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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How to Measure Threaded Pipe Size
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Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
UN/UNF (SAE Straight)
Male Threads with Gasket
- Specifications Met: See table
- For Use With: See table
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size (A) | Dash Size (A) | Thread Size (B) | Max. Pressure | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × Metric Male | |||||||
| 1 5/8"-12 | 20 | M42 × 2 mm | 2,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 0000000 |
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Plugs with copper washer form a tight seal to prevent leaks. Also known as a crush washer, the washer compresses and deforms to fill gaps when tightened. Because it loses its shape when compressed, it’s not reusable. Made of copper, the washer resists rust. These plugs meet either DIN 908, DIN 909, or DIN 910, international standards for pipe plug dimensions.
- For Use With:
NPT, BSPP, and Metric: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water - Pressure Class:
NPT: 150 - Specifications Met:
BSPP and Metric: DIN 908 - Pipe Nipples and Pipe:
NPT: Use Schedule 40 steel
| Thread Size | Drive Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
Metric Male with Copper Washer | ||||||
|---|---|---|---|---|---|---|
| M42 × 1.5 mm | 22 mm | Not Rated | Not Rated | Steel | 000000000 | 000000 |
Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
DIN 3852 fittings meet DIN standards for mating surface outer diameter. They have a Buna-N rubber gasket that resists grease, hydraulic oil, and motor oil—plus mild chemicals and water. The gasket stays in a groove undercut in the mating face, which prevents it from dropping out and from extruding when fittings are tightened. Black anodized and powder-coated fittings have a decorative matte black finish.
The contact surface on fittings with a flange extends beyond the external hex drive.
Male Threads
with Gasket
- For Use With: Air, Oil, Water
- Specifications Met: DIN 3852
- Pipe Nipples and Pipe: Use aluminum
