp. Range, °F | Number of Barbs | Each | |
Metric Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
6mm | M5 | 0.8 | 303 Stainless Steel | Viton® Fluoroelastomer Rubber | 250 psi @ 72° F | -40° to 500° F | Single | 00000000 | 000000 |
Plastic Barbed Tube Fittings for Air and Water
Fittings have barbs that grip onto tubing.
Nylon fittings have excellent impact and abrasion resistance.
For technical drawings and 3-D models, click on a part number.

- Temperature Range: See table
- Tubing: Semi-Clear: Use with firm or soft (Durometer 45A-80A) polyurethane rubber or PVC plastic
Opaque: Use with firm or soft (Durometer 40A-80A) polyurethane rubber or PVC plastic
For Tube ID | Thread Size | Material | Color | Clarity | Max. Pressure | Temp. Range, °F | Pkg. Qty. | Pkg. | |
Metric Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
3mm | M5 × 0.5 mm | Nylon Plastic | Gray | Opaque | 145 psi @ 72° F | -40° to 190° | 10 | 00000000 | 00000 |
Tight-Seal Plastic Barbed Tube Fittings for Air and Water
Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections. Fittings are nylon for excellent impact and abrasion resistance.
For technical drawings and 3-D models, click on a part number.

- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
Push-to-Connect Tube Fittings for Air


UN/UNF (SAE Straight)
Male Threads with Gasket
- Temperature Range: 0° to 170° F
- Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
- Specifications Met: ISO 14743, except polybutylene plastic fittings
Insert tubing into these fittings and an internal gripping ring and O-ring hold the tubing tight. They are also known as instant fittings. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings have good corrosion resistance.
Identification rings (sold separately) snap over the release ring so you can color-code your lines.
Clips (sold separately) align and organize your tubing and fittings.
Metric male threads have either a gasket or a thread sealant to protect against leaks.
For technical drawings and 3-D models, click on a part number.


UN/UNF (SAE Straight)
Male Threads with Gasket
Fittings with tube stem insert into the push-to-connect end of another fitting in place of a length of tubing.
Tube Stem OD | Thread Size | Thread Pitch, mm | Tube Connection Material | Pipe Connection Material | Gasket Material | Color | Max. Pressure | Each | |
Metric Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
4mm | M5 | 0.8 | Nylon Plastic | Nickel-Plated Brass | Buna-N Rubber | Black | 290 psi @ 72° F | 00000000 | 000000 |
Stainless Steel Barbed Tube Fittings for Food and Beverage
- Temperature Range: -20° to 750° F
- Tubing: Use with soft or firm (Durometer 65A-90A) polyurethane rubber or PVC plastic
- Specifications Met: See table
Made of stainless steel, these fittings are more durable than plastic barbed tube fittings for food and beverage. They have single or multiple barbs that grip onto tubing.
Metric and BSPP fittings have a Buna-N O-ring to ensure a strong seal. Buna-N is made of FDA listed material for use with food and beverages. These O-rings are resilient and resist tearing, animal and vegetable oil, citric acid, sodium bicarbonate, grease, and motor oil.
For technical drawings and 3-D models, click on a part number.


For Tube ID | O-Ring Material | Thread Size | Material | Max. Pressure | Specifications Met | Each | |
Metric Threads | |||||||
---|---|---|---|---|---|---|---|
6mm | Buna-N Rubber | M5 | 303 Stainless Steel | 270 psi @ 72° F | ASTM A581, ASTM A582, FDA Compliant 21 CFR 177.2600 | 00000000 | 00000 |
Grease Fittings
These fittings are also known as hydraulic grease fittings.
Zinc-plated steel fittings have mild corrosion resistance. 303 stainless steel fittings are more corrosion resistant than brass fittings and have good chemical resistance.
Fittings with a check valve prevent grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.
For technical drawings and 3-D models, click on a part number.

Male
Threads

Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
M5 × 0.8 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 24mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | DIN 71412 | 10 | 0000000 | 000000 | 000000 |