Keystone Threaded Products UM024AG1F003840 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM024AG1F003840 is a heavy-duty hex nut designed for Acme-threaded rod and screw assemblies requiring left-hand thread engagement. Manufactured from 1215 and 12L14 leaded free-machining steel, this nut offers reliable thread fit in mechanical and industrial power-transmission applications. The left-hand thread direction is a critical specification: it is used specifically in assemblies where counter-rotation or differential loading would cause a standard right-hand nut to back off over time. Thread size is 1-1/2-4 Acme with a 2G fit class, indicating a general-purpose, moderate-tolerance class suitable for most power-screw and lead-screw applications.

This hex nut is suited for use in linear motion assemblies, power-screw mechanisms, and machine-tool or conveyor applications where Acme-thread left-hand configurations are specified. Maintenance machinists, millwrights, and industrial contractors typically source this fastener for equipment overhaul or custom fabrication work. The 1215 and 12L14 steel grades machine cleanly, making field trimming or re-facing practical when exact stack height matters. The part ships as a single-piece unit, appropriate for low-volume maintenance or engineering sample use.

Key Features

• Left-hand Acme thread prevents back-off in counter-rotation drive assemblies
• 1-1/2-4 thread size with 2G fit class for general-purpose power-screw applications
• 1215 and 12L14 free-machining steel for clean thread engagement and machinability
• 2-3/8 inches across flats accommodates standard heavy hex tooling
• 1-1/2 inch height provides adequate thread engagement depth for Acme-threaded rod
• Does not meet military specifications - standard commercial-grade fastener

Compatibility

Designed for use with 1-1/2-4 Acme left-hand threaded rod or screw stock in commercial and industrial mechanical assemblies. Verify thread direction and fit class against the mating component before installation.

Installation Notes

Installation should be performed by a qualified millwright, machinist, or maintenance technician familiar with Acme-thread fastener systems. De-energize and lock out all mechanical drive systems before removing or installing power-screw hardware. A standard open-end or box wrench sized for 2-3/8 inches across flats is required for proper torque application. Because this nut uses a left-hand thread, it tightens counterclockwise and loosens clockwise - confirm thread direction before installation to avoid cross-threading.