Jergens 21110 Lobed Knob 4 Point Aluminum 1-1/2 in

Product Description

The JERGENS 21110 is a four-point lobed knob machined from 319-grade aluminum, designed for hand-tightening and manual adjustment applications across industrial, mechanical, and light fabrication environments. With a 1-1/2 inch head diameter and a 3/8-16 threaded hole, it provides a firm, ergonomic grip without requiring tools. The overall height measures 7/8 inch, and the head thickness is 3/8 inch. This knob is typically installed by maintenance technicians, machinists, and assembly personnel who need reliable, repeatable hand-adjusted fastening points on fixtures, jigs, panels, or equipment enclosures.

The JERGENS 21110 suits a wide range of manual adjustment and clamping setups in industrial and commercial settings. It is well matched for use on machine tool fixtures, enclosure panels, control assemblies, and adjustable mechanical components where tool-free operation is required. The 3/8-16 thread is a common unified coarse pitch, making this knob compatible with standard threaded hardware used in general industrial assembly. It is lightweight at 0.03 pounds, making it practical for applications where added mass is a concern.

Key Features

• Four-point lobed profile provides positive grip for tool-free hand tightening
• 319-grade aluminum construction offers corrosion resistance and low weight
• 3/8-16 threaded hole with 5/8 inch thread depth accommodates standard UNC fasteners
• 1-1/2 inch head diameter and 3/8 inch head thickness suit compact mounting spaces
• 11/16 inch hub diameter and 7/8 inch overall height for low-profile installations

Compatibility

Designed as a standard-thread lobed knob for use with 3/8-16 UNC threaded studs, bolts, or threaded inserts common in industrial fixtures, enclosures, and mechanical assemblies.

Installation Notes

Installation requires only hand tightening in most applications; verify the mating stud or threaded insert is rated for the intended load before assembly. Ensure the thread engagement depth does not exceed the 5/8 inch hole depth to avoid bottoming out. No special tools or torque equipment are required for standard hand-knob service. Degrease mating threads before installation to ensure proper seating.