M6*12~100mm Knurled Thumb Screws High Type Hand Grip Knob Bolts Aluminum Handle

The D12×20mm head is suited for tight spaces where adjacent components limit lateral clearance, such as compact electronics enclosures or closely spaced panel fasteners. The D20×20mm head provides a larger bearing surface and a wider grip diameter, making it easier to apply torque by hand — particularly useful when wearing gloves or when the screw needs to be tightened more firmly. If clearance is not a constraint, the D20 head is generally easier to operate.

Measure the total thickness of the material stack the screw must pass through, then add the depth of the threaded hole or nut. The shaft length should be at least equal to this combined dimension. For blind threaded holes, ensure the shaft does not bottom out before the head clamps the panel. For through-hole applications with a nut, the shaft should extend at least 3–5 thread pitches (3–5mm for M6) beyond the nut face for secure engagement.

These screws are designed for hand-tightening applications where moderate clamping force is sufficient — typically panel covers, access doors, jig fixtures, and adjustment mechanisms. Aluminum knob thumb screws are not intended for high-torque structural joints. If your application requires significant clamping load, consider using a standard hex bolt with a tool for final tightening, or evaluate whether a steel thumb screw is more appropriate.

Aluminum alloy has inherent oxidation resistance due to its natural oxide layer, making these screws suitable for indoor environments and light-duty outdoor use where exposure to moisture is occasional rather than continuous. They are not recommended for marine environments, prolonged chemical exposure, or applications where galvanic corrosion with dissimilar metals is a concern. For harsh environments, stainless steel thumb screws would be a more appropriate choice.

Yes. These screws use standard M6×1.0mm metric coarse thread, which is compatible with M6 hex nuts, flange nuts, T-nuts, threaded inserts (brass or steel), and any standard M6 tapped hole. No special hardware is required. Verify that the mating thread material is compatible with aluminum — avoid pairing with very hard steel threads in high-cycle applications to minimize galling risk.

The Red, Black, and White color options are achieved through anodizing or surface treatment of the aluminum knob. The color difference is primarily functional for identification purposes — for example, using red for critical adjustment points, black for standard fasteners, and white for reference or calibration positions. The mechanical properties and thread specifications are identical across all three colors. Choose based on your color-coding system or aesthetic preference.

Each variant is available in packs of 1, 2, 5, or 10 pieces. Select the quantity that matches your project needs. For prototyping or single-machine builds, a 1 or 2-piece pack is typically sufficient. For production runs, jig sets, or stocking spare hardware, the 5 or 10-piece packs offer better per-unit value. The packing quantity is shown in the "Head size (Ø×H) & Packing Qty" variant selector.