Gibraltar 1RM8B921A8Z001G Fluted Knob 1/4-20 Threaded Stem

Product Description

The GIBRALTAR 1RM8B921A8Z001G is a fluted knob with a threaded stem, designed for manual adjustment and control applications across industrial, mechanical, and light equipment settings. The knob features a 1.87-inch head diameter and a 1/4-20 threaded stem with 0.5 inches of thread engagement length. The body is molded from thermoplastic elastomer, which provides a firm yet comfortable grip surface. Technicians and assemblers use this style of knob wherever tool-free hand adjustment is required on threaded fastener points, jigs, fixtures, or equipment panels.

This fluted knob suits a broad range of applications including HVAC equipment panels, electrical enclosures, industrial machinery, and shop fixtures where a secure hand-tightened connection is needed. The 1/4-20 threaded stem is a standard unified coarse thread, making it compatible with widely available threaded inserts and studs. The compact hub profile and defined fluting pattern allow confident grip even in gloved-hand conditions typical of trade service environments.

Key Features

• 1.87-inch head diameter for a confident hand grip without tools
• 1/4-20 threaded stem with 0.5-inch thread length for standard fastener compatibility
• Thermoplastic elastomer construction provides durability and grip texture
• 1.5-inch hub diameter and 0.22-inch hub height for low-profile mounting
• 2.44-inch head height suits applications requiring added knob clearance
• Lightweight at 0.16 pounds, suitable for panel and fixture use

Compatibility

Designed as an OEM-style replacement or standard hardware component for equipment and fixtures using 1/4-20 threaded stems requiring manual hand-adjustment knobs.

Installation Notes

Installation does not require specialized tools — thread the knob stem onto a compatible 1/4-20 stud or insert by hand. Before installing on powered equipment, de-energize the system and follow applicable lockout/tagout procedures. Verify thread engagement depth against the 0.5-inch stem length to avoid bottoming out on blind threaded holes. Do not use power tools to drive this knob onto the threaded interface.