M5/6/8/10 Pentagram Star Thumb Screws Hand Grip Knob Bolts Carbon Steel/Bakelite

Match the thread size to your existing tapped hole or threaded insert. M5 is common in PC case panels and thin aluminum extrusions; M6 and M8 are standard in heavier extrusion frames and enclosure hardware; M10 suits larger structural assemblies. If you're unsure, measure the inner diameter of your existing hole — M5 taps to ~5mm, M6 to ~6mm, M8 to ~8mm, M10 to ~10mm.

Carbon steel thumb screws offer higher tensile strength and are suited for structural or load-bearing panel retention. Bakelite (a thermosetting plastic) thumb screws are lighter, electrically non-conductive, and resistant to moderate heat — making them a better fit for electronics enclosures, PC builds, or anywhere you want to avoid metal-to-metal contact on sensitive components.

The carbon steel variants are not inherently corrosion-resistant and are best suited for indoor use. For humid or outdoor environments, consider applying a light coating of machine oil or contact us to confirm finish options. Bakelite variants are unaffected by moisture and are a practical choice for damp enclosures.

Yes — as long as the thread size matches the T-nut specification (e.g., M5 thumb screw into an M5 T-nut in a 20-series or 30-series extrusion slot). The star knob head sits above the slot surface, so verify that the head diameter (25–50mm depending on size) does not interfere with adjacent components in your assembly.

The five-point star profile allows meaningful hand torque for panel retention — sufficient for securing access covers, side panels, and non-structural enclosure fastening. These are not intended as a replacement for tool-tightened structural bolts in high-vibration or load-bearing applications. For critical joints, use a wrench-driven fastener and reserve these for access points you open frequently.

Select a shank length that provides at least 1× the thread diameter of engagement depth into your tapped hole or nut (e.g., at least 5mm engagement for M5). For panel pass-through applications, add the panel thickness to the required engagement depth to determine minimum shank length. When in doubt, size up — a longer shank with a nut or spacer is easier to manage than a shank that bottoms out before clamping.

Yes, with care. Hand-tightening limits the torque applied, which reduces the risk of cracking brittle materials like acrylic. Use a washer under the knob head to distribute the clamping load over a larger surface area. Avoid over-tightening — snug is sufficient for panel retention on plastic substrates.