Machining Applications Views: 38

Absolutely not! A standard twist drill has a 118-120 degree point angle, while metric countersunk screws use 90 degrees - a 28-30 degree mismatch. With a drill-enlarged countersink, the screw head contacts only along the outer edge line, achieving just 20-30% of normal clamping force and loosening after tightening. You must use a dedicated 90-degree countersink or spot facer. Products exported to North America need 82-degree countersinks (US standard). Lihao Technology cobalt HSS 3-flute countersinks deliver precise angles (tolerance within +/-0.5 degrees), smooth cutting and excellent surface quality.