Zinc Plated Thumb Screws Hand Knob Grip Bolt Black Plastic Hexalobular Star Head

Match the thread diameter to your tapped hole or nut: M8 for lighter panels and small fixtures, M10–M12 for medium-duty enclosures and jigs, M14–M16 for heavier structural access points. Always verify the thread pitch of your existing hardware before ordering to ensure compatibility.

The Hexagonal Head has six lobes and a 48 mm or 60 mm diameter; the Heptagon Head has seven lobes and a 60 mm diameter. The seven-lobe profile provides slightly more grip surface area, which can be useful when higher hand torque is needed or when gloves are worn during operation.

Zinc plating provides moderate corrosion resistance appropriate for indoor environments and sheltered outdoor locations. For prolonged direct exposure to rain, salt spray, or high humidity, consider stainless steel alternatives. The zinc coating also acts as a sacrificial layer that slows base-metal corrosion if the surface is scratched.

Yes. The hexalobular star recess in the grip head accepts a standard Torx bit (T-handle or power driver). This is useful when the fastener needs to be torqued beyond comfortable hand-tightening, or when working in confined spaces where finger access is limited.

Measure the total material thickness the bolt must pass through, then add at least 1.5× the thread diameter for adequate thread engagement. For example, a 10 mm panel with M8 thread should use at minimum a 22 mm thread length (10 mm panel + 12 mm engagement). Longer lengths are available up to 100 mm for deeper assemblies.

Yes. The shank uses standard ISO metric thread profiles (M8 through M16), so they are compatible with DIN 934 hex nuts, flanged nuts, and metric threaded inserts of the corresponding size. Confirm thread pitch matches your existing hardware, as coarse and fine pitch variants exist for some diameters.

The 1-piece pack is suited for prototyping or single-unit repairs where only one fastener is needed. The 2-piece pack covers paired fastening points such as opposite corners of a panel. The 5-piece pack offers a cost-effective option for small production runs, maintenance kits, or when spares are needed alongside the primary installation.