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.
Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.
For technical drawings and 3-D models, click on a part number.
- 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
Fittings | Flanges | |||||
|---|---|---|---|---|---|---|
Pipe Size | Wall Thick. | Construction | Each | Each | ||
304/304L Stainless Steel | ||||||
| 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 | 000000 |
| 3 | 0.216" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 4 | 0.237" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 6 | 0.28" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.322" | Welded | 000000000 | 000000 | 000000000 | 000000 |
316/316L Stainless Steel | ||||||
| 1/2 | 0.109" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 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 | 000000 |
| 3 | 0.216" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 4 | 0.237" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 6 | 0.28" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.322" | Welded | 000000000 | 000000 | 000000000 | 000000 |
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.
Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
Straight Adapters | Flanges | ||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Flange OD | Construction | Each | Each | ||
304/304L Stainless Steel | |||||||
| 1/2 | 0.083" | 1 3/8" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 0.083" | 1 11/16" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.109" | 2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.109" | 2 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 0.109" | 2 7/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.109" | 3 5/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.12" | 4 1/8" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 3 | 0.12" | 5" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 4 | 0.12" | 6 3/16" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 6 | 0.134" | 8 1/2" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.148" | 10 5/8" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 10 | 0.134" | 12 3/4" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 0.156" | 15" | Welded | 000000000 | 000000 | 000000000 | 000000 |
316/316L Stainless Steel | |||||||
| 1/2 | 0.083" | 1 3/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3/4 | 0.083" | 1 11/16" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.109" | 2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.109" | 2 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 0.109" | 2 7/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.109" | 3 5/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.12" | 4 1/8" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 3 | 0.12" | 5" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 4 | 0.12" | 6 3/16" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 6 | 0.134" | 8 1/2" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.148" | 10 5/8" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 0.18" | 15" | Welded | 000000000 | 000000 | 000000000 | 000000 |
Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings
Butt-weld fittings allow for a smooth connection that provides maximum flow. They have beveled ends that, when flush to pipe, create a trough for a strong, permanent weld. Fittings are also known as Schedule 40. They are for use in noncorrosive environments.
Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Specifications Met: ASTM A234, ASME B16.9
- Pipe Nipples and Pipe: Use Schedule 40 Steel
- Flanges: Use Class 150 Steel
Straight Adapters | Flanges | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Construction | Each | Each | ||
| 1/2 | 0.109" | Seamless | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 0.113" | Seamless | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.133" | Seamless | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.14" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 1 1/2 | 0.145" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 2 | 0.154" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 2 1/2 | 0.203" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 3 | 0.216" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 4 | 0.237" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 6 | 0.28" | Seamless | 000000000 | 000000 | 000000000 | 00000 |
| 8 | 0.322" | Seamless | 000000000 | 000000 | 000000000 | 000000 |
Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings
With thicker, stronger walls than our standard-wall butt-weld pipe fittings, these fittings stand up to your high strength applications. Weld them flush against pipe for a smooth connection that permits maximum flow. These fittings have beveled ends that create a trough for a leak-resistant, permanent weld. Made of steel, they’re for use in noncorrosive environments.
Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting. Bolt flanges together with a gasket.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Specifications Met: ASTM A234
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 steel
Adapters | Flanges | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Construction | Each | Each | ||
| 1/2 | 0.147" | Seamless | 00000000 | 000000 | 00000000 | 000000 |
| 3/4 | 0.154" | Seamless | 00000000 | 00000 | 00000000 | 00000 |
| 1 | 0.179" | Seamless | 00000000 | 00000 | 00000000 | 00000 |
| 1 1/4 | 0.191" | Seamless | 00000000 | 00000 | 00000000 | 00000 |
| 1 1/2 | 0.2" | Seamless | 00000000 | 00000 | 00000000 | 00000 |
| 2 | 0.218" | Seamless | 00000000 | 000000 | 00000000 | 00000 |
| 2 1/2 | 0.276" | Seamless | 00000000 | 000000 | 00000000 | 00000 |
| 3 | 0.3" | Seamless | 00000000 | 000000 | 00000000 | 00000 |
| 4 | 0.337" | Seamless | 00000000 | 000000 | 00000000 | 000000 |
| 5 | 0.375" | Seamless | 00000000 | 000000 | 00000000 | 000000 |
| 6 | 0.432" | Seamless | 00000000 | 000000 | 00000000 | 000000 |
| 8 | 0.5" | Seamless | 00000000 | 000000 | 00000000 | 000000 |
High-Purity PVDF Pipe Fittings for Corrosive Chemicals
Made of PVDF that’s finished to a 12 Ra smoothness, these fittings handle some of the harshest chemicals without leaching contaminants into your line. They won’t accumulate particles and are easy to clean, thanks to their smoothness. Comparable to Kynar, these fittings handle most organic solvents that would dissolve CPVC, and chlorine or nitric acid that would weaken polypropylene. You can use them at higher temperatures than CPVC and polypropylene. These fittings meet UL 94 V-0 and FM standards for flame retardance. They’re also FDA compliant for direct contact with food, and they meet ASTM requirements for dimensions and tolerances.
Connect them to pipe with socket fusion welding for a strong, permanent bond. Use a socket fusion tool with a heater bushing (sold separately) that matches your pipe size.
For technical drawings and 3-D models, click on a part number.
Adapter
with Flange
- For Use With: Chlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents
- Temperature Range: -40° to 270° F
- Specifications Met: ASTM D3261, FDA Compliant 21 CFR 177.2510, FM 4910, UL 94 V-0
- Pipe Nipples and Pipe: Use SDR 21 PVDF Plastic
- Flanges: Use Polypropylene Plastic
Stub-end straight adapters connect flanges to pipe. Slide the straight end into a flange and fuse the stub end to the pipe. Since the flange isn’t fused to the pipe, it can be disconnected easily for cleaning and inspecting.
