Loctite 638 Retaining Compound


Loctite 638 Retaining Compound

Loctite 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 mm. Ideal for use where high dynamic forces or cyclic loading is expected, for eg: shafts, gears, pulleys and cylindrical parts.


  • Prevents loosening: It fills all gaps between the cylindrical components and cures into a hard thermoset plastic. This unitizes the assembly and prevents loosening and leakage from shock and vibration.
  • Works on all metal substrates.
  • Tolerant towards minor surface contaminations.
  • High temperature resistance.
  • High strength on all metals, including passive substrates (e.g. stainless steel).


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