M6 M8 M10 Black Plastic Rosette Pentagram Star Thumb Screws Hand Grip Knob Bolts

Match the thread diameter to your existing threaded hole or insert. M6 (6 mm nominal diameter) is common in light-duty fixtures, 3D printer frames, and electronics enclosures. M8 suits medium-duty machinery guards and jig fences. M10 is used where higher clamping force is needed, such as heavier CNC fixtures or structural panels. If unsure, measure the hole diameter with a caliper — the nominal thread size is slightly smaller than the hole diameter.

These are designed for hand-tightened, tool-free applications where moderate clamping force is sufficient — such as securing access panels, positioning stops, or holding lightweight guards in place. The carbon steel shank provides adequate tensile strength for these tasks. They are not intended as structural fasteners in high-vibration or high-load joints where a torqued hex bolt would be specified.

The carbon steel shank has a surface finish that provides basic protection, but carbon steel is not inherently corrosion-resistant. For outdoor use or consistently humid environments, consider applying a light coating of anti-corrosion spray to the shank, or contact us to confirm suitability for your specific conditions. The plastic knob itself is unaffected by moisture.

The rosette knob is molded from a rigid plastic designed for repeated hand-tightening cycles. Cracking is unlikely under normal hand-applied torque. Avoid using tools (pliers, wrenches) on the knob, as mechanical over-torquing can stress the plastic beyond its design limits. For applications requiring tool-tightened torque, a standard hex bolt is more appropriate.

Yes — M6 and M8 variants are commonly used with T-slot nuts in 20-series and 30-series aluminum extrusion profiles (e.g., 2020, 3030 profiles). Verify that the T-slot nut thread matches the thumb screw diameter and that the shank length is appropriate for your panel thickness plus nut engagement depth.

The shank length should be long enough to pass through your panel or bracket and engage at least 1–1.5× the thread diameter into the receiving nut or threaded hole (e.g., at least 6 mm engagement for M6). Add your panel thickness to the minimum engagement depth to determine the minimum shank length needed. Choose the next available length up from that calculation.

Each size and pack quantity combination has its own SKU for accurate inventory tracking. When reordering, select the same thread diameter, shank length, and pack quantity to ensure you receive the identical variant.