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 Grease Fitting Threads
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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.
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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
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.
Metal Barbed Hose Fittings for Air and Water
Slide the barbed end into rubber hose and secure with the appropriate clamp or crimp-on hose ferrule.
Brass fittings are softer than other metal fittings, so they’re easier to thread together. Plain brass fittings have good corrosion resistance.Aluminum fittings are lighter in weight than other metal fittings. They have good corrosion resistance.
Stainless steel fittings have very good corrosion resistance. 303 stainless steel fittings won’t rust when exposed to water, making them good for areas that require frequent cleanings. Fittings with a threaded end are also known as hose nipples.
Metric, UN/UNF (SAE Straight), and BSPP male threads with gasket protect against leaks.
For technical drawings and 3-D models, click on a part number.
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UN/UNF (SAE Straight)
Male Threads with Gasket
- Maximum Pressure: See table
- Maximum Vacuum: 27 in. of Hg @ 72° F
- Temperature Range: See table
- Attachment Type: See table
- Specifications Met: See table
For Hose ID | Thread Size | Gasket Material | Max. Pressure | Temperature Range, °F | Attachment Type | Specifications Met | Pkg. Qty. | Pkg. | |
Brass | |||||||||
---|---|---|---|---|---|---|---|---|---|
1/4" | M6 × 1 mm | Fiber | 250 psi @ 72° F | -40° to 160° | Worm-Drive Clamp, Crimp-On Hose Ferrule | SAE J476 | 1 | 0000000 | 00000 |
6mm | M6 × 1 mm | Fiber | 250 psi @ 72° F | -40° to 160° | Worm-Drive Clamp, Crimp-On Hose Ferrule | SAE J476 | 1 | 0000000 | 00000 |
Aluminum | |||||||||
1/4" | M6 × 1 mm | Buna-N Rubber | 125 psi @ 72° F | -30° to 200° | Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule | __ | 1 | 00000000 | 0000 |
6mm | M6 × 1 mm | Buna-N Rubber | 125 psi @ 72° F | -30° to 200° | Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule | __ | 1 | 00000000 | 0000 |
303 Stainless Steel | |||||||||
1/4" | M6 × 1 mm | Buna-N Rubber | 125 psi @ 72° F | -30° to 200° | Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule | __ | 1 | 00000000 | 00000 |
6mm | M6 × 1 mm | Buna-N Rubber | 125 psi @ 72° F | -30° to 200° | Worm-Drive Clamp, Band-and-Buckle Clamp, Crimp-On Hose Ferrule | __ | 1 | 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.
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(SAE Straight) Male
Threads with Gasket
For Tube ID | Thread Size | Thread Pitch, mm | Material | Gasket Material | O-Ring Material | Max. Pressure | Each | |
Metric Threads | ||||||||
---|---|---|---|---|---|---|---|---|
1/16" | M6 | 1 | Aluminum | Fiber | __ | 125 psi @ 72° F | 00000000 | 00000 |
1/8" | M6 | 1 | Aluminum | Fiber | __ | 125 psi @ 72° F | 00000000 | 0000 |
1/4" | M6 | 1 | Aluminum | Fiber | __ | 125 psi @ 72° F | 00000000 | 0000 |
2mm | M6 | 0.75 | Aluminum | __ | Buna-N Rubber | 125 psi @ 72° F | 0000000 | 00000 |
4mm | M6 | 0.75 | Aluminum | __ | Buna-N Rubber | 125 psi @ 72° F | 0000000 | 00000 |
6mm | M6 | 0.75 | Aluminum | __ | Buna-N Rubber | 125 psi @ 72° F | 0000000 | 00000 |
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.
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(SAE Straight) Male
Threads with Gasket
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.
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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 | M6 | 0.75 | 303 Stainless Steel | Viton® Fluoroelastomer Rubber | 250 psi @ 72° F | -40° to 500° F | Single | 00000000 | 000000 |
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.
