M8 Metric Thread
Direct Answer
M8 is an ISO metric machine screw thread with a nominal major diameter of 8.0 mm and a standard coarse pitch of 1.25 mm. Requiring a 6.80 mm tap drill, it is the standard fastener for VESA MIS-F large TV wall mounts (400×400 mm and 600×400 mm), automotive suspension brackets, and heavy furniture.
Source: ISO 68-1 / ISO 261 / DIN 13-1 / VESA FDMI Standard
Specs
| Nominal Major Diameter | 8.00 mm |
| Standard Coarse Pitch | 1.25 mm |
| Fine Pitch (Optional) | 1.00 / 0.75 mm |
| Tap Drill Diameter | 6.80 mm (75% thread engagement) |
| Minor Diameter (Internal) | 6.647 mm |
| Tensile Stress Area | 36.6 mm² |
| Common Drive Size | 13mm Hex / 6.0mm Allen / T40 / T45 |
VESA MIS-F Large Television Wall Mounts
The VESA MIS-F specification mandates M8 machine screws (ranging in lengths from M8×15mm to M8×45mm, often requiring plastic spacers on curved back panels) for all medium-to-large consumer TVs (43-inch to 85-inch displays with 300×300, 400×400, or 600×400 mm hole patterns).
Automotive and Industrial Fastening
M8 bolts (typically driven by a 13 mm socket) are standard across automotive alternator brackets, exhaust hangers, suspension sway bar end-links, and structural steel framing.