4" 2,000 PSI Fig 206 Male Blind Sub with Wing Nut – Oil & Gas Hammer Union

The 4" Figure 206 Male Blind Sub with Wing Nut is a comprehensive, large-bore closure assembly designed to securely cap off and isolate female threaded hubs in medium-pressure hammer union systems. Rated for a Cold Working Pressure (CWP) of 2,000 PSI, the Figure 206 series is a staple in high-volume water transfer, drilling mud systems, and general oilfield utility lines where a dependable, leak-proof seal is essential.

Manufactured from high-strength forged steel, this complete assembly includes the precision-machined male blind sub and the heavy-duty Figure 206 wing nut. A key advantage of the Figure 206 design is the integrated O-ring groove located on the male sub, which provides a secondary elastomeric seal. This ensures a bubble-tight, blowout-proof connection that resists leakage even in 4-inch lines subjected to heavy vibration or slight piping misalignment. Because it arrives fully assembled with the wing nut, rig personnel can immediately deploy the blind to terminate flowlines using standard hammer-up techniques, saving valuable operational time.

Built to withstand the severe mechanical rigors of the oilfield, the 4" 206 Male Blind Sub with Wing Nut ensures maximum safety and simplified manifold management in standard-duty applications.

Features & Benefits

• Complete Assembly: Arrives fully equipped with the male blind sub and heavy-duty wing nut for immediate, drop-in field use without additional parts sourcing.

• 2,000 PSI CWP Rating: Specifically engineered for reliable pressure containment in high-volume utility, mud, and water transfer environments.

• O-Ring Sealing Technology: Features an integrated O-ring groove on the male sub for superior leak prevention compared to standard metal-to-metal seals.

• Forged Steel Construction: Delivers exceptional structural integrity and impact resistance to endure repeated make-and-break cycles.

• Positive Isolation: Provides a secure and immediate dead-end for 4-inch flowlines, protecting personnel and preventing fluid loss.

• Rapid Installation: The classic hammer union design allows for quick and secure connections using a standard sledgehammer, minimizing rig-up time.

Specifications & Technical Details

Applications

This 4" Figure 206 male blind sub with wing nut is essential for large-bore, medium-pressure operations requiring frequent and secure flowline termination. Typical uses include capping off unused female ports on water transfer manifolds, isolating mud lines on drilling rigs, dead-ending production gathering systems, and securing temporary high-volume flowlines.

Quality Assurance

Each blind assembly is manufactured under strict quality control protocols. All components undergo precise dimensional inspection—particularly the O-ring groove and thread engagement—to ensure absolute interchangeability with standard 4" Fig 206 hammer unions and reliable blowout-proof performance under rated field pressures.

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