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Introducing Lovejoy's rigid coupling hub - designed for superior durability and strength in demanding industrial environments. Featuring a robust construction from carbon steel, this coupling hub offers unbeatable resistance to wear, corrosion, and harsh conditions. The versatile 1-3/8 inside diameter and 3-3/4 outside diameter make it ideal for use with various pipe sizes and applications. Moreover, the innovative 5/16 keyway width and 5/32 depth provide a secure connection that prevents leaks and ensures equipment stability. Save time and money on maintenance with Lovejoy's rigid coupling hub - the ultimate solution for securing your machinery and pipes!