Keystone Threaded Products UM008AG1F001265 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM008AG1F001265 is a left-hand-thread hex nut designed for Acme threaded assemblies. It is manufactured from 1215/12L14 leaded free-machining steel, offering consistent machinability and reliable thread engagement under load. The nut carries a 2G thread fit class on a 1/2-10 Acme thread profile, making it suitable for linear-motion and power-transmission applications where left-hand thread orientation is required. With a width across flats of 7/8 inches and a height of approximately 31/64 inches, it mates with standard hex tooling. Machinists, millwrights, and maintenance technicians working on jacks, lead screws, and actuator assemblies are the primary installers of this fastener.

This hex nut is used in industrial and mechanical assemblies that require left-hand Acme thread engagement to prevent back-driving or to match existing left-hand threaded rod and lead screw configurations. Typical applications include machine tool lead screws, linear actuators, vises, and lifting jacks where a 1/2-10 Acme thread form is specified. It is not intended for standard unified or metric fastener applications. The 1215/12L14 steel grade is suited for moderate-load, non-corrosive environments and is commonly found in light industrial and OEM fabrication settings.

Key Features

• Left-hand Acme thread orientation prevents accidental loosening in back-driving assemblies
• 1/2-10 Acme thread profile matches standard lead screw and jack shaft configurations
• 2G thread fit class provides a standard clearance fit for reliable mating
• 1215/12L14 free-machining steel enables precise thread form and consistent tolerances
• 7/8-inch width across flats accepts standard hex wrenches and sockets
• Compact 31/64-inch height suits space-constrained assemblies

Compatibility

Designed for use with 1/2-10 Acme left-hand threaded rod, lead screws, and actuator shafts requiring a 2G thread fit class in light industrial or OEM mechanical assemblies.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians familiar with Acme thread systems. Confirm left-hand thread direction before assembly - left-hand nuts tighten counterclockwise. Use a calibrated torque wrench and appropriate hex socket; avoid impact tools that may gall the 12L14 steel thread form. Inspect mating threads for wear or contamination before installation to ensure proper 2G fit engagement.