FLAT HEAD KNURLED THUMB SCREWS CARBON STEEL ZINC PLATED M8 M10 THUMBSCREWS

These screws follow the standard metric coarse thread series: M8 uses a 1.25 mm pitch and M10 uses a 1.5 mm pitch. This matches the most common tapped holes found in metric machinery, enclosures, and hardware. If your application uses a fine-pitch thread, please verify before ordering.

Match the thread diameter to your existing tapped hole or nut. M8 (8 mm nominal diameter) is common in lighter-duty fixtures, 3D printer frames, and electronics enclosures. M10 (10 mm nominal diameter) is used in heavier-duty industrial jigs, machine guards, and structural panels. When in doubt, measure the inner diameter of your tapped hole or check the thread gauge of your existing fastener.

As Grade 5 carbon steel fasteners tightened by hand, these are suited for light-to-medium clamping loads — typically access panels, jig fences, enclosure covers, and adjustable fixtures. They are not intended to replace torqued structural bolts in high-load or vibration-critical assemblies. For applications requiring precise torque values, contact us to confirm suitability.

The zinc electroplating provides meaningful corrosion resistance in dry indoor and light-industrial environments. For outdoor, marine, or high-humidity applications where prolonged moisture exposure is expected, stainless steel fasteners would be a more appropriate choice. The zinc finish is designed for workshop and enclosure use rather than exterior weathering.

Measure the total thickness of the material being clamped (the grip length), then add enough thread engagement — typically at least 1× the thread diameter for steel into steel (e.g., 8 mm engagement for M8). For example, clamping a 12 mm panel with M8 into a steel nut block would suggest a 20–25 mm screw. Always leave a small margin so the screw does not bottom out before clamping.

Yes. Because these thumb screws use standard metric coarse threads (M8 × 1.25 mm or M10 × 1.5 mm), they are compatible with any standard metric hex nut, wing nut, flange nut, or threaded insert of the matching size. They also thread directly into tapped holes in aluminium, steel, or plastic that conform to the same metric coarse standard.

For a single-use repair or prototype, the 1- or 2-piece pack keeps cost low. For a recurring jig or fixture with multiple fastening points, the 5- or 10-piece pack offers better per-unit value. The 15-piece pack suits workshop stock or batch production runs where you want spares on hand. Select your thread size and length first, then choose the quantity that matches your project scope.