Gibraltar SBK-053-G Ball Knob Threaded Hole Steel

Product Description

The GIBRALTAR SBK-053-G is a smooth-grip ball knob with a threaded hole mount, designed for use in mechanical assemblies, control panels, and equipment where a secure, hand-operated fastening point is needed. Machined from steel with a natural finish, it measures 1.88 inches in diameter and accepts a 1/2-20 threaded shaft up to 0.75 inches deep. The smooth surface and spherical profile provide a comfortable grip for repeated manual adjustments. This type of hardware is installed by maintenance technicians, industrial mechanics, and trade professionals working on control equipment, fixtures, and mechanical enclosures.

The SBK-053-G is suited for light to medium-duty applications where a hand-tightenable knob is required on a threaded stud or bolt. Common use cases include machine guards, access panels, equipment covers, and adjustable fixtures in commercial and industrial settings. The 1/2-20 thread size is a standard unified fine thread, making this knob compatible with a wide range of threaded fasteners used across trade and industrial environments.

Key Features

• Threaded hole mount with 1/2-20 thread size for secure engagement on standard fine-thread studs
• 0.75-inch hole depth provides adequate thread engagement for reliable hand-tightened holding force
• 1.88-inch diameter spherical body allows comfortable grip without tools
• Steel construction offers durability in mechanical and industrial service environments
• Natural finish — no coating to chip or flake in service conditions
• Smooth grip surface suits applications where gloved-hand operation is common

Compatibility

Designed as a direct-mount ball knob for any 1/2-20 threaded stud or bolt in mechanical assemblies, control enclosures, and equipment panels requiring tool-free hand adjustment.

Installation Notes

Installation requires only threading the knob onto a compatible 1/2-20 stud or bolt by hand. Ensure the mating thread is clean and free of burrs before engagement to avoid cross-threading or premature wear. De-energize or lock out any equipment before replacing knobs on live control panels or moving assemblies. Do not use impact tools on this knob — it is rated for hand-tightening only.