Gibraltar 5B50B943A8Z001G Lobed Knob 5-point Black

Product Description

The GIBRALTAR 5B50B943A8Z001G is a 5-point lobed knob designed for manual adjustment and control applications across industrial, mechanical, and equipment assembly environments. Constructed from thermoplastic elastomer (TPE), the knob provides a firm, grippy feel suited for repeated hand-tightening without tools. The head diameter measures 1.91 inches, and the knob threads onto a 3/8-16 stem with a thread length of 1.5 inches. A hub diameter of 0.93 inches and overall height of 1.09 inches keep the profile compact. This part is typically installed by equipment assemblers, maintenance technicians, or mechanical contractors as a hardware component on panels, fixtures, enclosures, or adjustable assemblies.

This lobed knob is suited for use in light industrial, commercial, and equipment manufacturing settings where tool-free hand adjustment is required. The 5-lobe profile distributes grip force across multiple contact points, reducing hand fatigue during frequent adjustments. It is a direct-fit replacement or original installation component for any 3/8-16 threaded shaft or stud application requiring a compact, low-profile knob. The TPE material resists light oils and common shop-environment contaminants, making it appropriate for use on machinery controls, jigs, fixtures, and enclosure hardware.

Key Features

• 5-lobe profile for secure tool-free hand tightening
• Thermoplastic elastomer construction for firm, comfortable grip
• 1.91-inch head diameter with 0.93-inch hub diameter
• 3/8-16 thread size with 1.5-inch thread length
• Compact overall height of 1.09 inches for low-profile installations
• Lightweight at 0.12 pounds per unit

Compatibility

Designed for use on any 3/8-16 threaded shaft or stud requiring a compact lobed hand knob. Verify thread engagement depth against the 1.5-inch thread length before installation.

Installation Notes

Installation requires no special tools — thread the knob onto the 3/8-16 stud by hand until seated. Ensure the mating shaft or stud does not exceed the 1.5-inch thread length to avoid bottoming out before the knob is fully secured. De-energize or lock out any equipment before replacing hardware on active machinery per applicable safety procedures. Do not use impact tools or power drivers on thermoplastic elastomer knobs, as over-torquing can damage the hub or thread insert.