304 Stainless Steel Casting Coupling Class 150 Threaded NPT
Product Specifications
| Attribute | Value |
|---|
| Product Name | Threaded Coupling |
| Material | 304 Stainless Steel / Casting Grade CF8 |
| Standard | ASTM A351 (Material) / ISO 4144 (Dimensions) |
| Fitting Type | Equal Coupling, Casting |
| Connection | Threaded NPT |
| Pressure Rating | Class 150 |
| Application | General Plumbing, Low-Pressure Piping |
| Size | Available in various sizes |
Key Features
- Material: 304 Stainless Steel (CF8 casting grade)
- Threaded NPT connection for easy installation
- Class 150 pressure rating
- Equal coupling design for same-diameter connections
- ISO 4144 standard compliant dimensions
- Suitable for low-pressure plumbing and industrial applications
NPT Threaded Connection
This coupling features NPT (American standard pipe taper thread)
with a 60° tooth angle and 1:16 thread taper, creating an effective
mechanical seal when tightened. The connection requires no welding,
offering convenient installation and disassembly. This widely used
connection method is common in industrial and commercial piping
systems throughout North America and globally.
Material Properties
304 stainless steel (cast as CF8) offers excellent corrosion
resistance in water, air, and weakly corrosive environments. Its
combination of mechanical properties and workability makes it ideal
for manufacturing low-pressure pipe fittings in water supply,
drainage, and general chemical applications.
Applications
Class 150 cast couplings are fundamental components for connecting
straight pipe sections in low-pressure systems. They are widely
used in:
- Commercial and residential water systems
- Drainage and fire protection pipelines
- Industrial utilities (compressed air, water lines)
- General plumbing connections
About SMLSCO
Founded in 2006, SMLSCO is a global leader in stainless steel
piping solutions, offering comprehensive procurement services
including pipes, flanges, and fittings. Our strengths in inventory,
delivery speed, and competitive pricing make us a reliable partner
for streamlining your supply chain.
Complete Product Line
SMLSCO offers a full range of cast stainless steel fittings for
medium and low pressure applications, including elbows, tees,
unions, plugs, caps, and nipples - providing complete,
cost-effective solutions for your piping projects.
FAQ
Q1: What are the differences between casting and forged pipe
couplings in terms of usage?
A1: Casting pipe couplings are designed for low-pressure systems
such as plumbing and low-pressure gas, offering excellent
cost-effectiveness. Forged pipe couplings are typically used in
high-pressure applications.
Q2: Do I need to use sealing material when installing this NPT
threaded pipe coupling?
A2: Yes. NPT is a tapered pipe thread, and although it has
mechanical sealing capabilities, to ensure 100% leak-proof
performance and prevent galling of stainless steel threads, PTFE
tape or a professional pipe thread sealant must be used during
installation.
Q3: Can this 304 pipe coupling be used to connect carbon steel
pipes?
A3: Physically, it is possible (as long as the threads are both
NPT), but we do not recommend long-term mixed use. Contact between
stainless steel and carbon steel in a humid environment can easily
cause "galvanic corrosion," leading to accelerated rusting at the
connection point. We recommend using it with SMLSCO's stainless
steel nipples.
