Gibraltar 5B40B921A8Z002G Lobed Knob 5-point Black

Product Description

The GIBRALTAR 5B40B921A8Z002G is a 5-point lobed knob made from thermoplastic elastomer (TPE) in a black finish. It is designed for manual fastening and adjustment applications where a tool-free grip is needed. The knob features a 1.52-inch head diameter and accepts a 1/4-20 threaded stem with a 0.50-inch thread length. TPE construction provides a firm, comfortable grip and resistance to moderate industrial use. This type of knob is commonly installed by HVAC technicians, electricians, plumbers, and equipment maintenance professionals on panels, enclosures, and mechanical assemblies.

This lobed knob is suited for use on control panels, access covers, equipment enclosures, and light-duty mechanical assemblies across residential and light commercial trade applications. The 5-lobe profile allows finger-tightening without tools, making it practical for service panels and components that require regular access. The 1/4-20 thread size is a standard fastener size found across a wide range of equipment in HVAC, electrical, and plumbing trades.

Key Features

• 5-point lobed profile allows tool-free finger tightening and loosening
• Thermoplastic elastomer construction provides a secure, comfortable grip
• 1.52-inch head diameter with a 0.69-inch hub diameter
• Standard 1/4-20 threaded stem with 0.50-inch thread length
• Overall height of 1.09 inches with a hub height of 0.18 inches
• Black finish for clean appearance on panels and enclosures

Compatibility

Designed as a standard replacement or new-installation lobed knob for equipment panels, access covers, and mechanical assemblies using 1/4-20 threaded fastener connections.

Installation Notes

Installation requires no special tools — thread the knob onto a 1/4-20 stud or bolt by hand. Before servicing any panel or enclosure, de-energize electrical circuits and follow applicable lockout/tagout procedures per OSHA and NEC guidelines. Do not overtighten; TPE knobs are designed for hand-torque applications only. Verify thread engagement is sufficient for the application load before returning equipment to service.