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- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
Tight-Seal Moisture-Resistant Plastic Barbed Tube Fittings for Air and Water
- Temperature Range: -20° to 280° F
- Tubing: Use with firm or soft (Durometer 50A-90A) polyurethane rubber or PVC plastic
- Specifications Met: FDA Compliant 21 CFR 177.2470
Fittings have a single barb that creates a smooth clamping surface for extra-tight connections that minimize leaks. Made of acetal, they won’t absorb water and lose strength, even in high-humidity environments.
For technical drawings and 3-D models, click on a part number.
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For Tube ID | Thread Size | Thread Pitch | Material | Color | Clarity | Max. Pressure | Pkg. Qty. | Pkg. | |
Metric Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
3mm | M6 | 1 mm | Acetal Plastic | White | Semi-Clear | Not Rated | 10 | 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.
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For Tube ID | O-Ring Material | Thread Size | Material | Max. Pressure | Specifications Met | Each | |
Metric Threads | |||||||
---|---|---|---|---|---|---|---|
4mm | Buna-N Rubber | M6 | 303 Stainless Steel | 270 psi @ 72° F | ASTM A581, ASTM A582, FDA Compliant 21 CFR 177.2600 | 00000000 | 00000 |
6mm | Buna-N Rubber | M6 | 303 Stainless Steel | 270 psi @ 72° F | ASTM A581, ASTM A582, FDA Compliant 21 CFR 177.2600 | 00000000 | 0000 |
Super-Flow Plastic Barbed Tube Fittings for Food and Beverage
- Temperature Range: -25° to 130° F
- Tubing: Use with soft or firm (Durometer 50A-90A) polyurethane rubber or PVC plastic
- Specifications Met: FDA Compliant 21 CFR 177.1520
A smooth interior reduces friction and prevents product buildup, ensuring an unrestricted flow. Fittings have a single barb that creates a smooth clamping surface for extra-tight connections that minimize leaks. Fittings are polyethylene plastic for excellent strength.
For technical drawings and 3-D models, click on a part number.
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For Tube ID | Thread Size | Thread Pitch, mm | Material | Color | Max. Pressure | Pkg. Qty. | Pkg. | |
Metric Threads | ||||||||
---|---|---|---|---|---|---|---|---|
3/32" | M6 | 1 | Polyethylene Plastic | White | Not Rated | 10 | 00000000 | 000000 |
Barbed Fittings for Plastic and Rubber Tubing—Chemicals
- For Use With: Alcohol, Coolant, Mild Bases
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber, PVC plastic, or Viton® fluoroelastomer rubber
Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections. Fittings are polypropylene, which has very good chemical resistance as well as impact and abrasion resistance.
For technical drawings and 3-D models, click on a part number.
Grease Fittings
Thread these fittings into motors, bearings, engine blocks, and other machinery to create a lubrication point. They’re also known as hydraulic grease fittings.
Zinc-plated steel fittings have mild corrosion resistance. Brass fittings resist corrosion better than zinc-plated steel fittings. 303 stainless steel fittings are more corrosion resistant than brass fittings and have good chemical resistance. 316 stainless steel fittings resist corrosion and chemicals better than 303 stainless steel fittings and can be used in saltwater environments.
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.
