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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Standard-Wall Butt-Weld Stainless Steel Unthreaded Pipe Fittings
Also known as Schedule 40 fittings, these have thicker walls than our thin-wall stainless steel unthreaded butt-weld fittings. They have beveled ends that, when flush to pipe, create a trough for a strong weld that permits maximum flow.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
304/304L Stainless Steel | 316/316L Stainless Steel | |||||
|---|---|---|---|---|---|---|
Pipe Size | Wall Thick. | Construction | Each | Each | ||
| 1/2 | 0.109" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 0.113" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.133" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.14" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 0.145" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.154" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.203" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 0.216" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 0.237" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 6 | 0.28" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.322" | Welded | 000000000 | 000000 | 000000000 | 000000 |
Low-Pressure Stainless Steel Unthreaded Pipe Flanges
Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a
Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld. Long-neck weld flanges have a square-cut end for welding directly to a pressure vessel or tank. With a longer neck than butt-weld flanges, they stick out farther from your tank wall for easier access to bolts. These flanges eliminate the need to weld a flange to a length of pipe.
Forged flanges have better strength than cast flanges. 304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.
- 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 | Construction | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
304/304L Stainless Steel | |||||||||
| 1/2 | Seamless | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 12 | Seamless | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 |
316/316L Stainless Steel | |||||||||
| 1/2 | Seamless | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 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 | Construction | 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 | Seamless | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 0000000 |
| 2 | 50 | Seamless | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | Seamless | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | Seamless | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
316/316L Stainless Steel | |||||||||||
| 1 | 25 | Seamless | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASME B16.5, ASTM A182
- Certification: Material Certificate with Traceable Lot Number and Test Report
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Construction | Flange OD | Overall Lg. | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | |||||||||||
| 1 | Seamless | 4 1/4" | 9" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 0000000 |
| 1 1/2 | Seamless | 5" | 9" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 2 | Seamless | 6" | 9" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 12" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 12" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 00000000 |
| 6 | Seamless | 11" | 12" | 3/4" | 0.88" | 8 | 9 1/2" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 00000000 |
316/316L Stainless Steel | |||||||||||
| 1 | Seamless | 4 1/4" | 9" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 1 1/2 | Seamless | 5" | 9" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 2 | Seamless | 6" | 9" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 12" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 12" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 00000000 |
| 6 | Seamless | 11" | 12" | 3/4" | 0.88" | 8 | 9 1/2" | 230 psi @ 72° F | 175 psi @ 300° F | 000000000 | 00000000 |
Thin-Wall Butt-Weld Stainless Steel Unthreaded Pipe Fittings
Also known as Schedule 10 fittings, these are thin and lightweight. They have beveled ends that, when flush to pipe, create a trough for a strong weld that permits maximum flow.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
304/304L Stainless Steel | 316/316L Stainless Steel | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Construction | Each | Each | ||
| 1/2 | 0.083" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 0.083" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.109" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.109" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 1 1/2 | 0.109" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.109" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.12" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 0.12" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 0.12" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 6 | 0.134" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 8 | 0.148" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 10 | 0.165" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 0.18" | Welded | 000000000 | 000000 | 000000000 | 000000 |
Thick-Wall Butt-Weld Stainless Steel Unthreaded Pipe Fittings
With a thicker wall than our standard-wall butt-weld pipe fittings, these offer high strength while providing a smooth connection for maximum flow. They have beveled ends that, when flush to pipe, create a trough for a leak-resistant, permanent weld.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A403
- Pipe Nipples and Pipe: Use Schedule 80 stainless steel
- Fittings: Use Class 300 or 600 stainless steel
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.
Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld.
- 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 | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
Pressure Class 600 | ||||||||||
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 00000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
| 4 | 64 | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 00000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 600 psi @ 72° F | 415 psi @ 360° F | 00000000 | 000000 |
Pressure Class 600 | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 1,200 psi @ 72° F | 825 psi @ 400° F | 0000000 | 000000 |