LOCTITE® 577

Features and Benefits

Medium-strength, general purpose thread sealant for straight/straight and straight/taper threads and 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 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
  • Easy to apply
  • Instant low pressure seal
  • Suitable for all metals
  • Locks connection against vibration-induced loosening and other stresses
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Documents and Downloads

Safety Data Sheets and RoHs
2068187 en-NG
IDH: 2068187
EAN: 5010266011943

Size Case: Tottle

Quantity: 10.0/case

2068204 en-NG
IDH: 2068204
EAN: 5010266011981

Size Case: Bag in Box

Quantity: 1.0/case

No documents found

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. )
Colour 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 to degrease and clean surfaces prior to applying adhesive. If cure speed is too slow due to passive metals (stainless steel, aluminium 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).

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 localised heat to approximately 250°C; disassemble while hot. For corroded or seized parts use LOCTITE® LB 8040 Freeze and Release.

Frequently Asked Questions