Keystone Threaded Products UM016AG1F002545 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM016AG1F002545 is a left-hand thread hex nut machined from steel for use in mechanical assemblies that require reverse-thread fastening. It features a 1-5 inch Acme thread form with a 2G fit class, providing controlled thread engagement suited to power transmission and motion control applications. The width across flats measures 1.625 inches and the height is approximately 63/64 inches, fitting standard hex tooling of that size. This nut is installed by licensed millwrights, maintenance technicians, and mechanical contractors working on linear actuators, lead screws, jacks, and similar Acme-threaded drive systems.

Left-hand Acme thread nuts are specified when a standard right-hand nut would loosen under the direction of rotation of the drive mechanism, or when a paired left-right assembly is required for balanced thrust loading. The 2G fit class indicates a general-purpose commercial tolerance appropriate for typical power screw applications. At 0.5625 pounds per unit, this nut is suitable for light-to-medium industrial and trade applications where steel construction provides adequate strength and wear resistance.

Key Features

• Left-hand Acme thread direction prevents loosening in counter-clockwise drive applications
• Thread size 1-5 inch with 2G fit class for general-purpose commercial tolerance
• Width across flats of 1.625 inches fits standard hex wrench and socket tooling
• Steel construction provides durability for power transmission environments
• Height of 63/64 inches suits standard nut seating depths on Acme lead screws

Compatibility

Designed as an OEM-style replacement or service nut for mechanical assemblies using 1-5 inch left-hand Acme threaded rod or lead screws with a 2G fit class standard.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with Acme thread fastener systems. Disengage and lock out any powered drive system before removing or installing nuts on active lead screws. Verify thread direction before threading the nut onto the mating screw to avoid cross-threading. Use a correctly sized hex wrench or socket matching the 1.625-inch across-flats dimension to achieve proper seating without damage to the nut flats.