M3 x 35mm Aluminum Knurled Thumb Screws Colorful Hand Grip Knob Bolts

These are M3 x 35mm knurled thumb screws with a standard M3 metric coarse thread at 0.5mm pitch. The 35mm (≈1-3/8") length is generally suitable for fastening thicker panels or stacked components. Assuming 3–6mm of thread engagement, they can typically accommodate a combined material thickness of roughly 29–32mm. They fit any M3-threaded hole, brass heat-set insert, or M3 nut following the ISO metric thread standard.

The 35mm length is useful when you need to fasten through thicker materials, stacked panels, or when a spacer or standoff is involved in the assembly. If your application involves a single thin panel, a shorter length such as 20mm may be more appropriate. Generally, choose a length that provides at least 3–4mm of thread engagement beyond the total material thickness.

These screws are made from aluminum alloy, which makes them significantly lighter than steel fasteners. Aluminum alloy is generally suitable for light-duty hand-tightened applications where weight savings and color variety matter more than maximum tensile strength — such as 3D printer panels, RC chassis, and electronics enclosures.

Aluminum alloy is generally lighter and softer than steel. For hand-tightened applications such as panel covers, 3D printer frames, RC model chassis, and electronics enclosures, aluminum thumb screws are typically sufficient. They are not recommended for high-torque or structural load-bearing applications where steel fasteners would be more appropriate.

Aluminum alloy has natural oxidation resistance and generally performs well in dry or mildly humid indoor environments. For prolonged outdoor or high-moisture exposure, aluminum is generally less corrosion-resistant than stainless steel in harsh outdoor conditions. Contact us if you need guidance for your specific environment.

These screws use the standard M3 metric coarse thread at 0.5mm pitch, conforming to ISO 68-1. They are compatible with any M3-threaded hole, brass heat-set insert, or standard M3 nut — including those commonly used in 3D printer frames, electronics enclosures, and RC model chassis.

These thumb screws are available in 10 colors: Royal Blue, Sky Blue, Dark Red, Rose, Black, Silver, Deep Purple, Green, Golden, and Orange. Select your preferred color from the variant options above. Many builders choose colors that match their build theme, or use a contrasting color to make access panels easy to identify at a glance.