Fasteners

Loctite vs Traditional Fastening Methods

When threadlocking adhesives outperform mechanical locking — and when they don't.

Technical Team · United Flexo Supplies · 18 January 2026

Why threadlockers exist

Vibration loosens conventional fasteners over time. Threadlockers cure anaerobically inside the joint, locking the assembly against rotation.

Loctite 243 (medium strength) suits most reusable assemblies; 270 (high strength) suits permanent fixings; 638 retains cylindrical assemblies.

For very large bolts or where complete disassembly is frequent, a serrated washer or castellated nut may still be the right answer.

Technical Team

United Flexo Supplies