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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 | |
M6 × 0.75 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 15mm | 5.5mm | 5.5mm | 7mm | 10,000 | Ball | DIN 71412 | 10 | 0000000 | 00000 | 00000 |
Zinc-Plated Steel | 24mm | 6mm | 14mm | 7mm | 10,000 | Ball | DIN 71412 | 5 | 00000000 | 00000 | 00000 |
Brass | 15mm | 5.5mm | 5.5mm | 7mm | 1,450 | Ball | DIN 71412 | 5 | 00000000 | 0000 | 0000 |
303 Stainless Steel | 15mm | 5.5mm | 5.5mm | 7mm | 10,000 | Ball | DIN 71412 | 1 | 0000000 | 0000 | 0000 |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 14mm | 5.4mm | 5.4mm | 7mm | 8,000 | Ball | DIN 71412 | 10 | 0000000 | 0000 | 0000 |
Zinc-Plated Steel | 17.3mm | 5.6mm | 8.5mm | 7mm | 1,450 | Ball | DIN 71412 | 10 | 00000000 | 0000 | 0000 |
Zinc-Plated Steel | 24mm | 6mm | 14mm | 7mm | 10,000 | Ball | DIN 71412 | 10 | 0000000 | 00000 | 00000 |
Zinc-Plated Steel | 29mm | 8.3mm | 19mm | 7mm | 10,000 | Ball | DIN 71412 | 5 | 0000000 | 00000 | 0000 |
Zinc-Plated Steel | 41mm | 6mm | 31mm | 7mm | 10,000 | Ball | DIN 71412 | 1 | 0000000 | 0000 | 0000 |
Brass | 14mm | 4mm | 4mm | 7mm | 10,000 | Ball | DIN 71412 | 5 | 0000000 | 0000 | 0000 |
303 Stainless Steel | 13mm | 5.2mm | 5.2mm | 7mm | 8,000 | Ball | __ | 3 | 0000000 | 0000 | 0000 |
316 Stainless Steel | 15mm | 5.5mm | 5.5mm | 7mm | 1,450 | Ball | DIN 71412 | 1 | 0000000 | 0000 | 0000 |
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Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 0.75 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 18mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | DIN 71412 | 10 | 0000000 | 000000 | 000000 |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 18mm | 5.5mm | 5.5mm | 9mm | 8,000 | Ball | DIN 71412 | 10 | 0000000 | 00000 | 00000 |
Brass | 18mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | DIN 71412 | 5 | 0000000 | 00000 | 00000 |
303 Stainless Steel | 18mm | 5.6mm | 5.6mm | 9mm | 8,000 | Ball | __ | 3 | 0000000 | 00000 | 00000 |
316 Stainless Steel | 18mm | 5.5mm | 5.5mm | 9mm | 1,450 | Ball | DIN 71412 | 1 | 0000000 | 00000 | 00000 |
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Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 20.5mm | 5.5mm | 5.5mm | 9mm | 1,450 | Ball | DIN 71412 | 10 | 00000000 | 000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/129/1293k33p2-g02a-digital@halfx_637032263834305130.png?ver=imagenotfound)
Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 0.75 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 24mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | DIN 71412 | 10 | 0000000 | 000000 | 000000 |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 23mm | 5.5mm | 5.5mm | 9mm | 8,000 | Ball | DIN 71412 | 10 | 0000000 | 00000 | 00000 |
Brass | 24mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | DIN 71412 | 5 | 0000000 | 00000 | 00000 |
303 Stainless Steel | 23mm | 5.6mm | 5.6mm | 9mm | 8,000 | Ball | __ | 3 | 0000000 | 00000 | 00000 |
316 Stainless Steel | 23.5mm | 5.5mm | 5.5mm | 9mm | 1,450 | Ball | DIN 71412 | 1 | 0000000 | 00000 | 00000 |
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Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Square Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 18mm | 5.5mm | 5.5mm | 9mm | 1,450 | Ball | DIN 71412 | 5 | 00000000 | 000000 | 00000 |
Button-Head Grease Fittings
Often used on earth movers, mining equipment, and other heavy machinery, these fittings have a T-shaped top that holds the dispensing tip in place so it won’t pop off when adding grease. They're best for machinery requiring high volumes of grease because they let more grease pass through than standard grease fittings, thanks to a larger opening. An integral check valve prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.
Zinc-plated steel fittings have mild corrosion resistance. 303 stainless steel fittings are more corrosion resistant than zinc-plated steel fittings and have good chemical resistance.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/109/1094k49p1-g02a-digital@halfx_637032261223848040.png?ver=imagenotfound)
Each | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Head Dia. | Max. Pressure, psi | Check Valve Type | Specifications Met | 1-9 | 10-Up | |
M6 × 1 mm Metric Threads | |||||||||||
Zinc-Plated Steel | 14mm | 6mm | 6mm | 11mm | 10mm | 1,450 | Ball | DIN 3404 | 0000000 | 00000 | 00000 |
Zinc-Plated Steel | 17mm | 6mm | 6mm | 17mm | 16mm | 10,000 | Ball | DIN 3404 | 0000000 | 0000 | 0000 |
303 Stainless Steel | 17mm | 6mm | 6mm | 17mm | 16mm | 10,000 | Ball | DIN 3404 | 0000000 | 00000 | 00000 |
Flush-Style Grease Fittings
![](/prerenderstable/mvPRE/contents/gfx/imagecache/242/2421k31p1-g02a-digital@halfx_637032966448361233.png?ver=imagenotfound)
The nipple doesn't stick out, so these fittings fit in tight spaces and won't be damaged if something knocks into them. An integral check valve prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.
