LOCTITE® 577
Features and Benefits
Medium strength, thixotropic, general purpose thread sealant for straight-to-straight and straight-to-taper threaded fittings. Fills the space between threaded parts and seals and locks at the same time.
When you need a general purpose thread sealant with high temperature- and contamination-tolerance, as well as effectiveness on inactive and active metals, choose LOCTITE® 577. Designed for the locking and sealing of threaded metal pipes and fittings, this product provides an instant, low-pressure seal and won't creep, shrink or shred. Perfect for use on stainless steel without the need for surface activation, it offers gap performance to 0.25 mm (0.01") and will cure even in the presence of minor surface contaminations from cutting, lubrication, anti-corrosion and protection fluids, or cleaners containing surfactants and corrosion inhibitors. Meets the performance requirements of KIWA GASTEC QA AR 214 for admixtures up to and including 100 % hydrogen gas – certifications are available in select countries.
- Excellent chemical resistance
- Medium strength for ease of disassembly
- Cures on active and inactive metals
- Registered to NSF Category P1
- DVGW Approval (EN 751-1): DVGW Reg. No. NG-5146CQ0312
- KIWA GASTEC QA AR 214 certified for hydrogen gas systems
Documents and Downloads
Looking for a TDS or SDS in another language?
Technical Information
| Agency approvals / certificates / specifications | DVGW, NSF, WRAS |
| Application method | Dispense system, Manual |
| Applications | Pipe sealing, Thread sealing |
| Breakaway torque, Steel M10 | 33.0 N·m (295.0 in./lb. ) |
| Color | Yellow |
| Cure type | Anaerobic cure |
| Key characteristics | Chemical resistant, Fluorescent, General purpose, Immediate low pressure sealing, Strength: medium strength, Surface contamination-tolerant, Temperature: high temperature, Thixotropic |
| Operating temperature | -55.0 - 150.0 °C (-65.0 - 300.0 °F ) |
| Physical form | Paste |
| Recommended for use with | Metal, Metal: passive metal, Thread type: tapered |
| Viscosity, 20 RPM | 25000.0 mPa·s |
How to
Step by Step Guide
1. Preparation
Cleaning - It is recommended to use LOCTITE® SF 7063/7064/7070 to degrease and clean surfaces prior to applying adhesive. Activation - If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), apply activator LOCTITE® SF 7240 or LOCTITE® SF 7649 (see cure speed vs activator graph in the TDS). Allow to dry.
2. Application
Apply a 360° bead to the leading male thread, leaving the first thread free. For bigger threads, apply both on male and female threads. For manual dispensing the use of a peristaltic handgun is recommended to ensure a consistent application volume.
3. Assembly
Assemble fittings using wrench tightening in accordance with manufacturers' recommendations.
4. Disassembly
Disassemble with standard hand tools. If not possible, apply localized heat to approximately 500°F/260°C; disassemble parts while hot. For corroded or seized parts use LOCTITE® LB 8040 Freeze and Release.
Frequently Asked Questions
What temperatures can threadlockers/thread sealants/gasketing materials work up to?
Are threadlockers/sealants/gasketing materials resistant to gasoline, diesel, engine oil, water, glycol, acids, alkalis, hydraulic fluid, etc.?
Which products are food / drinking water approved?
Which products can be used on metals/plastics?
Which thread sealants can be used on oxygen systems?
What health and safety (H&S) precautions do I need to take with product "X"?
LOCTITE® 577
Medium strength, thixotropic, general purpose thread sealant for straight-to-straight and straight-to-taper threaded fittings. Fills the space between threaded parts and seals and locks at the same time.