Adapters | Flanges | |||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Material | Color | Max. Pressure | Each | Each | ||
| 1/2 | 0.119" | PVDF Plastic | White | 230 psi @ 72° F | 0000000 | 000000 | 0000000 | 000000 |
| 3/4 | 0.138" | PVDF Plastic | White | 230 psi @ 72° F | 0000000 | 00000 | 0000000 | 00000 |
| 1 | 0.138" | PVDF Plastic | White | 230 psi @ 72° F | 0000000 | 00000 | 0000000 | 00000 |
| 1 1/2 | 0.195" | PVDF Plastic | White | 230 psi @ 72° F | 0000000 | 000000 | 0000000 | 00000 |
| 2 | 0.178" | PVDF Plastic | White | 230 psi @ 72° F | 0000000 | 000000 | 0000000 | 00000 |
- For Use With: Chlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents
- Temperature Range: -40° to 270° F
- Specifications Met: ASTM D3222, FDA Compliant 21 CFR 177.2510, FM 4910, UL 94 V-0
- Seal Material: Viton® Fluoroelastomer Rubber
- Seat Material: PTFE Plastic
Add a ball valve to control the flow in your line.
| Pipe Size | Flow Coefficient (Cv) | Vacuum Rating, in. of Hg | Port Type | End-to-End Lg. | Color | Max. Pressure | Each | |
PVDF Plastic | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/2 | 12.5 | 29.92 | Full | 3 13/16" | White | 230 psi @ 72° F | 0000000 | 0000000 |
| 3/4 | 28 | 29.92 | Full | 4 9/32" | White | 230 psi @ 72° F | 0000000 | 000000 |
| 1 | 50.9 | 29.92 | Full | 4 23/32" | White | 230 psi @ 72° F | 0000000 | 000000 |
| 1 1/2 | 150 | 29.92 | Full | 6 1/16" | White | 230 psi @ 72° F | 0000000 | 00000000 |
| 2 | 230 | 29.92 | Full | 6 13/16" | White | 230 psi @ 72° F | 0000000 | 00000000 |
| Includes | Each | |
| 5 Bushing Sets (1 each in 1/2, 3/4, 1, 1 1/2, and 2 Pipe Sizes) | 00000000 | 0000000 |
High-Purity Polypropylene Pipe Fittings for Corrosive Chemicals
The inside of these fittings 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 fittings. These fittings 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.
Connect them to pipe with socket fusion welding for a strong, permanent bond. Use a socket fusion tool with a heater bushing (sold separately) that matches your pipe size.
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: Deionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents
- 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
- Flanges: Use Polypropylene Plastic
Stub-end straight adapters connect flanges to pipe. Slide the straight end into a flange and fuse the stub end to the pipe. Since the flange isn’t fused to the pipe, it can be disconnected easily for cleaning and inspecting.
Adapters | Flanges | |||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Material | Color | Max. Pressure | Each | Each | ||
| 1/2 | 0.119" | Polypropylene Plastic | Light Gray | 150 psi @ 72° F | 00000000 | 000000 | 0000000 | 000000 |
| 3/4 | 0.138" | Polypropylene Plastic | Light Gray | 150 psi @ 72° F | 00000000 | 00000 | 0000000 | 00000 |
| 1 | 0.138" | Polypropylene Plastic | Light Gray | 150 psi @ 72° F | 00000000 | 00000 | 0000000 | 00000 |
| 1 1/2 | 0.195" | Polypropylene Plastic | Light Gray | 150 psi @ 72° F | 00000000 | 00000 | 0000000 | 00000 |
| 2 | 0.178" | Polypropylene Plastic | Light Gray | 150 psi @ 72° F | 00000000 | 00000 | 0000000 | 00000 |
- For Use With: Deionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents
- 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
- Seal Material: See table
- Seat Material: PTFE Plastic
Add a ball valve to control the flow in your line.
| Pipe Size | Flow Coefficient (Cv) | Vacuum Rating, in. of Hg | Port Type | End-to-End Lg. | Color | Max. Pressure | Each | |
EPDM Rubber Seal | ||||||||
|---|---|---|---|---|---|---|---|---|
Polypropylene Plastic | ||||||||
| 1/2 | 12.5 | 29.92 | Full | 3 13/16" | Light Gray | 150 psi @ 0° F | 00000000 | 0000000 |
| 3/4 | 28 | 29.92 | Full | 4 9/32" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 1 | 50.9 | 29.92 | Full | 4 23/32" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 1 1/2 | 150 | 29.92 | Full | 6 1/16" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 2 | 230 | 29.92 | Full | 6 13/16" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
Viton® Fluoroelastomer Rubber Seal | ||||||||
Polypropylene Plastic | ||||||||
| 1/2 | 12.5 | 29.92 | Full | 3 13/16" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 3/4 | 28 | 29.92 | Full | 4 9/32" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 1 | 50.9 | 29.92 | Full | 4 23/32" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 1 1/2 | 150 | 29.92 | Full | 6 1/16" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| 2 | 230 | 29.92 | Full | 6 13/16" | Light Gray | 150 psi @ 0° F | 00000000 | 000000 |
| Includes | Each | |
| 5 Bushing Sets (1 each in 1/2, 3/4, 1, 1 1/2, and 2 Pipe Sizes) | 00000000 | 0000000 |