Standard GI 3/4 Inch Back Nut, BSP Threaded, Galvanized Iron

GI 3/4 Inch Back Nut

The Standard GI Back Nut provides a secure mechanical lock for threaded pipe connections in pressurized water systems and structural plumbing assemblies. This 3/4 inch fitting features a heavy-duty galvanized iron construction designed to withstand the rigors of industrial, commercial, and residential job sites. It serves as a critical component for stabilizing pipe penetrations through tanks and bulkheads.

Built for the Job

Plumbers and facility managers rely on this galvanized hardware for installations where a fitting must be locked firmly against a flat surface or another fitting. In water storage applications, the nut secures the internal side of a tank connector to prevent leaks caused by movement or vibration. The iron substrate offers high tensile strength, ensuring the threads do not strip under the high torque required for a watertight seal. This component is essential for maintaining the integrity of 20mm (3/4″) galvanized pipe networks, especially in outdoor environments where exposure to the elements is constant.

• Securing bulkhead fittings in plastic or metal water storage tanks.

• Locking valves and taps into position on threaded pipe ends.

• Reinforcing structural pipe frames and handrail assemblies.

Product Highlights

Corrosion Resistance

The hot-dip galvanized coating protects the underlying iron from oxidation, rust, and mineral buildup in hard water conditions.

Precision Threading

• Standard 3/4 inch BSP (British Standard Pipe) female threads.
• Consistent thread depth for maximum engagement with male pipe ends.

Technical Specifications

What’s Included

• 1 x 3/4 Inch Galvanized Iron Back Nut

On-Site & Workshop Notes

• Always use PTFE tape or a suitable pipe jointing compound on the mating threads to ensure a leak-proof connection.

• Use a standard adjustable wrench or pipe spanner on the hexagonal flats to avoid marring the galvanized finish.

• Store in a dry area to prevent white rust formation before installation on the site.

• Check that the female threads are clear of debris or excess zinc before hand-tightening onto the pipe.