Knurled Thumb Screws M6 x45mm-100mm Aluminum Alloy Anodized Hand Grip Knob Bolts

These screws use the standard M6 metric thread with a 1.0 mm coarse pitch. They are compatible with any M6-tapped hole, M6 threaded insert, or M6 T-nut that accepts a standard coarse-pitch fastener.

Measure the total clamping depth — the combined thickness of all materials the screw must pass through plus any engagement depth into the receiving thread. Select a thread length that provides at least 6–8 mm of thread engagement in the tapped hole or insert beyond the panel stack. For example, a 3 mm panel with a 10 mm threaded insert would typically require a 45 mm or 50 mm screw depending on head clearance.

These aluminum alloy thumb screws are designed for panel retention, inspection covers, jig plates, and light fixture applications where hand-tightening torque is sufficient. They are not intended for high-tension structural joints, vibration-critical assemblies, or applications requiring torque values specified for steel fasteners. For load-bearing or safety-critical connections, use appropriately rated steel hardware.

The anodized coating improves corrosion resistance compared to bare aluminum by creating a harder oxide layer on the surface. These screws are suitable for indoor environments and moderate humidity. For prolonged outdoor exposure, salt spray, or immersion conditions, stainless steel fasteners are a more appropriate choice.

Yes. M6 knurled thumb screws are commonly used in 3D printer frame assemblies (particularly those using 2020/3030 aluminum extrusion with M6 T-nuts), electronics enclosure panels, CNC machine guards, and optical bench fixtures. Confirm that your extrusion or enclosure uses M6 T-nuts or tapped M6 holes before ordering.

The anodized colors serve both aesthetic and functional purposes. In multi-panel enclosures or complex assemblies, color-coded thumb screws allow quick visual identification of which screws belong to which panel or access point, reducing reassembly errors during maintenance. The color is part of the anodized layer and is not a surface paint that will chip or peel under normal use.

Each 4-piece pack contains four screws of the same size and color as selected in the variant options. Select your preferred thread length and color, then choose the 4Pcs pack quantity. Mixed color or size sets are not available in a single listing variant.