Keystone Threaded Products UM012AG1F001850 Hex Nut

Product Description

The KEYSTONE THREADED PRODUCTS UM012AG1F001850 is a left-hand threaded hex nut machined from steel for use in Acme-thread assemblies. It carries a 3/4-6 Acme thread specification with a 2G fit class, meaning it delivers a standard commercial-grade clearance suitable for power-transmission and linear-motion applications. The nut measures 1.25 inches across flats and stands 47/64 inches tall. Left-hand thread orientation prevents loosening in applications where rotation direction would otherwise back off a standard right-hand fastener. Machinists, millwrights, and maintenance technicians working on lead screws, vises, jacks, and similar mechanical assemblies specify this type of fastener.

This nut is suited for industrial and commercial mechanical assemblies that rely on Acme-profile lead screws. Typical installations include manual and powered linear actuators, machine tool components, valve stems, and lifting equipment where a left-hand thread is required to counteract operational torque or to pair with a left-hand lead screw. It is not intended for standard fastener or structural bolting applications. Installers should confirm thread direction and fit class against the mating screw before assembly.

Key Features

• Left-hand Acme thread prevents self-loosening in counter-rotating assemblies
• 3/4-6 thread size with 2G fit class for standard commercial clearance
• Steel construction provides strength and durability in mechanical drive applications
• 1.25 inches across flats accepts standard hex wrenching tools
• 47/64 inches height suits compact nut-pocket and flange designs
• UNSPSC Code 31161727 for procurement classification

Compatibility

Designed as a replacement or service nut for mechanical assemblies using 3/4-6 left-hand Acme threaded lead screws with a 2G fit class. Confirm thread direction, pitch, and fit class against the mating component before installation.

Installation Notes

Installation should be performed by a qualified machinist or millwright familiar with Acme-thread assemblies. Disengage and lock out all power sources before removing or replacing any threaded fastener in a live mechanical drive system. Do not force the nut onto the mating screw; hand-start threads to confirm proper engagement before applying torque. Inspect the mating lead screw for wear or damage before installing a new nut.