Loctite 609 - Retaining Compound - 50ml

LOCTITE® 609 is a one-component, high-strength, general-purpose anaerobic retaining compound designed for bonding close-fitting cylindrical metal parts. It is particularly suitable for locking bushings and sleeves in housings or on shafts, augmenting press fits, and securing cylindrical assemblies. 

LOCTITE 609 is a low-viscosity green liquid that cures when confined between close-fitting metal surfaces in the absence of air. Once cured, it creates a high-strength bond that helps prevent movement and provides corrosion protection within the joint. 

Key Features and Benefits

High-strength retaining compound

Green colour

One-component formulation — no mixing required

Anaerobic curing technology

Low viscosity: approximately 120 mPa·s (cP)

Designed for close-fitting cylindrical metal parts

Helps augment conventional press fits

Suitable for bushings, sleeves, shafts and hubs

Gap filling capability up to 0.15 mm

Fixture time of approximately 15 minutes

Operating temperature: -55°C to +150°C

Fluorescent under UV light for quality-control inspection

High shear strength on steel: approximately 15.8 N/mm²

Suitable for manual or dispensing-system application. 

Typical Applications

LOCTITE 609 is suitable for:

Locking bushings and sleeves

Securing components onto shafts

Augmenting press-fit assemblies

Bonding close-fitting cylindrical parts

Rotor-to-shaft assemblies

Electric motors

Pumps and rotating equipment

Industrial machinery

Automotive applications

Maintenance and repair of cylindrical assemblies

Henkel specifically identifies rotor-to-shaft assemblies in fractional and sub-fractional horsepower motors as a typical applications 

How LOCTITE 609 Works

LOCTITE 609 is applied to the mating cylindrical surfaces before assembly. When the adhesive becomes confined between the metal surfaces and oxygen is excluded, the anaerobic curing process begins.

The cured material fills the small clearance between the components, creating a strong bond across the cylindrical interface. This can help reduce movement between components and improve the reliability of assemblies that otherwise depend primarily on a mechanical press fit.

Suitable Materials

LOCTITE 609 is recommended for metal cylindrical assemblies. It is particularly suited to close-fitting metal components such as shafts, bushings, sleeves and housings. 

Technical Specifications

Property: LOCTITE 609

Product type: Retaining compound

Strength: High

Colour: Green

Technology: Acrylates

Cure: Anaerobic

Viscosity: Approx. 120 mPa·s (cP)

Fixture time: Approx. 15 minutes

Gap fill: Up to 0.15 mm

Shear strength on steel: Approx. 15.8 N/mm²

Operating temperature: -55°C to +150°C

Physical form: Liquid

Recommended substrate: Metal

UV fluorescence: Yes

Application: Close-fitting cylindrical parts

These values are based on Henkel's published LOCTITE 609 product information. 

Surface Preparation

For best performance, mating surfaces should be clean, dry and free from excessive oil, grease and other contamination. The adhesive can be applied manually or using suitable dispensing equipment. On less-active metal surfaces, an appropriate activator may be considered where faster or more reliable curing is required.

LOCTITE 609 for Press-Fit Assemblies

A key application for LOCTITE 609 is augmenting press fits. The retaining compound fills the small clearance between mating cylindrical surfaces and provides additional retention after curing.

This makes it useful when a shaft, bush, sleeve or similar component requires additional security beyond the mechanical interference fit.