M8 M10 Thumb Screws Hand Knob Grip Bolts Black Plastic Hexalobular Star Head

Measure the total thickness of all the material layers the screw must pass through (panel, spacer, washer, etc.) and add the minimum thread engagement depth — typically 1× the thread diameter for metal (8 mm for M8, 10 mm for M10) or 1.5–2× for softer materials. Select the next available length above that total. For example, a 6 mm panel with a 10 mm metal insert requires at least 16 mm of thread; the 20 mm option would be the correct choice.

M8 refers to a nominal thread outer diameter of 8 mm (~0.315 in) and M10 refers to 10 mm (~0.394 in). M8 is the lighter-duty option suited to thinner panels and lower clamping loads, while M10 provides a larger bearing surface and higher torque capacity for heavier covers or more frequent cycling. Check the thread size of your existing tapped hole or insert before ordering.

Yes. The threaded shank uses standard metric coarse pitch, which is compatible with M8 and M10 hex nuts, flange nuts, T-nuts, and threaded inserts that follow ISO metric standards. If your application uses a fine-pitch tapped hole, contact us to confirm compatibility before ordering.

These thumb screws are designed for hand-tightened, tool-free applications — not for high-torque structural joints. The plastic knob is sized for finger-and-thumb grip and is suitable for securing removable panels, lids, and covers where the fastener is tightened and released regularly. For applications requiring a defined torque value or significant clamping load, a standard hex bolt with a wrench is the appropriate choice.

The black plastic knob is suitable for typical indoor workshop, electronics, and light industrial environments. Prolonged exposure to direct UV sunlight, strong solvents, or temperatures above approximately 80 °C may affect the plastic over time. For outdoor or high-temperature applications, contact us to confirm suitability before ordering.

Yes, provided the existing tapped holes or nuts are M8 or M10 metric thread. Measure the thread diameter and the grip length (the distance from the underside of the head to the start of the thread engagement zone) to select the matching thread length variant. If the original bolts used a washer, factor that thickness into your length calculation.

Yes. The 1 Pcs, 5 Pcs, and 10 Pcs options for any given Thread Diameter + Thread Length combination are identical screws — only the quantity per order differs. Buying in larger packs reduces the per-unit cost and is useful when fitting multiple access points on the same enclosure or stocking spares.