Plastic Black Rosette Thumb Screws M6 M8 M10 M12 Knob Bolt Star Head 38 48mm

The 38 mm head is suited to confined spaces where a smaller knob fits more easily, while the 48 mm head provides a larger grip surface and more leverage for hand-tightening. If you need to apply more clamping force by hand — for example on a jig that vibrates during use — the 48 mm head is the better choice.

These screws use standard metric coarse pitch threads. For M6 that is typically 1.0 mm pitch, M8 is 1.25 mm, M10 is 1.5 mm, and M12 is 1.75 mm. If your application requires a fine-pitch thread, please contact us to confirm before ordering.

The carbon steel shank is not stainless and will corrode if exposed to moisture over time. For occasional outdoor or damp-area use, applying a light coat of grease or thread sealant to the shank will extend service life. For continuously wet or corrosive environments, a stainless steel thumb screw would be more appropriate.

No. The shank length listed in the variant name (e.g., M8×30mm) refers to the threaded portion only and does not include the height of the plastic knob head. When calculating the required fastener length for your application, measure the material thickness and add any required thread engagement depth — the knob sits on top of the surface.

Yes. These thumb screws use standard metric coarse threads and will engage any M6, M8, M10, or M12 threaded insert, T-nut, or tapped hole machined to standard tolerances. They are commonly used with press-in or heat-set inserts in aluminum extrusions, MDF, and plastic panels.

Hand torque depends on grip strength and knob diameter. The 48 mm head allows more leverage than the 38 mm head. These fasteners are designed for clamping and panel retention applications where hand-tight is sufficient — they are not intended to replace torqued structural bolts. For applications requiring a specific clamping force, use a torque wrench on the steel shank with a suitable socket.

Yes, provided the thread diameter and pitch match and the shank length is appropriate for your material stack. Measure the existing bolt's thread diameter, pitch, and shank length, then select the matching variant. The main difference is that the rosette knob replaces the hex head, enabling tool-free adjustment.