3" Fig 602 Female (Threaded) x 4" NPT Swage | High-Pressure Crossover Adapter

The 3" Fig 602 Female (Threaded) x 4" National Pipe Thread (NPT) Swage is a heavy-duty, precision-engineered crossover adapter designed to provide a safe, leak-free transition from 3-inch medium-to-high pressure hammer union flowlines up to larger-capacity 4-inch threaded piping systems. This specialized fitting features a 3-inch Figure 602 Female threaded connection (designed to safely receive a standard 3" 602 male sub and wing nut) on one side, and a standard 4-inch NPT threaded connection on the opposite end.

Manufactured from a solid block of high-strength, heat-treated forged alloy steel, this integral swage is built to withstand the mechanical stresses, fluid volumes, and vibration inherent in 6,000 PSI manifold and mud systems. By providing a direct step-up transition from a 3-inch 6,000 PSI flowline to 4-inch threaded components—such as large-bore valves, mud tanks, or rigid piping spools—it eliminates the need for multiple stacked or bushed adapters, thereby reducing potential leak paths and improving overall rig-up safety.

By utilizing a seamless, integral (one-piece) forged design rather than a fabricated or welded assembly, this swage completely eliminates structural weak points. This ensures superior resistance to pressure surges and provides a reliable connection during demanding cementing, circulating, and fluid transfer operations.

Features & Benefits

• Integral Forged Construction: Machined from a single block of premium alloy steel, eliminating weld seams and providing maximum structural integrity under pressure surges and vibrations.

• Female Threaded Connection: Features a precision-machined 3" 602 female thread, ready to securely accept any standard 3" 602 male wing nut assembly for rapid field integration.

• Expanded Pipe Transition: Safely adapts a 3" hammer union connection up to a larger 4" NPT connection, ideal for routing fluids into larger-capacity secondary manifold lines, mud lines, or processing equipment.

• High-Pressure Durability: The 3" Fig 602 female end is engineered for standard 6,000 PSI Cold Working Pressure (CWP) environments. (Note: System pressure must be strictly regulated to the maximum rating of the 4" NPT threaded connection).

• Precision Machined Threads: The 4" NPT threads are cut to exacting API tolerances to ensure fast makeup, galling resistance, and a reliable leak-proof seal.

Specifications & Technical Details

Applications

This 3" Female x 4" NPT Crossover Swage is a critical utility fitting for medium-to-high pressure oilfield manifolds. It is extensively used in mud pump circulating lines, cementing manifolds, well testing packages, and production facilities for integrating large 4-inch threaded valves, secondary piping runs, and temporary flowlines safely into the primary 3-inch 602 system.

Quality Assurance

Every crossover swage undergoes rigorous quality control inspections. The alloy steel forgings are ultrasonically tested for internal flaws to guarantee structural density. Additionally, all NPT threads are strictly verified using calibrated ring and plug gauges to ensure a perfect, pressure-tight seal out in the field. The 602 female threads are verified to exact tolerances to ensure seamless integration with male components.

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