Zinc-plated steel fittings have mild corrosion resistance. 303 stainless steel fittings are more corrosion resistant than zinc-plated steel fittings and have good chemical resistance.
Install Style C with a hex wrench.
For technical drawings and 3-D models, click on a part number.
Pkg. | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Style | Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
Straight with Male Threads | ||||||||||||
M6 × 0.75 mm Metric Threads | ||||||||||||
C | Zinc-Plated Steel | 9mm | 6mm | 6mm | 7mm | 1,450 | Ball | DIN 3405 | 5 | 00000000 | 00000 | 00000 |
M6 × 1 mm Metric Threads | ||||||||||||
C | Zinc-Plated Steel | 9mm | 6mm | 6mm | 7mm | 10,000 | Ball | DIN 3405 | 5 | 0000000 | 0000 | 0000 |
C | 303 Stainless Steel | 9mm | 6mm | 6mm | 7mm | 1,450 | Ball | DIN 3405 | 1 | 00000000 | 0000 | 0000 |
Self-Tapping Grease Fittings for Unthreaded Holes
To fit securely in unthreaded holes, these fittings cut threads as they’re installed. Use a hex wrench to install. Fittings can be driven in, but then are not pressure rated. They're zinc-plated steel for mild corrosion resistance. All have an integral check valve that prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants. These fittings are also known as hydraulic grease fittings.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/110/1103k23p1-g02a-digital@halfx_637032259380066344.png?ver=imagenotfound)
Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Material | Overall Ht. | Shank Lg. | Thread Lg. | Square Size | Max. Pressure, psi | Check Valve Type | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 1 mm Metric Threads | |||||||||||
5.6-5.7mm | Zinc-Plated Steel | 18mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | 10 | 0000000 | 000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/110/1103k22p1-g02a-digital@halfx_637032141259406979.png?ver=imagenotfound)
Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Material | Overall Ht. | Shank Lg. | Thread Lg. | Square Size | Max. Pressure, psi | Check Valve Type | Pkg. Qty. | 1-9 | 10-Up | |
M6 × 1 mm Metric Threads | |||||||||||
5.6-5.7mm | Zinc-Plated Steel | 20mm | 5.5mm | 5.5mm | 9mm | 10,000 | Ball | 10 | 0000000 | 000000 | 000000 |
Self-Tapping Flush-Style Grease Fittings for Unthreaded Holes
![](/prerenderstable/mvPRE/contents/gfx/imagecache/242/2421k38p1-g02a-digital@halfx_637032971199680089.png?ver=imagenotfound)
Ensure a secure fit in unthreaded holes—these fittings cut threads as they’re installed. Use them in tight spaces where protruding fittings won't work. Install with a hex wrench. Fittings can be driven in, but then are not pressure rated. They’re zinc-plated steel for mild corrosion resistance. An integral check valve prevents 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.
Pkg. | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Material | Overall Ht. | Shank Lg. | Thread Lg. | Hex Size | Max. Pressure, psi | Check Valve Type | Specifications Met | Pkg. Qty. | 1-9 | 10-Up | |
Straight with Male Threads | ||||||||||||
M6 × 1 mm Metric Threads | ||||||||||||
5.6-5.7 mm | Zinc-Plated Steel | 8.5 mm | 5.5 mm | 5.5 mm | 7 mm | 10,000 | Ball | DIN 3405 | 5 | 0000000 | 000000 | 000000 |
Grease Fitting Adapters
When the size or thread type of a fitting doesn't match an existing opening, use these adapters to make the connection.
Zinc-plated steel adapters have mild corrosion resistance. UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.
For technical drawings and 3-D models, click on a part number.