Premium Black Malleable Iron Part-Threaded Socket (ASME B16.3 and ASTM A197 Compliant)
Engineered specifically for heavy-duty natural gas, LP (liquid propane), and mechanical piping networks, our Premium Black Malleable Iron Part-Threaded Sockets provide a reliable, high-strength solution for custom connections. Often utilized as a weld-on half coupling or a specialized transition sleeve, this fitting features internal threading on a portion of its inner bore, allowing for clean mechanical integration without extending unthreaded pipe profiles.
Manufactured from high-strength cupola malleable iron, this fitting features a precision-machined internal National Pipe Taper (NPT) thread profile on its finished side. This ensures an exceptionally tight mechanical wedge fit when paired with standard schedule 40 black steel pipes or equipment ports, delivering complete structural integrity under constant load stress.
Key Features and Benefits
Heavy-Duty Malleable Iron Construction: Cast from premium ASTM A197 cupola malleable iron, delivering excellent tensile strength and fatigue resistance. It will not crack or fracture under heavy pipe wrench installation torque.
Part-Threaded Internal Sleeve Profile: Designed with threading that spans only a specific portion of the internal bore, allowing it to function flawlessly as an equipment port tap, tank adapter connection, or a short-clearance weld sleeve.
Precision-Tapered NPT Threads: CNC-machined to strict ASME B1.20.1 standards. The smooth, deep-cut internal threads allow thread sealants to distribute uniformly, creating a gas-tight seal that completely eliminates bypass leaks.
Naturally Finished Black Coating: Treated with a raw black oxide finish and a light factory oil coat to provide dependable storage protection against atmospheric humidity and oxidation before job-site installation.
Industry Code and Safety Compliant: Meets all dimensional metrics of ASME B16.3 and carries UL Listing and FM Approval, ensuring it fully satisfies strict local municipal mechanical and gas plumbing building codes.
Technical Specifications
Fitting Profile: Part-Threaded Socket / Half Coupling Sleeve
Material Standard: ASTM A197 / A197M Cupola Malleable Iron Castings
Dimensional Standard: ASME B16.3 Class 150 Malleable Iron Threaded Fittings
Thread Specification: ANSI / ASME B1.20.1 National Pipe Taper Threads (Partial Depth)
Pressure and Temperature Ratings: Rated for up to 300 PSI at 150 degrees Fahrenheit, or 150 PSI at 300 degrees Fahrenheit
Fluid Compatibility: Natural gas, liquid petroleum (LP) gas, compressed air, oils, and non-potable closed systems (Note: Not for use in domestic potable water lines due to rust risks).
Ideal Applications
Welding onto Vessels, Header Manifolds, or Larger Pipe Walls to Create a Threaded Branch Port
Fabricating Low-Profile Structural Extensions in Commercial Gas Infrastructure Loops
Establishing Low-Clearance Instrument or Gauge Taps in Industrial Mechanical Rooms
Connecting Gas Supply Distribution Rails to Custom Production Appliances and Machinery
