![terminology - What do the numbers in screw sizes M3, M4 etc. mean? - Home Improvement Stack Exchange terminology - What do the numbers in screw sizes M3, M4 etc. mean? - Home Improvement Stack Exchange](https://i.stack.imgur.com/oVr5u.jpg)
terminology - What do the numbers in screw sizes M3, M4 etc. mean? - Home Improvement Stack Exchange
![50Pcs M0.8 m 1.0 m 1.2 m 1.4 m 1.6 m 2.5 m 3 m 4 stainless steel round head screws head cross screws (Color : M4, Size : 25mm) : Amazon.co.uk: DIY & Tools 50Pcs M0.8 m 1.0 m 1.2 m 1.4 m 1.6 m 2.5 m 3 m 4 stainless steel round head screws head cross screws (Color : M4, Size : 25mm) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61GcaWedujL._AC_SL1500_.jpg)
50Pcs M0.8 m 1.0 m 1.2 m 1.4 m 1.6 m 2.5 m 3 m 4 stainless steel round head screws head cross screws (Color : M4, Size : 25mm) : Amazon.co.uk: DIY & Tools
![Hexagon Head High Tensile Bolt BZP Grade 8.8 DIN 931 – M 8 x 45mm (Coarse) – Forest of Dean Fasteners Hexagon Head High Tensile Bolt BZP Grade 8.8 DIN 931 – M 8 x 45mm (Coarse) – Forest of Dean Fasteners](https://forestofdeanfasteners.co.uk/wp-content/uploads/2019/03/fullsizeoutput_3bba.jpeg)