Jergens 21904 Revolving Handwheel Machine Handle 3/8-16

Product Description

The JERGENS 21904 is a revolving handwheel machine handle designed for manual positioning and adjustment tasks on industrial machinery and equipment. The handle features an aluminum cylindrical grip measuring 1 inch in diameter and 2.5 inches in length, mounted on a carbon steel threaded stem sized at 3/8-16 UNC. The stem extends 0.5 inches for secure engagement with mating threaded bores. Weighing just 0.19 pounds, this compact handle is built for repeated use in production, machine tool, and fixture applications where quick manual control is required.

This revolving handle suits light to medium-duty manual adjustment applications found in machine shops, manufacturing floors, and maintenance environments. The revolving grip style allows the operator to spin the handle freely while keeping the stem stationary, reducing hand fatigue during repetitive adjustments. It is a standard hardware component installed by machinists, millwrights, and maintenance technicians on machine tools, jigs, fixtures, and adjustable work-holding equipment.

Key Features

• Revolving cylindrical grip reduces hand fatigue during repetitive manual operation
• Aluminum handle body offers a lightweight, corrosion-resistant grip surface
• Carbon steel threaded stem provides strong, reliable engagement with machine threads
• 3/8-16 UNC thread size fits a wide range of standard machine tool and fixture applications
• 1-inch handle diameter and 2.5-inch handle length suit compact installation spaces
• Low overall weight of 0.19 pounds minimizes added load to adjustable assemblies

Compatibility

Designed as an OEM-style replacement or standard hardware component for machinery, fixtures, and equipment accepting a 3/8-16 UNC threaded stem revolving handle mount.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using standard hand tools. Thread the stem into the mating bore by hand first to confirm proper thread engagement before applying tool torque. Ensure the mating bore is clean and free of debris before installation. Power down and de-energize any associated equipment before servicing or replacing machine handles on active machinery.