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.
More
Extreme-Pressure Steel Unthreaded Pipe Flanges
For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point in a pipe line. They are for noncorrosive environments.
Cap flanges are also known as blind flanges.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class : 1500
- Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Fittings: Use Class 6000 steel
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | For Pipe Schedule | Each | |
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Any | 0000000 | 0000000 |
High-Pressure Steel Threaded Pipe Flanges
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 1500
- Specifications Met:
1/2 to 2 Pipe Sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
All other sizes: ASTM A105 - Pipe Nipples and Pipe: Use Schedule 160 or XXH steel
- Fittings: Use Class 3000 or 6000 iron and steel
Also known as Pressure Class 1500 flanges, these have the strength to handle high pressures. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are for use in noncorrosive environments.
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT | |||||||||||
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Steel | 0000000 | 0000000 |
High-Purity Polypropylene Pipe Flanges for Corrosive Chemicals
- For Use With: Deionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents
- Pressure Class: 150
- Temperature Range: 32° to 200° F
- Specifications Met: ASTM D2837, ASTM D4101, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, ISO 7279, NSF/ANSI 61
- Pipe Nipples and Pipe: Use SDR 11 Polypropylene Plastic
- Fittings: Use Polypropylene Plastic
The inside of these flanges won’t leach contaminants into your line or accumulate particles—they’re polished to an ultra-smooth 12 Ra finish, which also makes them easy to clean. Made of polypropylene, they resist organic solvents, acids, and alkalis better than CPVC pipe flanges. Bolt two same-size flanges together with a gasket (not included) to create an access point in your line. These flanges meet NSF/ANSI 61 for use with drinking water, and they’re FDA compliant for direct contact with food. They also meet ASTM requirements for material and performance, and ISO requirements for dimensions.
Also known as lap-joint flanges, they connect to pipe with stub-end straight adapters (not included). Slide the stub end adapter into your flange and weld to your pipe with socket fusion. Since the flange isn’t welded to the pipe, it can be disconnected easily for cleaning and inspecting.