
American Standard MECH BMI UNION | MODEL 342
Model 342
- Class
- American Standard Class 150
- Material
- Malleable iron ASTM A197/A197M
- Dimensions
- ASME B16.3, B16.14 (unions B16.39)
- Threads
- ASME B1.20.1
- Sizes
- 1/8" – 6"

Model 342
| Size | DN | A min (mm) |
|---|---|---|
| 1/8" | DN6 | 32 |
| 1/4" | DN8 | 36.5 |
| 3/8" | DN10 | 41 |
| 1/2" | DN15 | 43.5 |
| 3/4" | DN20 | 49.5 |
| 1" | DN25 | 52.5 |
| 1-1/4" | DN32 | 57.5 |
| 1-1/2" | DN40 | 61 |
| 2" | DN50 | 70 |
| 2-1/2" | DN65 | 82 |
| 3" | DN80 | 89 |
| 4" | DN100 | 98 |
| 6" | DN150 | 145 |
96 projects and 64 owners approved this product or its family through the project consultants.
and 84 more projects.
Original approval letters are provided on request with your submittal.
Threaded black steel fittings connect to black steel and black iron pipe for transporting water and gas, protecting electrical wiring, or delivering high-pressure steam and air. Uncoated black steel and iron fittings, also called black malleable iron (BMI) fittings, are made from corrosion-resistant ungalvanized steel with a scaly, dark-colored iron oxide coating. These fittings are used in piping systems to change direction or connect to equipment or devices. Threaded fittings twist onto pipe using various male and female thread connections including NPT (National Pipe Thread) or BSPT (British Standard Pipe Taper). Threaded fittings come in a variety of sizes and shapes.
We are the exclusive agent for MECH brand name of Malleable Cast Iron threaded fittings which has the UL/FM certificates.