Thread Chart (UNF-UNC) - Major and Minor Diameters

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Thread Sizes Standards

Fastener Thread Standards and Definitions

What’s the Difference between 4 Screw Thread Types?

Mitutoyo 326-351-30 Digimatic Anvil Screw Thread Micrometers SPC Data Output 0-25mm (0-1") - DML

Lockdown Screw (LDS) Lockdown screws, (LDS) utilize an external thread (ET) design that moves the threads outside the pressurized or wetted surface of the wellhead equipment. They utilize a robust Unified National Coarse (UNC) thread for the lockdown screw itself and the packing gland nut to minimize any galling. Additionally a one piece HBNR compression packing element with molded metal end caps to provide a dependable seal in multiple pressure ranges and service environments. 🔹They mechanical