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 Stainless Steel Unthreaded Pipe Flanges
Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Reducing flanges let you transition your piping system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions. Forged flanges have better strength than cast flanges. Cast flanges are also called MSS flanges.
304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Oil, Natural Gas
- Pressure Class: 150
- Specifications Met: ASTM A182, ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
304/304L Stainless Steel | ||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 12 | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 |
316/316L Stainless Steel | ||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 12 | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: DIN EN 1092-1
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | DN Flange Size | Flange OD, mm | For Bolt Dia., mm | Dia., mm | No. of | Bolt Circle Dia., mm | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
| 1 | 25 | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 0000000 |
| 2 | 50 | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 6 | 150 | 285 | 20 | 22 | 8 | 240 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
| 1 | 25 | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 2 | 50 | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met: ASME B16.5
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | For Flange Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Diameter | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
| 3/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 1 1/2 | 5" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 1/2 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 6 | 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
316/316L Stainless Steel | ||||||||||
| 3/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 1 1/2 | 5" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 1/2 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
- For Use With: Air, Water, Natural Gas, Oil
- Pressure Class: 150
- Specifications Met: MSS SP-51, ASTM A351
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | 304 Stainless Steel | 316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | Each | ||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 000000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 000000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
High-Pressure Stainless Steel Unthreaded Pipe Flanges
Use these heavy duty forged flanges for high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of same size together with a gasket (sold separately) to create an access point in a pipe line.
304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: ASME B16.5, ASTM A182 - Certification:: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Fittings: Use Schedule 40 stainless steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Each | |
304/304L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 600 psi @ 72° F | 300 psi @ 360° F | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 00000000 | 000000 |
| 3/4 | 12 | 600 psi @ 72° F | 300 psi @ 360° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 00000000 | 00000 |
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 |
| 1 1/4 | 20 | 600 psi @ 72° F | 300 psi @ 360° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 00000000 | 00000 |
| 1 1/2 | 24 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 00000000 | 000000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 |
| 2 1/2 | 40 | 600 psi @ 72° F | 300 psi @ 360° F | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 00000000 | 000000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 |
| 4 | 64 | 600 psi @ 72° F | 300 psi @ 360° F | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 00000000 | 000000 |
| 6 | 96 | 600 psi @ 72° F | 300 psi @ 360° F | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 00000000 | 000000 |
| 8 | __ | 600 psi @ 72° F | 300 psi @ 360° F | 15" | 7/8" | 1" | 12 | 13" | 0000000 | 000000 |
Pressure Class 600 | ||||||||||
| 1 | 16 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 0000000 | 00000 |
| 1 1/2 | 24 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 0000000 | 000000 |
| 2 | 32 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 0000000 | 000000 |
| 3 | 48 | 1,200 psi @ 72° F | 840 psi @ 400° F | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 0000000 | 000000 |
| 4 | 64 | 1,200 psi @ 72° F | 840 psi @ 400° F | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 600 psi @ 72° F | 300 psi @ 360° F | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 00000000 | 00000 |
| 3/4 | 12 | 600 psi @ 72° F | 300 psi @ 360° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 00000000 | 00000 |
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 |
| 1 1/4 | 20 | 600 psi @ 72° F | 300 psi @ 360° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 00000000 | 000000 |
| 1 1/2 | 24 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 00000000 | 000000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 |
| 2 1/2 | 40 | 600 psi @ 72° F | 300 psi @ 360° F | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 00000000 | 000000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 |
| 4 | 64 | 600 psi @ 72° F | 300 psi @ 360° F | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 00000000 | 000000 |
| 6 | 96 | 600 psi @ 72° F | 300 psi @ 360° F | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 00000000 | 000000 |
Pressure Class 600 | ||||||||||
| 3/4 | 12 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 0000000 | 00000 |
| 1 | 16 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 0000000 | 00000 |
| 2 | 32 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 0000000 | 000000 |
Flow-Control Flange Unions
Measure, throttle, and regulate the flow of liquids and gases in your line by adding an orifice plate to these unions. They consist of two flange halves, plus all of the components needed to connect them together. Tighten the jack bolts to separate the flange halves to inspect or replace the orifice plate.
To throttle flow, mount an orifice plate between the two flanges. The orifice plate restricts the flow in order to regulate it.
To measure flow, build the same assembly, except you’ll also connect a differential pressure gauge or transmitter to both flange halves using the threaded ports. Your gauge or transmitter will measure the difference between the pressure before and after the orifice plate. The pressure difference is proportional to flow rate, so you can use that measurement to calculate your line’s flow rate.
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
316/316L stainless steel flanges have excellent corrosion resistance.
Flanges that meet ASME B16.36 adhere to specifications and testing requirements for temperature and pressure ratings, dimensions, materials, and tolerances.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
- Temperature Range: Not Rated
- Specifications Met: See table
- Pressure Class: 300
- Fittings:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel - Pipe Nipples and Pipe:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel
Bolt Hole | Port | 316/316L Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Pipe Size | No. of | Includes | Specifications Met | Each | |
| 3/4 | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 0000000 |
| 1 | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
| 4 | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |