What is 10g screw in mm

A #10 gauge screw has a major diameter of approximately 4.8 mm (0.190 inches exactly in imperial measurement). This refers to the American screw numbering system where gauge numbers represent specific diameter standards for machine screws and self-tapping fasteners. The #10 gauge is a commonly used size in construction, woodworking, and general assembly applications, sitting between #8 (4.2 mm) and #12 (5.5 mm) in the standard progression.

It's important to note that "10g" typically refers to the gauge (diameter) of the screw shaft, not the thread pitch or length. The same #10 gauge screw can come in various thread pitches (threads per inch) and lengths depending on the application—common variants include 10-24 (24 threads per inch for machine screws) and 10-32 (32 threads per inch for finer threading). When specifying screws for precision work, you'll need both the gauge number and thread specification. For metric-to-imperial fastener substitutions, a #10 screw is roughly equivalent to an M5 (5 mm) metric screw, though direct substitution isn't recommended for critical applications as thread forms and pitches differ between systems, potentially affecting holding strength and thread engagement.