4" 2,000 PSI Fig 206 Threaded Female Blind Sub – Oil & Gas Hammer Union

The 4" Figure 206 Threaded Female Blind Sub is a large-bore, medium-pressure closure fitting designed to safely cap off and isolate the male end of a hammer union connection. Rated for a Cold Working Pressure (CWP) of 2,000 PSI, the Figure 206 series is widely utilized in high-volume water transfer, mud systems, and general utility services where robust fluid containment is required.

Manufactured from high-strength forged steel, this female blind sub features precision-machined external Acme threads characteristic of the Figure 206 union. It is engineered to mate perfectly with a standard 4" Fig 206 male sub. Because the Figure 206 design incorporates a secondary O-ring on the male half, this female hub provides the smooth, precisely machined seating surface necessary to compress that O-ring, ensuring a bubble-tight, leak-proof seal even under heavy vibration or slight piping misalignment.

Built for durability and ease of use in the field, the 4" 206 Female Blind provides a safe, blowout-proof termination point, allowing operators to rapidly isolate sections of a manifold or flowline for maintenance without depressurizing the entire system.

Features & Benefits

• 2,000 PSI CWP Rating: Ideal for large-volume, standard-pressure applications including water transfer, mud suction/discharge, and utility lines.

• Forged Steel Construction: Provides exceptional impact resistance and structural durability for long-term field service.

• Precision Acme Threads: Machined to industry standards to ensure smooth engagement and high-torque reliability with the mating 4-inch wing nut.

• O-Ring Seating Surface: Engineered with a flawless internal face to mate perfectly with O-ring equipped male subs for superior sealing.

• Positive Isolation: Offers a safe, immediate, and blowout-proof dead-end for large 4-inch flowlines and manifold branches.

• Rapid Installation: The hammer union design allows for quick make-up and break-out using a standard sledgehammer, minimizing operational downtime.

Specifications & Technical Details

Applications

This 4" Figure 206 threaded female blind sub is primarily used in large-bore, medium-pressure environments requiring frequent connection and disconnection. Typical applications include capping off water transfer manifolds, isolating mud tank lines on drilling rigs, dead-ending production gathering lines, and terminating temporary high-volume flowlines in utility services.

Quality Assurance

Each female blind sub is manufactured under stringent quality control protocols. All components undergo precise thread gauging and dimensional inspection to ensure absolute interchangeability with standard 4" Fig 206 hammer unions and reliable blowout-proof performance under rated field pressures.

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