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LOCTITE 620 High Temperature Retaining Compound

Features and Benefits

Available sizes:

LOCTITE 620 is a high strength, high temperature resistant retaining compound.
LOCTITE® 620 is a retaining compound designed for the bonding of cylindrical fitting parts. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. Typical applications include locating pins in radiator assemblies, sleeves in pump housings and bearings in auto transmissions. Particularly suitable for applications where temperature resistance up to 200°C is required.
  • Ideal for retaining pins in radiator assemblies, sleeves in pump housings and bearings in auto transmissions
  • High temperature resistance
  • DVGW approval (EN 751-1): NG-5146AR0622
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Technical Information

Agency Approvals / Certificates / Specifications DVGW (EN 751-1): NG-5146AR0622
Application Method Dispense System, Manual
Applications For High Temperature Applications, For Slip Fitted Parts, Retaining
Color Green
Cure Type Anaerobic Cure
Fixture Time 60.0 min.
Gap Fill 0.15 - 0.25 mm
Key Characteristics Cure Speed: Slow Cure, Gap Filling, Strength: Medium to High Strength, Temperature: High Temperature, Viscosity: High Viscosity
Operating Temperature -55.0 - 230.0 °C (-65.0 - 450.0 °F )
Physical Form Liquid
Shear Strength, Steel 26.0 N/mm² (3800.0 psi )
Substrates Metal: Steel
Technology Acrylic
Viscosity 8000.0 mPa·s (cP)

How to

Step by Step Guide

1. Preparation - Cleaning

Use LOCTITE® 790™ for easier removal of old retaining adhesive residue. It is recommended to use LOCTITE® 7070™ to degrease and clean surfaces prior to applying the adhesive. For gaps larger than 0.5mm or worn out shafts, bearing seats or keyways, use LOCTITE® metal-filled compounds or LOCTITE® 660 Retaining Compound.

2. Preparation - Activation

If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use LOCTITE® SF 7649™ activator. Allow to dry.

3a. Application - For Slip-Fitted Assemblies

Apply adhesive around the leading edge of the male component and the inside of the female component and use a rotating motion during assembly to ensure good coverage. Wipe off excess adhesive.

3b. Application - For Press-Fitted Assemblies

Apply 360 degree beads of adhesive to both bond surfaces at the leading edges of insertion or engagement, and assemble at high press-on rates.  Wipe off excess adhesive.

3c. Application - For Shrink-Fitted Assemblies

Apply the adhesive onto the male component; heat the female component to cause expansion for free assembly.  Assemble components and allow temperatures to equilibrate. Wipe of excess adhesive.


For manual assembly of adhesive the use of the LOCTITE® Pro Pump or LOCTITE® Peristaltic Hand Pump is recommended to ensure a consistent application volume. For semi-automatic or fully-automated dispensing options contact our technical service team for advice.


Apply localized heat to approximately 500°F/260°C; disassemble while parts are hot. For corroded or seized parts, use LOCTITE® 8040™ Freeze and Release.

Frequently Asked Questions