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Loctite 243 vs Loctite 270

Medium-strength removable threadlocker vs high-strength permanent threadlocker.

// Key differences

  • Strength: 243 is medium (removable with hand tools); 270 is high (needs heat ~250°C to disassemble).
  • Thread size: 243 suits M6–M20 fasteners that need servicing; 270 targets permanent joints up to M20.
  • Oil tolerance: 243 cures reliably on lightly oiled surfaces; 270 prefers clean parts.

Choose Loctite 243 for:

Fasteners that must be serviced (pumps, gearboxes, covers).

Choose Loctite 270 for:

Permanent studs and bolts exposed to heavy vibration.

Full specification comparison

ParameterLoctite 243Loctite 270
ManufacturerHenkelHenkel (LOCTITE)
CategoryAdhesives & ThreadlockersAdhesives & Threadlockers
Temperature range-55°C … +180°C-55°C … +180°C
Standards / approvalsNSF / ISO 4690DVGW, BAM
ChemistryAnaerobic acrylicDimethacrylate ester (anaerobic)
StrengthMedium, removableHigh
Operating temperature-55°C … +180°C-55°C … +180°C
ComplianceNSF / ISO 4690—
Fixture time—10 min
Viscosity—400–600 mPa·s
Specification—DVGW, BAM
TDS & quoteTDS & quote

Data compiled from manufacturer data sheets — confirm critical values with the official TDS.

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