M4 Metric Thread
Direct Answer
M4 is an ISO metric machine screw thread with a nominal major diameter of 4.0 mm and a standard coarse pitch of 0.70 mm. Requiring a 3.30 mm tap drill, it is the mandated standard fastener for VESA MIS-D (75×75 mm and 100×100 mm) computer monitor and small TV wall mounting brackets.
Source: ISO 68-1 / ISO 261 / DIN 13-1 / VESA Flat Display Mounting Interface (FDMI)
Specs
| Nominal Major Diameter | 4.00 mm |
| Standard Coarse Pitch | 0.70 mm |
| Fine Pitch (Optional) | 0.50 mm |
| Tap Drill Diameter | 3.30 mm (75% thread engagement) |
| Minor Diameter (Internal) | 3.242 mm |
| Tensile Stress Area | 8.78 mm² |
| Common Drive Size | PH2 / PZ2 / 3.0mm Hex / T20 |
VESA MIS-D Display Mounting Standard
The Video Electronics Standards Association (VESA) FDMI standard mandates M4 metric machine screws (typically M4×10mm or M4×12mm) for all MIS-D compliant displays (75×75 mm and 100×100 mm hole patterns, covering virtually all 19-inch to 32-inch desktop computer monitors).
Consumer Electronics and Appliance Assembly
M4 machine screws are the primary structural fastener for domestic appliances (microwaves, washing machine panels), AV receiver chassis, and commercial electrical enclosure panels.