Gibraltar TS-420-G Steel Thumb Screw M4 X 0.7 Knurled Head

Product Description

The GIBRALTAR TS-420-G is a metric thumb screw designed for hand-tightened fastening applications where tools are not required. The fastener features a knurled plastic head for secure grip and a zinc-plated steel body for corrosion resistance. With an M4 x 0.7 thread, a 20 mm knurled head diameter, and a 34 mm overall length, this thumb screw suits panel assembly, enclosure access covers, and equipment adjustment points. The shouldered shank provides a positive registration surface. Installers in electrical, mechanical, and light fabrication trades use this type of fastener for frequent-access assemblies.

This thumb screw is suited for light-duty metric fastening in control panels, enclosures, jigs, fixtures, and instrumentation housings. The with-shoulder design allows the screw to locate against a mating surface before thread engagement, which is useful in alignment-sensitive assemblies. The black plastic knurled head provides a comfortable grip surface and contrasts against metal panels for easy identification. It is appropriate for indoor applications where moderate corrosion resistance is adequate.

Key Features

• M4 x 0.7 metric thread for compatibility with standard metric tapped holes
• Knurled black plastic head, 20 mm diameter, for tool-free hand tightening
• With-shoulder design for positive part location and alignment
• Zinc-plated steel body for corrosion resistance in light-duty applications
• Compact 8 mm head height keeps the fastener low-profile in tight clearances
• 12 mm shoulder diameter provides a stable bearing surface

Compatibility

Designed as a standard metric thumb screw for use in any application requiring an M4 x 0.7 threaded hand-fastener with a shouldered shank and knurled head.

Installation Notes

Install by hand into a pre-tapped M4 x 0.7 metric hole. Do not use power tools or wrenches on the plastic head, as overtorquing will crack or strip the head. Verify thread engagement is complete before applying load. Confirm the mating material and environment are compatible with zinc-plated steel and plastic components before installation.