[TOOLMENT] Why do my screws always get stripped? (The Physics of Contact)

[TOOLMENT] Why do my screws always get stripped? (The Physics of Contact)

"Stripping" a screw occurs through a phenomenon called Cam-out. This happens when the torque applied to the screwdriver exceeds the "Frictional Force" holding the bit in the screw head, causing the bit to slide up and out, grinding the metal away. This is usually caused by using the wrong Bit Geometry or poor-quality steel that flexes under pressure.

At TOOLMENT, we provide "Precision-Milled" bits that maximize Surface Contact. The more "teeth" of the bit that touch the screw, the less chance of a slip.

Pro-Steps for a Perfect Drive:

  1. Match the "Type": Never use a "Phillips" bit for a "Pozidriv" screw (common in furniture). They look similar, but the angles are different, leading to instant stripping.

  2. The "Push-to-Turn" Ratio: You should apply 70% of your effort into pushing the tool into the screw, and only 30% into turning it. This "Axial Pressure" is what prevents cam-out.

  3. Check for "Wobble": If the bit doesn't sit perfectly snug in the screw head before you start turning, it’s the wrong size.

Bit Type Visual Cue Best For
Phillips (PH) Simple Cross General US projects
Pozidriv (PZ) Cross + "Tick" marks European furniture (IKEA)
Torx (Star) 6-Point Star Best for high torque / No stripping

 

Use Case: This is essential for new homeowners assembling flat-pack furniture. Using a "Precision Fit" bit instead of a generic one ensures you don't ruin a beautiful piece of furniture with a stripped screw that can never be tightened or removed.

Back to blog