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The VALUE COLLECTION 31213 is a 3/8-24 UN hex nut designed for right-hand threaded fastening applications. Machined from steel with a zinc clear finish, this nut provides corrosion resistance suited to general mechanical and structural assembly work. It measures 9/16 inches across the flats and stands 21/64 inches high, conforming to standard UN thread geometry. The right-hand thread direction is the conventional installation orientation, tightening clockwise. This type of fastener is installed by mechanics, millwrights, maintenance technicians, and general tradespeople across a wide range of industrial and light mechanical applications.
This hex nut is appropriate for use in general-purpose fastening wherever a 3/8-24 UN fine-thread nut is specified. Fine-thread UN fasteners are commonly used in applications requiring greater thread engagement strength or finer torque adjustment than coarse-thread equivalents. Typical uses include mechanical assemblies, equipment maintenance, light structural connections, and repair applications across HVAC, plumbing support structures, and general industrial equipment. This nut does not meet military specifications and is intended for standard commercial applications.
Designed as a general-purpose replacement or stock hex nut for any assembly requiring a 3/8-24 UN right-hand thread steel fastener with standard hex geometry.
Install and remove using a 9/16-inch hex wrench, open-end wrench, or socket. Always ensure the mating bolt or stud matches the 3/8-24 UN thread specification before installation. Power down or de-energize any equipment before servicing fastened assemblies on mechanical or electrical systems. Do not over-torque; consult the equipment manufacturer's torque specification for the specific assembly.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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