M2/M2.5/M3 Black Countersunk Hex Socket Screws (Pack of 10)

Black-coated carbon steel countersunk screws with an internal hex (Allen) socket, sold in packs of 10. The flat head sits flush in a chamfered hole, so use them wherever a protruding head would foul: frame bottom plates, arm clamps, motor and camera mounts, or 3D-printed parts.

Key features

• Three metric thread sizes, M2, M2.5 and M3, in lengths from 4 mm to 40 mm; choose the exact size and length from the options
• Countersunk (flat) head that finishes flush with the mounting surface
• Internal hex socket for tightening with a standard hex key or driver
• Carbon steel with a black coating for corrosion resistance
• 10 screws of one size and length per pack

Specifications

• Head type: Countersunk (flat), internal hex socket
• Thread: Metric M2, M2.5, M3
• M2 lengths: 4, 5, 6, 8, 10, 12 mm
• M2.5 lengths: 6, 8, 10, 12, 14, 16 mm
• M3 lengths: 4, 5, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40 mm
• Material: Carbon steel, black coated
• Quantity: 10 screws per pack

Countersunk screw length is measured overall, head included, so allow for the plate thickness when working out thread engagement. M3 is the usual size for 30.5x30.5 stacks and 5-inch frame hardware, while M2 fits most 20x20 stacks and micro frames.