Loctite 577 vs Loctite 574
Thread sealant for pipes and fittings vs gasketing sealant for rigid flanges.
// Key differences
- Application: 577 seals threaded pipe joints; 574 forms gaskets between machined flanges.
- 577 replaces PTFE tape and hemp; 574 replaces cut paper/fibre gaskets.
Choose Loctite 577 for:
Metal pipe threads, hydraulic and pneumatic fittings.
Choose Loctite 574 for:
Rigid machined flanges (gearbox and pump housings).
Full specification comparison
| Parameter | Loctite 577 | Loctite 574 |
|---|---|---|
| Manufacturer | Henkel (LOCTITE) | Henkel |
| Category | Sealants & Gaskets | Sealants & Gaskets |
| Temperature range | -55°C … +150°C | -55°C … +150°C |
| Standards / approvals | DVGW, WRAS | NSF / ANSI 61 |
| Chemistry | Dimethacrylate ester (anaerobic) | Anaerobic acrylic |
| Operating temperature | -55°C … +150°C | -55°C … +150°C |
| Max thread | 3" | — |
| Fixture time | 10–30 min | — |
| Viscosity | Thixotropic paste | — |
| Specification | DVGW, WRAS | — |
| Cure | — | Anaerobic, metal contact |
| Compliance | — | NSF / ANSI 61 |
| TDS & quote | TDS & quote |
Data compiled from manufacturer data sheets — confirm critical values with the official TDS.
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