Knurled Thumb Screws Aluminium Handle + Stainless Rod Hand Grip Knob Bolts M6

All variants use a standard Metric M6 thread (6 mm nominal diameter). They are compatible with M6 threaded inserts, T-slot T-nuts, and standard M6 hex nuts. If your application uses a different thread size, these screws will not fit.

The D12 (12 mm diameter) handle is more compact and suits confined spaces or applications where multiple thumb screws are positioned close together. The D20 (20 mm diameter) handle provides a larger grip surface, making it easier to apply more torque by hand — useful for panels that need a firmer seal or where gloves are worn regularly.

Measure the total thickness of the material(s) being clamped, then add at least 5–8 mm for thread engagement into the nut or insert. For example, if your panel stack is 15 mm thick and you are threading into a 6 mm T-nut, choose M6×20 mm or M6×25 mm. Avoid selecting a thread length so long that the rod bottoms out before the handle seats against the panel.

The threaded rod is stainless steel, which provides good resistance to moisture and mild chemical exposure. The aluminium handle is anodised, adding a layer of surface protection against oxidation. These fasteners are suitable for indoor workshop use and light outdoor exposure, but are not rated for continuous immersion or highly corrosive environments.

Yes. The M6 stainless steel rod has a standard metric thread pitch (typically 1.0 mm for M6 fine or 1.0 mm coarse — verify with your nut supplier if pitch-critical). They mate with standard M6 hex nuts, wing nuts, T-nuts, and threaded inserts without modification.

Red, Black, and Silver refer to the anodised finish colour of the aluminium handle only — the stainless steel rod remains the same across all colours. The colour difference is purely aesthetic and functional for colour-coding: for example, using Red for adjustment points and Black for fixed fasteners on the same assembly to aid quick identification during setup.

For most projects requiring four or more fasteners of the same specification, the 5-pack or 10-pack offers a lower per-unit cost. Singles are best when you need one replacement or are testing a size before committing to a larger quantity. Check the per-piece price on each variant before ordering.