Knurled Thumb Screws Large Flat Head 304 A2 Stainless Steel M3 M4 M5 M6 M8 M10

These thumb screws are available in M3, M4, M5, M6, M8, and M10 metric thread diameters. Select your required size and quantity from the variant options above.

Shank lengths range from 6 mm up to 60 mm depending on the thread size selected. Smaller diameters (M3, M4) are available in shorter lengths, while larger diameters (M8, M10) extend to longer lengths. Check the variant selector for the exact lengths available for your chosen thread size.

Yes. The screws are machined from 304 grade A2 stainless steel, which provides good resistance to oxidation and corrosion in humid, light outdoor, and general workshop environments. For highly aggressive chemical or saltwater immersion environments, contact us to confirm suitability.

These thumb screws use standard ISO metric thread. Standard coarse pitch is assumed for each diameter (e.g., M3×0.5, M4×0.7, M5×0.8, M6×1.0, M8×1.25, M10×1.5). If your application requires a fine pitch, contact us to confirm before ordering.

Yes. The standard metric thread profile is compatible with ISO metric nuts, threaded inserts, and tapped holes of the corresponding size. Ensure the thread pitch of your nut or insert matches the standard coarse pitch of these screws.

Measure the total thickness of the material(s) being clamped, then add the engagement depth required in your nut or threaded insert (typically 1–1.5× the thread diameter for stainless steel). Select the next available length that meets or slightly exceeds this total. If you are unsure, contact us to confirm.

Pack quantities range from 1 piece up to 100 pieces depending on the size selected. Options include 1, 2, 4, 5, 10, 20, 25, 40, 50, and 100 pcs. Select the quantity that matches your project requirement from the Amount (Pcs) variant option.