High Knurled Thumb Screws M5 x45mm-100mm Shoulder Bolts Aluminium Hand Grip Knob

Measure the total thread engagement depth in your mating part (threaded insert, T-nut, or tapped hole). The screw length listed is the shank length excluding the head. Add clearance for any panel thickness the screw passes through before reaching the threaded section. When in doubt, size up — a longer screw with a locking nut is easier to manage than a screw that bottoms out before clamping.

These thumb screws are designed for light-to-medium clamping loads — panel retention, access covers, and enclosure lids. They are not rated for high-torque or vibration-critical structural joints. For applications subject to sustained vibration (e.g. motor mounts), consider adding a nylon-insert lock nut or thread-locking compound on the mating side.

Anodising creates an oxide layer that is harder than bare aluminium and provides good resistance to light abrasion and oxidation in typical indoor environments. It is not rated for prolonged exposure to salt spray, strong acids, or alkaline cleaners. For outdoor or high-humidity enclosures, consider a protective coating on the mating surfaces as well.

Yes — M5 is the standard thread size for most 2020 and 2040 series aluminium extrusion T-slot hardware. These screws will thread into standard M5 T-nuts and drop-in nuts. Verify the T-nut thread depth against your selected screw length to ensure adequate engagement (typically 6–10 mm minimum).

The shoulder bolt profile — the unthreaded cylindrical section between the head and the threaded portion — can serve as a locating feature in clearance holes, keeping panels or jig plates registered while you tighten. This is particularly useful in repeated assembly/disassembly workflows where positional repeatability matters.

Colour coding lets you assign a specific colour to each access zone — for example, blue for the top panel, black for the side panels, and red for a service-only cover. This reduces the chance of opening the wrong panel under time pressure and gives your build a intentional, finished look. The tool-free design also means faster iteration cycles during prototyping or maintenance.

The 1-piece option is ideal for replacing a single lost or damaged fastener, or for sampling a colour before ordering in bulk. The 2-piece pack covers symmetrical panel points (e.g. left and right side of a lid) in a single order. You can mix different sizes and colours across multiple line items to build a complete custom fastener kit.