Gibraltar 5B50B923A8Z002G Lobed Knob 5-point 1/4-20

Product Description

The GIBRALTAR 5B50B923A8Z002G is a five-point lobed knob designed for manual adjustment and control applications across industrial, HVAC, and mechanical equipment. Molded from thermoplastic elastomer, the knob provides a firm, comfortable grip without tools. It features a 1/4-20 threaded stem with 1 inch of thread engagement, making it a direct-install fastening component on panels, enclosures, and equipment housings. The 1.91-inch head diameter gives technicians adequate leverage for hand-tightening on access covers, adjustment shafts, and calibration controls. The black finish is standard for control hardware in mechanical and electrical service environments.

This lobed knob is suited for use on HVAC equipment panels, electrical enclosures, pump housings, filter housings, and general mechanical assemblies where a hand-operable fastener is required. It is commonly installed by HVAC technicians, electricians, and mechanical service professionals during equipment assembly, panel modification, or field replacement of worn or broken control knobs. The thermoplastic elastomer construction holds up in environments with moderate temperature variation and occasional exposure to shop fluids.

Key Features

• Five-point lobed profile for secure hand grip without additional tools
• Thermoplastic elastomer construction for durability and tactile comfort
• 1/4-20 threaded stem with 1 inch of thread length for standard panel and shaft fitment
• 1.91-inch head diameter provides sufficient torque leverage for hand-tightening
• 0.93-inch hub diameter and 0.17-inch hub height for low-profile panel mounting
• Overall height of 1.09 inches keeps the knob compact on crowded control panels

Compatibility

Designed as a standard hand-knob replacement for any 1/4-20 threaded shaft or insert application on mechanical equipment, HVAC panels, or electrical enclosures requiring a five-point lobed control knob.

Installation Notes

Installation requires no special tools — thread the knob onto a 1/4-20 male stud or insert and hand-tighten to the appropriate clamping force for the application. Before servicing any live panel or enclosure, de-energize and lock out the equipment per applicable NFPA 70E or facility safety procedures. Do not use impact tools or wrenches on the knob body, as overtightening can crack the hub or strip the threaded insert. Verify thread engagement depth does not exceed the 1-inch thread length to avoid bottoming out on blind inserts.