Value Collection 250678 Reducing Coupling Nut 3/8-16 X 1/2-13

Product Description

The VALUE COLLECTION 250678 is a reducing coupling nut designed to join two externally threaded fasteners of different thread sizes. One end accepts a 3/8-16 thread and the other accepts a 1/2-13 UNC thread, making it a standard reducing style rather than a same-size coupling. The overall length is 1-1/4 inches and the width across flats is 5/8 inches, allowing engagement with a standard open-end or box wrench. Manufactured from Grade 2 steel with a zinc-plated finish for basic corrosion resistance, this coupling nut is suited for light to medium fastening applications in mechanical assemblies, HVAC mounting structures, and general trade work.

This coupling nut is commonly used when a threaded rod or stud of one diameter must be connected to a bolt or rod of a different thread size. Typical applications include equipment mounting, unistrut and support-structure builds, and other assemblies where thread transition between 3/8-16 and 1/2-13 UNC is required. It is installed by hand-start followed by wrench tightening. Right-hand thread direction applies to both ends, consistent with standard UNC fastener practice.

Key Features

• Reduces between 3/8-16 and 1/2-13 UNC threads in a single coupling nut
• 1-1/4 inch overall length provides adequate thread engagement on both ends
• 5/8 inch width across flats fits standard open-end and box wrenches
• Grade 2 steel construction for general-purpose fastening loads
• Zinc-plated finish provides basic corrosion protection in dry or mildly humid environments
• Right-hand thread direction on both ends matches standard UNC fastener orientation

Compatibility

Designed as a standard reducing coupling nut for use with 3/8-16 and 1/2-13 UNC threaded rods, studs, and bolts in general mechanical and trade fastening assemblies.

Installation Notes

Installation is performed by hand-starting both threaded connections before applying final torque with an open-end or box wrench sized to 5/8 inches across flats. Verify thread engagement depth on both ends before fully tightening. Do not use this coupling nut in high-vibration or structural load-bearing applications without confirming Grade 2 steel is appropriate for the load requirements. Follow applicable mechanical codes for the trade and application type.