Midland Industries 64703 Hex Locknut 1/2 in Galvanized Iron

Product Description

The MIDLAND INDUSTRIES 64703 is a 1/2-inch galvanized malleable iron hex locknut designed to secure threaded pipe fittings and prevent loosening under pressure or vibration. It carries a 150 psi pressure rating and is rated for temperatures from -20 degrees F to 350 degrees F, making it suitable for a wide range of piping applications. The female straight connection and 1/2-14 thread make this a standard-class fitting for gas, water, and steam distribution systems. Licensed plumbers, pipefitters, and HVAC technicians commonly use locknuts like this one to lock bushings, nipples, or other fittings securely within threaded assemblies.

This fitting is used in residential and light commercial piping installations where a 150-pound class galvanized malleable iron fitting is required. Typical applications include natural gas distribution, compressed air lines, and water supply piping. The galvanized finish provides corrosion resistance for both indoor and outdoor environments. At 0.06 pounds and a compact profile, it is well-suited for tight or confined installations where standard hex tooling must be used.

Key Features

• Galvanized malleable iron construction for corrosion resistance and durability
• 150 psi pressure rating for standard service applications
• Operating temperature range of -20 degrees F to 350 degrees F
• 1/2-14 female straight thread for reliable pipe engagement
• Hex profile allows standard wrench installation
• 0.31-inch thickness provides solid locking contact against mating fittings

Compatibility

Designed as an OEM-style 150-pound class galvanized malleable iron locknut for use with standard 1/2-inch NPT threaded pipe fittings in gas, water, and compressed air piping systems.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including the IPC and IFGC where relevant. Shut off and depressurize the supply line fully before removing or replacing any threaded fitting. Use a properly sized open-end or adjustable wrench on the hex profile - pipe wrenches can deform the fitting. Apply thread sealant or tape appropriate for the service medium before final tightening.