What causes screwdriver bits to strip screws?

Screwdriver bits strip screws mainly because of poor bit fit, the wrong bit size, excessive torque, low tip accuracy, or improper driving angle.

Common causes include:

Wrong bit size: a bit that is too small or too large cannot fully engage the screw recess

Incorrect bit profile: Phillips, JIS, Torx, Pentalobe, Tri-point, and other profiles are not interchangeable

Poor tip machining: inaccurate geometry creates limited contact and increases slipping

Excessive torque: too much torque can deform or round the screw head

Insufficient downward pressure: the bit can climb out of the screw recess during tightening

Driving at an angle: side loading reduces contact area and increases cam-out

Worn screwdriver bit: rounded or damaged edges cannot transfer torque properly

Low-quality screw: soft screw material can deform even when the correct bit is used

High speed on small screws: excessive RPM can reduce control and increase slipping

Repeated installation and removal: already worn screw heads are easier to strip

For precision electronics repair, correct fit and tip accuracy are more important than simply using a harder bit. A very hard bit with poor geometry can still damage the screw.

For ToolQeen precision screwdriver projects, we recommend controlling the bit profile, dimensions, hardness, torque, runout, and actual screw fit together before mass production.

ToolQeen can customize S2 or CR-V bit profiles, hardness, lengths, torque settings, and set configurations according to the target screws and repair application.