Value Collection MPA996267 Left Hand Hex Jam Nut 3/8-24 Unf

Product Description

The VALUE COLLECTION MPA996267 is a 3/8-24 UNF left hand hex jam nut designed for fastening applications that require reverse-thread engagement. Machined from steel with a zinc clear finish, this low-profile nut measures 9/16 inches across flats and 0.2188 inches in height. Its left hand thread direction makes it the correct choice for rotating assemblies, counterclockwise-loaded joints, and setups where a standard right hand nut would loosen under normal operational forces. Licensed tradespeople in HVAC, plumbing, electrical, and mechanical service will encounter this fastener wherever anti-loosening or paired left-right thread configurations are required.

This jam nut is suited for light-duty fastening tasks in residential and commercial trade applications. Its compact profile allows it to act as a locking nut when tightened against a primary nut, effectively jamming the two together to resist vibration-induced loosening. The 3/8-24 UNF thread is a fine-pitch unified national fine specification, common in precision mechanical assemblies, equipment frames, and control linkages where fine thread engagement and holding strength matter.

Key Features

• Left hand thread direction for reverse-threaded and anti-loosening applications
• 3/8-24 UNF fine-pitch thread for precise engagement and strong hold
• 9/16 inch across-flats hex profile fits standard open-end and combination wrenches
• Low-profile jam nut design at 0.2188 inches high for tight clearance installations
• Steel construction with zinc clear finish for corrosion resistance in light-duty environments
• Sold in a package of 10, suitable for single-job or small-stock use

Compatibility

Designed for use with any 3/8-24 UNF left hand threaded rod, bolt, or stud in mechanical assemblies requiring a reverse-thread jam nut.

Installation Notes

Installation is performed by hand-threading the nut onto a left hand threaded fastener in the counterclockwise direction before tightening with an open-end or combination wrench sized for 9/16 inches across flats. When used as a jam nut, run a second nut against this one and tighten both in opposing directions to lock the assembly. Always confirm thread direction before installation to avoid cross-threading. Follow applicable mechanical codes and equipment manufacturer guidelines when selecting fasteners for structural or safety-critical joints.