Loctite 620 - Retaining Compound - 50 ml

LOCTITE® 620 is a high-strength, high-temperature-resistant anaerobic retaining compound designed for bonding cylindrical metal components. It is particularly suitable for slip-fit and close-fitting assemblies where high strength, gap filling and elevated-temperature resistance are required. 

LOCTITE 620 cures when confined between close-fitting metal surfaces in the absence of air. Once cured, it helps prevent loosening, leakage and movement caused by vibration, shock and thermal cycling. It is commonly used for retaining bushings, sleeves, bearings, locating pins, shafts, gears and pulleys. �

Henkel Datasheets

Key Features

High-strength retaining compound

High-temperature resistance

Green, one-component liquid

Anaerobic curing technology

Designed for cylindrical metal assemblies

Suitable for slip-fit and close-fitting parts

Gap filling capability of approximately 0.15–0.25 mm

Helps prevent loosening and leakage caused by vibration and shock

Operating temperature range of approximately -55°C to 230°C

Typical fixture time: approximately 60 minutes

High viscosity formulation, approximately 8,000 mPa·s

Typical steel shear strength: approximately 26 N/mm² (3,800 psi) 

Typical Applications

LOCTITE 620 is suitable for applications such as:

Retaining bearings in housings

Securing bushings and sleeves

Bonding locating pins

Retaining shafts and gears

Securing pulleys

Pump housings

Automotive transmission components

Radiator assemblies

Electric motors

Industrial machinery and equipment

Fluid-processing and power-generation equipment 

How LOCTITE 620 Works

The adhesive is applied to the cylindrical mating surfaces before assembly. When the parts are fitted together, the product becomes confined between the metal surfaces and, in the absence of air, undergoes an anaerobic curing reaction. The cured adhesive forms a strong bond between the components, helping improve resistance to movement, vibration and leakage.

Its relatively high viscosity also allows LOCTITE 620 to accommodate larger assembly gaps than many conventional retaining compounds. 

Technical Specifications

Property

LOCTITE 620

Product type: Retaining compound

Technology: Anaerobic acrylic

Chemical type: Methacrylate ester

Colour: Green

Components: 1-part

Cure type: Anaerobic

Strength: Medium to high

Viscosity: Approx. 8,000 mPa·s

Gap fill: 0.15–0.25 mm

Fixture time: Approx. 60 minutes

Operating temperature: -55°C to 230°C

Steel shear strength: Approx. 26 N/mm²

Application: Retaining cylindrical metal parts

Henkel identifies LOCTITE 620 specifically for high-temperature retaining applications and lists steel as the recommended metal substrate.