Keystone Threaded Products UM018AG1A002845 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM018AG1A002845 is a steel hex nut with a 1-1/8-5 Acme thread profile and a right-hand thread direction. It carries a 2G fit class, indicating a general-purpose Acme thread tolerance suitable for power transmission and linear motion applications. The nut measures 1-13/16 inches (1.8125 inches decimal) across the flats and stands 1-7/64 inches tall. At 0.63 pounds, it is a substantial fastener suited for heavy mechanical assemblies. Machinists, millwrights, and maintenance technicians working with lead screws, jack screws, or linear actuator systems are the primary installers of this component.

This hex nut is designed for use in industrial and mechanical assemblies where Acme-thread fasteners are specified. Common applications include jack screws, vises, press frames, linear actuators, and other power-screw mechanisms that require controlled axial movement under load. The right-hand thread direction is standard for the vast majority of these assemblies. The 2G fit class provides adequate clearance for smooth engagement while maintaining acceptable backlash control in general-purpose power-screw applications.

Key Features

• Acme thread form with 1-1/8-5 thread size for power transmission duty
• Right-hand thread direction for standard mechanical assembly orientation
• 2G thread fit class providing general-purpose Acme thread tolerance
• 1-13/16 inch width across flats for use with standard heavy hex tooling
• Steel construction for strength and durability in industrial environments
• Does not meet military specifications - commercial grade

Compatibility

Designed as a replacement or stock hex nut for assemblies specifying a 1-1/8-5 Acme right-hand thread with a 2G fit class tolerance.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using an open-end or box-end wrench sized for a 1-13/16 inch across-flats dimension. Ensure mating lead screw or threaded rod also carries a compatible 1-1/8-5 Acme 2G thread profile before installation. Disengage and de-energize any associated drive or load mechanism before servicing the threaded assembly. Do not use impact tooling on Acme-thread nuts, as it can damage the thread form and degrade fit class tolerances.