What Drill Bit Size is Needed for an M8 Screw? | Guide for M8 x 1.25 & M8 x 1 Threads
Learn the correct drill bit sizes for M8 screws. Use 6.8mm for M8 x 1.25 and 7mm for M8 x 1 threads. Tips for choosing drill bits by material.
216 views
To drill a hole for an M8 screw, use a 6.8 mm drill bit for a standard M8 x 1.25 thread. If you need a finer thread, such as M8 x 1, go for a 7 mm drill bit. Ensure the drill bit is appropriate for the material being drilled.
FAQs & Answers
- What size drill bit should I use for an M8 screw? For a standard M8 x 1.25 thread, use a 6.8 mm drill bit. For a finer M8 x 1 thread, a 7 mm drill bit is recommended.
- Why does the drill bit size vary for different M8 threads? Different thread pitches require different hole sizes to allow proper thread engagement and prevent damage. Finer threads need slightly larger holes.
- How do I choose the right drill bit material for M8 screws? Select a drill bit material that matches your workpiece, such as high-speed steel for wood and softer metals or cobalt for harder metals.
- Can I use the same drill bit size for tapping and clearance holes for M8 screws? No, tapping holes require slightly smaller drill bits than clearance holes. The sizes vary based on thread pitch and application.