Keystone UM005AG1F000775 Hex Nut 5/16-14 Left Hand

Product Description

The KEYSTONE THREADED PRODUCTS UM005AG1F000775 is a left-hand thread hex nut machined from 1215/12L14 free-machining steel. It is sized for 5/16-14 Acme thread applications and carries a 2G thread fit class, indicating a standard commercial tolerance suitable for general mechanical assemblies. At 0.017 pounds, this is a lightweight fastener intended for precision threaded connections where left-hand thread engagement is required to resist counter-clockwise loosening forces. Machinists, millwrights, and mechanical assembly technicians are the primary installers.

This hex nut is suited for use in industrial machinery, actuator assemblies, lead screw mechanisms, and other applications that call for Acme-profile left-hand threaded fasteners. The 5/16-14 Acme thread standard is common in linear motion systems, jigs, fixtures, and feed mechanisms. The 1215/12L14 steel grade offers good machinability and is frequently specified in precision-turned component applications. This part does not meet military specifications and is intended for commercial and industrial use.

Key Features

• Left-hand Acme thread at 5/16-14 resists counter-clockwise loosening in rotating or vibrating assemblies
• Thread fit class 2G provides standard commercial tolerance for reliable mating with compatible Acme-threaded rods or screws
• 1215/12L14 free-machining steel construction offers consistent dimensional accuracy
• 9/16-inch width across flats accepts standard hex wrenches and sockets
• Height of 19/64 inch keeps the profile compact for space-constrained assemblies

Compatibility

Designed for use with 5/16-14 Acme left-hand threaded rods, screws, or shafts in commercial and industrial mechanical assemblies requiring a 2G fit class.

Installation Notes

Installation is performed by machinists, millwrights, or mechanical assembly technicians using a standard 9/16-inch hex wrench or socket. Always de-energize and lock out any machinery before servicing threaded components in live assemblies. Verify that the mating thread is also a left-hand Acme profile before installation to avoid cross-threading or thread damage. Do not apply standard right-hand torque references to left-hand fasteners without confirming thread direction first.