Thread Sealant: LOCTITE 577
LOCTITE 577 is a 1-component, medium-strength, thixotropic thread sealant designed for locking and sealing metal threads, including both straight-to-straight and straight-to-taper metal threads. The product cures anaerobically when confined in the absence of air between close-fitting metal surfaces, providing an instant low-pressure seal and mechanical locking of threaded connections.
Application and Usage
LOCTITE 577 is typically applied as a 360° bead to the leading threads of the external (male) component, keeping the first thread free. The product is pressed into the threads to fill voids; for larger threads or wider gaps, it can also be applied to the internal (female) threads. Assembly and tightening are carried out according to relevant recommendations for fittings. The product provides an immediate seal against moderate pressures; for maximum pressure and solvent resistance, a cure time of at least 24 hours is recommended.
The datasheet also states that LOCTITE 577 can be used on stainless steel without the need for surface activation and that the product is tolerant of minor surface contaminants such as cutting fluids and lubricants. Where the cure speed is too slow or for larger gaps, applying an activator can accelerate the cure.
Typical Applications
- Locking and sealing metal threaded pipes and fittings.
- Application on stainless steel without requiring surface activation (as stated in the manufacturer's documentation).
- Sealing where gap filling up to 0.25 mm is required.
Technical Reference
For detailed technical information and complete datasheet specifications, please refer to the manufacturer's documentation.
Specifications
- Product Name: LOCTITE 577
- Technology: Acrylic
- Chemical Type: Dimethacrylate ester
- Appearance (uncured): Yellow paste
- Components: One component – no mixing required
- Viscosity: High, thixotropic (Brookfield: 100,000 mPa·s at Spindle 6, 2.5 rpm; 24,500 mPa·s at Spindle 6, 20 rpm)
- Curing Mechanism: Anaerobic (secondary curing with activator possible)
- Application: Thread sealing
- Strength: Medium
- Gap Filling Capability: Up to 0.25 mm
- NSF Registered: Category P1 (regional approval, according to manufacturer's documentation)
- Approvals: Australian Gas Association Certificate No. 4787 Class III (specified working pressure 2000 kPa and working temperature -10 to 135°C), as well as EN 751-1 / DVGW mentioned in manufacturer's documentation
- Henkel Reference: Technical Data Sheet LOCTITE 577 (November 2024)
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