How to Measure Threaded Pipe Size
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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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Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
DIN 3852 fittings meet DIN standards for mating surface outer diameter. They have a Buna-N rubber gasket that resists grease, hydraulic oil, and motor oil—plus mild chemicals and water. The gasket stays in a groove undercut in the mating face, which prevents it from dropping out and from extruding when fittings are tightened. Black anodized and powder-coated fittings have a decorative matte black finish.
The contact surface on fittings with a flange extends beyond the external hex drive.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/447/44705k334-@halfx_637661942362097454.png?ver=imagenotfound)
- For Use With: Air, Oil, Water
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
Pipe Size | Plug Construction | Max. Pressure | Each | |
NPT Male | ||||
---|---|---|---|---|
3/8 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1/2 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
3/4 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1 1/4 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1 1/2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
2 1/2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
3 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
4 | Solid | 150 psi @ 72° F | 000000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/447/44705k384-@halfx_637661948522390903.png?ver=imagenotfound)
- For Use With: Air, Oil, Water
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
Pipe Size | Plug Construction | Max. Pressure | Each | |
NPT Male | ||||
---|---|---|---|---|
1/8 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1/4 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
3/8 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
1/2 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
3/4 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
1 | Solid | 150 psi @ 72° F | 000000000 | 0000 |
1 1/4 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
1 1/2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
2 1/2 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
3 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
4 | Solid | 150 psi @ 72° F | 000000000 | 00000 |
6 | Solid | 150 psi @ 72° F | 000000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/446/4464k563-@halfx_637626522144746287.png?ver=imagenotfound)
- For Use With: Air, Water, Hydraulic Fluid
- Specifications Met: ASME B1.20.1, ASME B16.11, ASTM B221, Fed. Spec. QQ-A-200/8
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 80 aluminum
Black Anodized 2011 Aluminum | |||||
---|---|---|---|---|---|
Pipe Size | Drive Size | Plug Construction | Max. Pressure | Each | |
NPT Male | |||||
1/16 | 5/32" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
1/8 | 3/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
1/4 | 1/4" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
3/8 | 5/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
1/2 | 3/8" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
3/4 | 9/16" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
1 | 5/8" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
1 1/4 | 3/4" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
BSPT Male | |||||
1/8 | 3/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
1/4 | 1/4" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
3/8 | 5/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
1/2 | 3/8" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/386/3867t66-@halfx_637666027170525846.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/386/3867t375-@halfx_637092495503089729.png?ver=imagenotfound)
- For Use With: Air, Water, Hydraulic Fluid
- Specifications Met: ASME B1.20.1, ASME B16.11, ASTM B221, Fed. Spec. QQ-A-200/8
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 80 aluminum
Pressure Class | Pipe Size | Thread Size | Thread Pitch, mm | Drive Size | Plug Construction | Max. Pressure | Each | |
NPT Male | ||||||||
---|---|---|---|---|---|---|---|---|
150 | 1/16 | __ | __ | 5/16" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
Metric Male | ||||||||
150 | __ | M3 | 0.5 | 1/4" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | M6 | 1 | 7/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | M10 | 1.25 | 5/8" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | M12 | 1.25 | 11/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
UNF Male | ||||||||
150 | __ | 10-32 | __ | 5/16" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | 7/16"-20 | __ | 5/8" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | 9/16"-18 | __ | 3/4" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
150 | __ | 3/4"-16 | __ | 1 1/4" | Solid | 150 psi @ 72° F | 00000000 | 0000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/791/7919n119multipositive_front_positive_right_flop15_1617397745_361@halfx_637529766906115851.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/791/7919n119-@halfx_637532073141638116.png?ver=imagenotfound)
Male Threads
with Gasket
- For Use With: Air, Oil, Water
- Specifications Met: DIN 3852
- Pipe Nipples and Pipe: Use aluminum
Black Anodized Aluminum Alloy | Aluminum Alloy | ||||||||
---|---|---|---|---|---|---|---|---|---|
Pipe Size | Thread Size | Thread Pitch, mm | Drive Size | Plug Construction | Max. Pressure | Each | Each | ||
