Gibraltar ALH-20MTT Lobed Knob Aluminum M8x1.25

Product Description

The GIBRALTAR ALH-20MTT is a 4-point lobed knob machined from 6063-T5 aluminum, designed for hand-tightening applications on threaded assemblies. The lobed profile provides firm finger grip without the need for tools, making it a common choice for adjustable fixtures, enclosures, machine guards, and panel assemblies. With a 38.1 mm head diameter and an M8 x 1.25 threaded stem, this knob fits standard metric fastener configurations. The lightweight aluminum construction keeps added mass low while providing adequate torque for most clamping and positioning tasks. Machinists, maintenance technicians, and equipment fabricators install this type of hardware during assembly or field adjustment work.

This lobed knob is suited for light industrial, commercial equipment, and general mechanical assembly applications where manual adjustment is required. The M8 x 1.25 stem size is a widely used metric thread standard, making it compatible with threaded inserts, studs, and bolts found across a broad range of manufactured equipment. It is appropriate for both OEM assembly and aftermarket replacement in settings where tool-free operation is required for frequent adjustments.

Key Features

• 4-point lobed profile for secure finger grip without tools
• 6063-T5 aluminum construction for lightweight, corrosion-resistant performance
• M8 x 1.25 threaded stem fits standard metric hardware
• 38.1 mm head diameter provides comfortable hand-tightening leverage
• 16 mm hub diameter with 9.5 mm hub height for stable seating on mating surfaces
• 22.2 mm overall height suits compact assembly clearances

Compatibility

Designed for use with M8 x 1.25 threaded studs, inserts, or bolts in light industrial and general mechanical assemblies requiring hand-operated adjustment knobs.

Installation Notes

Installation requires no special tools — thread the knob onto a compatible M8 x 1.25 stud or insert by hand. Ensure the mating threaded component is free of debris and corrosion before installation. Do not use impact tools or wrenches, as the lobed knob is designed for hand torque only and overtightening may damage the aluminum hub.