M6 KNURLED THUMB SCREWS ALUMINIUM ALLOY&STAINLESS HAND GRIP KNOB BOLTS L:50-70mm

Measure the total thickness of the material being fastened plus the depth of your tapped hole or nut. The shaft length (excluding the head) should be long enough to achieve at least 1× the thread diameter (6 mm) of engagement — ideally 1.5× or more for reliable holding. For thin panels up to ~8 mm, 50 mm is typically sufficient; for stacked panels or deeper inserts, choose 60 mm or 70 mm.

Aluminium alloy thumb screws are well-suited for light-duty fastening tasks such as panel retention, enclosure covers, and instrument housings where hand-tightening torque is the design intent. They are not recommended for high-vibration, high-load, or safety-critical structural joints where steel fasteners and torque-controlled installation are required.

Anodising creates an oxide layer on the aluminium surface that improves corrosion resistance compared to bare aluminium. These screws are suitable for typical indoor environments and light-outdoor use where they are not continuously exposed to standing water, salt spray, or harsh chemicals. For marine or highly corrosive environments, stainless steel fasteners are a more appropriate choice.

Yes — as long as your tapped hole or insert is M6 × 1.0 (standard metric coarse pitch), these thumb screws will thread in directly. If your application uses M6 fine pitch (e.g., 0.75 mm), these screws will not be compatible. Check your existing fastener markings or use a thread gauge to confirm pitch before ordering.

Yes. A standard M6 × 1.0 hex nut, flange nut, or wing nut will mate correctly with these thumb screws. This makes them useful for through-bolt applications where you want hand-adjustable clamping — for example, securing a removable jig plate or a hinged access door.

Colour selection is primarily functional or aesthetic. A common approach is to assign one colour per subsystem — for example, Black for power-related panels, Red for safety-access covers, and Silver for general enclosures. This makes it immediately obvious which fasteners belong to which assembly during maintenance. All colours are the same material and dimensions; only the anodised finish differs.

For a single enclosure with 4 panel screws, a pack of 4 or 6 gives you the exact count plus a spare. For prototyping or sampling a new colour, a pack of 1 or 2 lets you verify fit and appearance before committing to a larger quantity. Packs of 5 or 6 offer the best per-unit value for builds requiring multiple identical fasteners.