Keystone Threaded Products UM020AG1F003040 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM020AG1F003040 is a heavy-duty hex nut machined from 1215/12L14 free-machining steel, designed for use with 1-1/4-4 Acme-threaded rod or lead screws. This nut features a left-hand thread configuration and a 2G thread fit class, making it well-suited for applications where standard right-hand fasteners are not appropriate. At 2 inches across the flats and 1-7/32 inches in height, it provides a solid bearing surface for high-load assemblies. Licensed tradespeople and maintenance machinists install this type of fastener in linear motion systems, machine tool components, and industrial mechanical assemblies where precise Acme thread engagement is required.

This hex nut is used in mechanical and industrial trade applications requiring left-hand Acme threading. Typical scenarios include linear actuators, jack screws, and positioning mechanisms where reverse-thread engagement prevents unintended loosening under load. The 1215/12L14 steel grade offers good machinability and is commonly selected for precision machined fastener components. This part is sold individually and is appropriate for both new builds and replacement in existing left-hand Acme thread assemblies.

Key Features

• Left-hand thread direction for applications requiring reverse-thread fastening
• Acme thread form, 1-1/4-4 thread size, with 2G fit class for standard mechanical clearance
• 1215/12L14 free-machining steel construction for consistent dimensional accuracy
• 2 inches across flats for use with standard hex tooling
• 1-7/32 inches height provides full thread engagement depth
• Does not meet military specifications - for commercial and industrial use

Compatibility

Designed for use with 1-1/4-4 left-hand Acme threaded rod, lead screws, or mating fasteners conforming to Acme thread standards with a 2G fit class.

Installation Notes

Installation is performed by machinists or mechanical maintenance technicians familiar with Acme thread systems. Always confirm left-hand thread direction before installation, as these nuts will not engage correctly on standard right-hand threaded rod. Use appropriate hex tooling sized for a 2-inch across-flats hex profile. Ensure mating threaded components are clean, free of burrs, and properly aligned before torquing to assembly specifications.