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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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Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings.
NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Caps
- For Use With: Air, Hydraulic Fluid, Water
- Specifications Met: ASTM A108
Pipe Size | Dash Size | Max. Pressure | Material | Each | |
NPTF Female | |||||
|---|---|---|---|---|---|
| 1/8 | 02 | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 000000 |
| 1/4 | 04 | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 00000 |
| 3/8 | 06 | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 0000 |
| 1/2 | 08 | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 00000 |
| 3/4 | 12 | 4,800 psi @ 72° F | Zinc Plated Steel | 000000000 | 00000 |
Plugs with Hex Drive
UN/UNF
(SAE Straight) Male
Threads with Gasket
(SAE Straight) Male
Threads with Gasket
- For Use With:
NPTF and UN/UNF (SAE Straight): Air, Hydraulic Fluid, Water
Metric, BSPP and BSPT: Air, Hydraulic Fluid, Oil, Water - Specifications Met: See table
| Pipe Size | Thread Size | Dash Size | Drive Size | Max. Pressure | Material | Specifications Met | Each | |
NPTF Male | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/16 | __ | __ | 5/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
| 1/8 | __ | 02 | 3/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1/4 | __ | 04 | 1/4" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 3/8 | __ | 06 | 5/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1/2 | __ | 08 | 3/8" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 3/4 | __ | 12 | 9/16" | 5,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1 | __ | 16 | 5/8" | 4,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1 1/4 | __ | 20 | 3/4" | 3,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
| 1 1/2 | __ | 24 | 1" | 3,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
| 2 | __ | 32 | 3/4" | 2,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
UN/UNF (SAE Straight) Male | ||||||||
| __ | 3/8"-24 | 03 | 5/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 5/16"-24 | 02 | 1/8" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 7/16"-20 | 04 | 3/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 1/2"-20 | 05 | 7/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 9/16"-18 | 06 | 1/4" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 3/4"-16 | 08 | 5/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 7/8"-14 | 10 | 3/8" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 1 1/16"-12 | 12 | 9/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 1 3/16"-12 | 14 | 9/16" | 5,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| __ | 1 5/16"-12 | 16 | 5/8" | 5,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
Plugs with External Hex Drive
UN/UNF
(SAE Straight) Male
Threads with Gasket
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
| Pipe Size | Thread Size | Dash Size | Plug Construction | Max. Pressure | Material | For Use With | Specifications Met | Each | |
NPTF Male | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/8 | __ | 02 | Solid | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
| 1/4 | __ | 04 | Solid | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 3/8 | __ | 06 | Solid | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1/2 | __ | 08 | Solid | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 3/4 | __ | 12 | Hollow | 5,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1 | __ | 16 | Hollow | 4,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1 1/4 | __ | 20 | Hollow | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
| 1 1/2 | __ | 24 | Hollow | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
| 2 | __ | 32 | Hollow | 2,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
UN/UNF (SAE Straight) Male | |||||||||
| __ | 5/16"-24 | 02 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 3/8"-24 | 03 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 7/16"-20 | 04 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 1/2"-20 | 05 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 9/16"-18 | 06 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 3/4"-16 | 08 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 7/8"-14 | 10 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 1 1/16"-12 | 12 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 1 3/16"-12 | 14 | Hollow | 5,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| __ | 1 5/16"-12 | 16 | Hollow | 5,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
Plugs with External Square Drive
- For Use With: Air, Hydraulic Fluid, Water
- Specifications Met: ASTM A108
| Pipe Size | Dash Size | Plug Construction | Max. Pressure | Material | Each | |
NPTF Male | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 02 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 00000 |
| 1/4 | 04 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 000 |
| 3/8 | 06 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 0000 |
| 1/2 | 08 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 0000 |
| 3/4 | 12 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 0000 |
| 1 | 16 | Hollow | 5,000 psi @ 72° F | Zinc Plated Steel | 000000000 | 00000 |
Compact Precision Extreme-Pressure Steel Threaded Pipe Fittings
Made to tighter tolerances than other steel pipe fittings, these are also known as instrumentation fittings. They are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized steel, which has fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Plugs with Hex Drive
- For Use With: Air, Natural Gas, Water, Hydraulic Fluid
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108
Plugs with External Hex Drive
- For Use With: Air, Natural Gas, Water, Hydraulic Fluid
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108
Yor-Lok Fittings for Steel Tubing
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
- Tubing: Use with seamless steel
- Specifications Met: See table
A nut with two sleeves (ferrules) gives these fittings extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. Fittings are zinc-plated steel for fair corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.
For technical drawings and 3-D models, click on a part number.
Caps
Cap for Tubing
Cap for Fitting
Caps for tubing have a nut and a sleeve so you can close off the end of your tubing in place of a fitting. Caps for fittings replace the nut and sleeve of an existing fitting.
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Specifications Met | Each | |
Caps For Tubing | |||||||
| 1/8" | 0.035" | Zinc-Plated Steel | 6,800 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 000000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 4,900 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,100 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 2,300 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
Caps For Fitting | |||||||
| 1/8" | 0.035" | Zinc-Plated Steel | 6,800 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 4,900 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,100 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 2,300 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
| 3/4" | 0.049" | Zinc-Plated Steel | 2,200 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
| 1" | 0.065" | Zinc-Plated Steel | 2,100 psi @ 72° F | -20° to 395° | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A108 | 00000000 | 00000 |
Nuts
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Specifications Met | Each | |
| 1/8" | 0.035" | Zinc-Plated Steel | 6,800 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 4,900 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,100 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 2,300 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 3/4" | 0.049" | Zinc-Plated Steel | 2,200 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 0000 |
| 1" | 0.065" | Zinc-Plated Steel | 2,100 psi @ 72° F | -20° to 395° | ASTM A108 | 00000000 | 00000 |
Front and Back Sleeves
For Tube | ||||||||
|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Front Sleeve Material | Back Sleeve Material | Max. Pressure | Temp. Range, °F | Specifications Met | Each | |
| 1/8" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 6,800 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 1/4" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 4,850 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 0000 |
| 3/8" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 3,100 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 1/2" | 0.035" | Zinc-Plated Steel | 316 Stainless Steel | 2,300 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 3/4" | 0.049" | Zinc-Plated Steel | 316 Stainless Steel | 2,150 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |
| 1" | 0.065" | Zinc-Plated Steel | 316 Stainless Steel | 2,100 psi @ 72° F | -20° to 800° | ASME B31.3 | 00000000 | 00000 |