BSPP Male | |||||||||
1/4 | __ | __ | 15 mm | Solid | Not Rated | 00000000 | 000000 | 00000000 | 00000 |
3/8 | __ | __ | 18 mm | Solid | Not Rated | 000000 | 00 | 00000000 | 0000 |
1/2 | __ | __ | 21 mm | Solid | Not Rated | 000000 | 00 | 00000000 | 0000 |
3/4 | __ | __ | 27 mm | Solid | Not Rated | 000000 | 00 | 00000000 | 00000 |
1 | __ | __ | 32 mm | Solid | Not Rated | 000000 | 00 | 00000000 | 00000 |
1 1/2 | __ | __ | 50 mm | Solid | Not Rated | 00000000 | 00000 | 00000000 | 00000 |
Metric Male | |||||||||
1/4 | M14 | 1.5 | 15 mm | Solid | Not Rated | 00000000 | 00000 | 00000000 | 0000 |
3/8 | M16 | 1.5 | 18 mm | Solid | Not Rated | 00000000 | 00000 | 00000000 | 0000 |
1/2 | M20 | 1.5 | 21 mm | Solid | Not Rated | 00000000 | 00000 | 00000000 | 0000 |
3/4 | M26 | 1.5 | 27 mm | Solid | Not Rated | 00000000 | 00000 | 000000 | 00 |
1 | M33 | 1.5 | 32 mm | Solid | Not Rated | 00000000 | 00000 | 00000000 | 00000 |
1 1/4 | M42 | 1.5 | 41 mm | Solid | Not Rated | 000000 | 00 | 00000000 | 00000 |
1 1/4 | M42 | 2 | 41 mm | Solid | Not Rated | 00000000 | 00000 | 000000 | 00 |
High-Pressure Aluminum Threaded Pipe Fittings
Also known as Pressure Class 3000 fittings, these have the highest pressure rating of all the aluminum pipe fittings we offer. They are lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/386/3867t66-@halfx_637666027170525846.png?ver=imagenotfound)
- For Use With: Air, Water
- Pressure Class : 3000
- Specifications Met: Fed. Spec. QQ-A-200/8, ASTM B221, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 aluminum
![](/prerenderstable/mvPRE/contents/gfx/imagecache/386/3867t56-@halfx_637666025343631918.png?ver=imagenotfound)
- For Use With: Air, Water
- Pressure Class : 3000
- Specifications Met: Fed. Spec. QQ-A-200/8, ASTM B221, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 aluminum
Medium-Pressure Aluminum Threaded Pipe Fittings
Designed for medium-pressure applications, these fittings have better strength than our low-pressure aluminum pipe fittings. They are lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/447/44705k384-@halfx_637661948522390903.png?ver=imagenotfound)
- For Use With: Air, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 Aluminum
Pipe Size | Plug Construction | Max. Pressure | Each | |
BSPT Male | ||||
---|---|---|---|---|
1/8 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
1/4 | Solid | 250 psi @ 72° F | 0000000 | 0000 |
3/8 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
1/2 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
3/4 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
1 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
1 1/2 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
2 | Solid | 250 psi @ 72° F | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/349/3494n282multipositive_right_negative_top_flop15_1614365100_513@halfx_637499404137359789.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/512/51205k269-@halfx_637666186933634667.png?ver=imagenotfound)
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Vacuum: 27 in. of Hg @ 72 ° F
Thread Size | Thread Pitch, mm | Drive Size | Plug Construction | Max. Pressure | Each | |
Metric Male | ||||||
---|---|---|---|---|---|---|
M5 | 0.8 | 8 mm | Solid | 1,000 psi @ 72° F | 00000000 | 00000 |
M8 | 1.25 | 14 mm | Solid | 1,000 psi @ 72° F | 00000000 | 0000 |
M14 | 1.5 | 19 mm | Solid | 1,000 psi @ 72° F | 00000000 | 0000 |
M16 | 1.5 | 22 mm | Solid | 1,000 psi @ 72° F | 00000000 | 00000 |
M18 | 1.5 | 25 mm | Solid | 1,000 psi @ 72° F | 00000000 | 00000 |
M20 | 1.5 | 25 mm | Solid | 1,000 psi @ 72° F | 00000000 | 00000 |
M22 | 1.5 | 29 mm | Solid | 1,000 psi @ 72° F | 00000000 | 00000 |
37° Flared Fittings for Aluminum Tubing
![](/prerenderstable/mvPRE/contents/gfx/imagecache/222/2227k82-1633697317-p9@halfx_637692761356643819.png?ver=imagenotfound)
- For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
- Temperature Range: -60° to 400° F
- Tubing: Use with seamless aluminum
Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. Fittings are aluminum, which is lightweight with good corrosion resistance. They require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/222/2227k52-@halfx_637763852572148056.png?ver=imagenotfound)
For Tube OD | Material | Max. Pressure | Each | |
1/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 00000 |
3/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1/2" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
5/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
3/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/222/2227k62-@halfx_637763853500839046.png?ver=imagenotfound)
For Tube OD | Nut Material | Max. Pressure | Each | |
1/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 00000 |
3/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1/2" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
5/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
3/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 0000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/222/2227k72-@halfx_637763854491899697.png?ver=imagenotfound)
For Tube OD | Sleeve Material | Max. Pressure | Each | |
1/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 00000 |
3/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1/2" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
5/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
3/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 0000 |