Keystone Threaded Products UM016AG1F002540 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM016AG1F002540 is a heavy hex nut machined from 1215 and 12L14 free-machining steel. It carries a left-hand Acme thread at 1-4 thread size with a 2G fit class, making it suited for lead screws, jack screws, and linear-motion assemblies that require reverse-thread engagement to resist loosening under directional load. The nut measures 1-5/8 inches across flats and 63/64 inch in height. It weighs 0.425 pounds. Maintenance mechanics, millwrights, and industrial technicians install this part in power-transmission and positioning equipment.

This hex nut is intended for use in mechanical assemblies where an Acme left-hand thread is specified - commonly found in vises, presses, lifting fixtures, and machine tool feed mechanisms. The 2G thread fit class provides a standard commercial tolerance appropriate for most general-purpose Acme applications. The 1215 and 12L14 steel grades offer good machinability and are commonly used in precision-turned fastener components. This nut does not meet military fastener specifications and should not be substituted in mil-spec assemblies.

Key Features

• Left-hand Acme thread engages reverse-thread lead screws and anti-back-drive assemblies
• 1215 and 12L14 free-machining steel for consistent dimensional accuracy
• 2G fit class delivers standard commercial Acme thread tolerance
• 1-5/8 inch width across flats accepts standard hex wrench and socket tooling
• 63/64 inch height provides adequate thread engagement depth for the 1-4 thread size
• Does not meet military specifications - suitable for commercial and industrial use

Compatibility

Designed for use with 1-4 left-hand Acme threaded rods, lead screws, and spindles requiring a 2G fit class in commercial industrial and mechanical power-transmission applications.

Installation Notes

Installation is typically performed by millwrights or maintenance mechanics using standard hex sockets or open-end wrenches. Confirm left-hand thread engagement before applying torque - the nut tightens by turning counterclockwise relative to the mating screw. De-energize and lock out all power sources before replacing any nut in a moving assembly. Do not substitute this nut in safety-critical or mil-spec fastener applications.