Cause Analysis and Complete Solutions for Six Major Assembly Defects of Micro Screws

Micro screws from M0.8 to M2.0 are widely used in precision electronic products. Due to tiny size and shallow drive groove, micro screws are extremely sensitive to bit precision, torque value and assembly verticality. Unstandardized process parameters lead to repeated mass production defects. This article summarizes six typical problems and systematic solutions.

1. Cam-Out and Slot Damage

Caused by worn bits, mismatched tools, tilted assembly and excessive torque. Replace bits regularly, reduce torque for stainless steel screws and ensure vertical assembly.

2. Screw Fracture

Excessive torque, undersized holes and residual dust cause screw breaking. Standardize hole size, clean holes and set differentiated torque parameters for different materials.

3. Plastic Housing Cracking

Sharp thread tip and over-tightening force crack plastic parts. Adopt chamfered thread design and low-torque assembly standards for plastic products.

4. Screw Floating and Incomplete Locking

Dust blockage and insufficient stroke lead to virtual locking. Clean holes regularly and calibrate electric screwdriver stroke.

5. Loosening Risk

Insufficient torque and excessive thread clearance cause post-sale loosening. Optimize torque range and apply anti-loosening measures for vibrating positions.

6. Offset and Tilting Locking

Equipment deviation and unstable tools cause inclined locking. Calibrate equipment coaxiality and use high-precision anti-shake bits.