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 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
304/304L Stainless Steel | 316/316L Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
Pipe Size | Wall Thick. | Lg. | Construction | Each | Each | ||
| 1/2 | 0.109" | 1 1/2" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 0.113" | 1 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.133" | 1 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.14" | 1 7/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 0.145" | 2 1/4" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.154" | 3" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.203" | 3 3/4" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 0.216" | 4 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 0.237" | 6" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 6 | 0.28" | 9" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.322" | 12" | 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 | ||
316/316L 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 1/2 | 0.109" | 2 7/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.109" | 3 5/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 0.12" | 5" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 4 | 0.12" | 6 3/16" | Welded | 000000000 | 00000 | 000000000 | 000000 |
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
Pipe Size | Wall Thick. | 316/316L Stainless Steel | ||||
|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Construction | Each | |
| 3/4 | 1/2 | 0.083" | 0.083" | Welded | 000000000 | 000000 |
| 1 | 3/4 | 0.109" | 0.083" | Welded | 000000000 | 00000 |
| 1 1/2 | 1 | 0.109" | 0.109" | Welded | 000000000 | 00000 |
| 2 | 1 | 0.109" | 0.109" | Welded | 000000000 | 00000 |
| 2 | 1 1/2 | 0.109" | 0.109" | Welded | 000000000 | 00000 |
| 3 | 2 | 0.12" | 0.109" | Welded | 000000000 | 00000 |
| 4 | 3 | 0.12" | 0.12" | Welded | 000000000 | 00000 |
- 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. | Lg. | Construction | Each | Each | ||
| 1/2 | 0.083" | 1 1/2" | Welded | 000000000 | 00000 | 000000000 | 000000 |
| 3/4 | 0.083" | 1 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 0.109" | 1 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 0.109" | 1 7/8" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 0.109" | 2 1/4" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 0.109" | 3" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 0.12" | 3 3/4" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 0.12" | 4 1/2" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 0.12" | 6" | Welded | 000000000 | 00000 | 000000000 | 00000 |
| 6 | 0.134" | 9" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 0.148" | 12" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 10 | 0.165" | 15" | Welded | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 0.18" | 18" | Welded | 000000000 | 000000 | 000000000 | 00000000 |
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
- For Use With: Air, Natural Gas, Oil, Water
- Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
- Pipe: Use Schedule 10 stainless steel
Butt-Weld Fittings for Stainless Steel Tubing
- For Use With: See table
- Temperature Range: See table
- Tubing:
304 Stainless Steel: Use with 304/304L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except DIN EN 10357 fittings with only ASTM A269 or ASTM A270
316 Stainless Steel: Use with 316/316L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except ASME BPE and DIN EN 10357 fittings with only ASTM A269 or ASTM A270 - Specifications Met: See table
Weld these fittings to tubing for a permanent, flush connection that permits smooth flow through a line.
316 stainless steel fittings have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
316/316L Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Max. Pressure | Max. Vacuum | Temp. Range, °F | Lg. | Wall Thick. | For Use With | Specifications Met | Each | |
Polished | |||||||||
| 1 1/2" | 300 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 12" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 0000000 |
| 2" | 270 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 12" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
| 2 1/2" | 220 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 18" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
| 3" | 170 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 18" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
| 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 18" | 0.083" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
Dull | |||||||||
| 1 1/2" | 300 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 12" | 0.065" | Air, Food, Water | __ | 00000000 | 000000 |
| 2" | 270 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 12" | 0.065" | Air, Food, Water | __ | 00000000 | 000000 |
| 3" | 170 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 18" | 0.065" | Air, Food, Water | __ | 00000000 | 000000 |
| 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 18" | 0.083" | Air, Food, Water | __ | 00000000 | 000000 |
316/316L Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Max. Pressure | Max. Vacuum | Temp. Range, °F | Length (A) | Wall Thick. | For Use With | Specifications Met | Each | |
Polished | |||||||||
| 1 1/2" | 300 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 4 15/16" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 0000000 |
| 2" | 270 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 4 15/16" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
| 3" | 170 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 7 7/16" | 0.065" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
| 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 35° to 250° | 7 7/16" | 0.083" | Dairy, Food | 3-A Certified 63-03 | 00000000 | 000000 |
Stainless Steel Push-to-Connect Tube Fittings for Air and Water
UN/UNF (SAE Straight)
Male Threads with Gasket
- Temperature Range: -10° to 300° F,
except ISO 14743 fittings: 5° to 390° F - Tubing: Use with firm or hard (Durometer 95A-72D) nylon plastic or polyurethane rubber,
except ISO 14743 fittings: Use with firm (Durometer 85A-100A) nylon plastic or polyurethane rubber
Made entirely of stainless steel, these fittings have the best corrosion resistance of all our metal push-to-connect fittings. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting.
Metric male threads have either a gasket or thread sealant to protect against leaks.
For technical drawings and 3-D models, click on a part number.
UN/UNF (SAE Straight)
Male Threads with Gasket
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube OD, mm | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Each | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 6 | 1/8 | __ | 316 Stainless Steel | __ | 435 psi @ 72° F | 000000000 | 000000 |
| 8 | 1/4 | __ | 316 Stainless Steel | __ | 435 psi @ 72° F | 000000000 | 00000 |
Metric Threads | |||||||
| 4 | __ | M5 | 316 Stainless Steel | Fluoroelastomer Rubber | 435 psi @ 72° F | 000000000 | 00000 |
| 6 | __ | M5 | 316 Stainless Steel | Fluoroelastomer Rubber | 435 psi @ 72° F | 000000000 | 00000 |