M5 Knurled Thumb Screws Aluminium Hand Grip Knob Bolts High Type 50 - 100mm Long

Measure the total thickness of the material(s) you need to clamp or pass through, then add 3–5 mm for thread engagement in the nut or insert. For example, if your panel is 10 mm thick and you are threading into a 5 mm deep insert, a 15 mm engagement depth is needed — choose the next available length at or above that figure. The available shank lengths (excluding head) are 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, and 100 mm.

These thumb screws are designed for hand-tightened, frequently adjusted connections — such as access panels, enclosure lids, jig fixtures, and RC body shells — rather than high-torque structural joints. Aluminium alloy provides adequate strength for typical hand-tightening loads. If your application requires torque wrench tightening or significant shear loads, a steel fastener is more appropriate.

Anodising is an electrochemical process that converts the aluminium surface into a hard oxide layer — the colour is integral to the material, not a paint coat sitting on top. Under normal hand-tightening use, the finish is durable. Abrasive contact with hard metal surfaces over many cycles may cause gradual wear at contact points, which is typical for any anodised aluminium fastener.

Yes. The M5 × 0.8 mm thread is the standard fastener size for 20-series, 30-series, and 40-series aluminium extrusion profiles. Pair these thumb screws with M5 T-nuts or drop-in T-nuts for tool-free panel attachment and quick-release access on extrusion frame builds.

Anodised aluminium has reasonable corrosion resistance for light outdoor or humid indoor use. However, aluminium is not as corrosion-resistant as stainless steel in prolonged salt-spray or marine environments. For outdoor applications with regular moisture exposure, consider applying a light coating of anti-seize compound to the threads to prevent galvanic corrosion if mating with dissimilar metals.

The 1-piece pack is suitable when you need a single replacement fastener or are testing a size before committing to a larger order. The 2-piece pack offers a modest cost saving per unit and is practical for applications that use two thumb screws symmetrically — such as opposite corners of an access panel or both sides of a jig clamp.

A high-type (also called tall-head) thumb screw has a taller knurled head than a standard or low-profile thumb screw. The increased head height gives more surface area for your fingers to grip, making it easier to apply torque by hand — particularly useful when the screw is recessed slightly or when gloves are worn. Standard-height heads are lower-profile and suit applications where clearance above the fastener is limited.