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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Tapered Caps
These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.
For technical drawings and 3-D models, click on a part number.
| For OD | For Pipe Size  | Inside Ht. | Max. Temp., °F | Color | Pkg. Qty. | Pkg. | |
Flexible Polyethylene Plastic | |||||||
|---|---|---|---|---|---|---|---|
| 0.298"-0.365" | 1/16 | 3/8" | 150° | Red | 100 | 00000000 | 00000 |
Low-Pressure Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line. 316 stainless steel fittings have excellent corrosion resistance.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class:
NPTF: 150 - Specifications Met:
Metric and BSPP: DIN 908 - Pipe Nipples and Pipe:
NPTF: Use Schedule 40 stainless steel - Flanges:
NPTF: Use Class 150 stainless steel
Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings
Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | ||||
|---|---|---|---|---|
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | ||||
| 1/16 | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 000000000 | 000000 |
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met:
1/2 Pipe Size: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479
All other sizes: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
| 1/16 | 5/32" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 000000 |
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met:
NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
BSPT: ISO 7-1
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
| 1/16 | Hollow | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 00000 |
High-Pressure Stainless Steel Threaded Pipe Fittings
Use these heavy duty fittings in high-pressure flow applications.
347 stainless steel fittings have excellent corrosion resistance and can withstand prolonged heat exposure.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: MS27769, SAE AS4842, SAE AS71051
347 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
| 1/16 | 5/32" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 00000 |
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
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Gasket Material | Each | |
303 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
NPT Male | ||||||
| 1/16 | 5/16" | 500 psi @ 72° F | 100 psi @ 350° F | __ | 00000000 | 00000 |
BSPP Male | ||||||
| 1/16 | 1/2" | 500 psi @ 72° F | 100 psi @ 350° F | Fluoroelastomer Rubber | 00000000 | 00000 |
BSPT Male | ||||||
| 1/16 | 5/16" | 500 psi @ 72° F | 100 psi @ 350° F | __ | 00000000 | 0000 |
316 Stainless Steel | ||||||
NPT Male | ||||||
| 1/16 | 5/16" | 500 psi @ 72° F | 100 psi @ 350° F | __ | 00000000 | 00000 |
BSPP Male | ||||||
| 1/16 | 1/2" | 500 psi @ 72° F | 100 psi @ 350° F | Fluoroelastomer Rubber | 00000000 | 00000 |
BSPT Male | ||||||
| 1/16 | 5/16" | 500 psi @ 72° F | 100 psi @ 350° F | __ | 00000000 | 00000 |
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings with Sealant
The male threads on these fittings have a sealant applied for extra leak protection. Fittings are made of galvanized iron or steel, which have fair corrosion resistance. Also known as Pressure Class 125 or 150 fittings, they are for use in low-pressure applications.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Natural Gas, Steam, Water
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | ||||||
|---|---|---|---|---|---|---|
| 1/16 | 5/32" | Not Rated | Not Rated | SAE J531 | 0000000 | 00000 |
Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With:
NPTF and UN/UNF (SAE Straight): Air, Hydraulic Fluid, Water
Metric, BSPP and BSPT: Air, Hydraulic Fluid, Oil, Water - Specifications Met: See table
| Pipe Size | Drive Size | Max. Pressure | Material | Specifications Met | Each | |
NPTF Male | ||||||
|---|---|---|---|---|---|---|
| 1/16 | 5/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
Compact Precision Extreme-Pressure Steel Threaded Pipe Fittings
Made to tighter tolerances than other steel pipe fittings, these are also known as instrumentation fittings. They are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized steel, which has fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Water, Hydraulic Fluid
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108
| Pipe Size | Max. Pressure | Each | |
NPT Male | |||
|---|---|---|---|
| 1/16 | 10,000 psi @ 72° F | 00000000 | 000000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications. PTFE-coated steel fittings have better corrosion resistance than galvanized and zinc-plated steel fittings.
Plugs with a 7/8" taper sit flush to the surface for a low profile.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range: -100° to 450° F
- Specifications Met: ASTM A574, ASME B1.20.3
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
High-Pressure Brass Threaded Pipe Fittings
These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
| Pipe Size | Drive Size | Max. Pressure | Each | |
NPT Male | ||||
|---|---|---|---|---|
| 1/16 | 5/32" | 1,000 psi @ 72° F | 000000000 | 00000 |
High-Pressure Brass Threaded Pipe Fittings with Sealant
Not only do these fittings have the strength to handle high-pressure applications, the male threads have a sealant applied for extra protection against leaks. Fittings are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
| Pipe Size | Drive Size | Max. Pressure | Each | |
NPT Male | ||||
|---|---|---|---|---|
| 1/16 | 5/32" | 1,000 psi @ 72° F | 000000000 | 00000 |
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.
For technical drawings and 3-D models, click on a part number.
- 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 |
- 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 | Drive Size | Plug Construction | Max. Pressure | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 150 | 1/16 | 5/16" | Solid | 150 psi @ 72° F | 00000000 | 00000 |
Plastic Pipe Fittings for Oil
Made of corrosion-resistant plastic, these fittings won’t deteriorate when used in oil applications. They also have high strength and impact resistance. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.
- For Use With: Oil
- Temperature Range: See table
| Pipe Size | Drive Size | Material | Color | Max. Pressure | Minimum Temperature, °F | Maximum Temperature, °F | Each | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/16 | 5/16" | PVDF Plastic | White | Not Rated | Not Rated | Not Rated | 0000000 | 00000 |
Breather Vents
Protect against excess vacuum and pressure in cylinders, gear boxes, enclosures, manifolds, and tanks. You can also use these breather vents to block debris from entering equipment.
For technical drawings and 3-D models, click on a part number.
| Style | Pipe Size | Max. Flow Rate | Max. Pressure, psi | Max. Temp., °F | Ht. | For Use With | Removes Particle Size Down To, microns | Each | |
NPT Male | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Brass Body and Fitting | |||||||||
| A | 1/16 | 13 scfm @ 100 psi | 150 | 300° | 1/2" | Air, Inert Gas | 90 | 0000000 | 00000 |