Loctite 620 High Temperature Retaining Compound 10ml

Loctite 620 is a green, high-viscosity, medium to high strength anaerobic retaining compound for bonding cylindrical fitting parts. It is a methacrylate ester that cures in the absence of air, confined between close-fitting metal surfaces.

Henkel describes it as offering higher temperature performance and as particularly suited to bond gaps that can approach 0.2 mm. Typical uses are locating pins in radiator assemblies, bearings in automatic transmissions, and bushings and sleeves in housings and on shafts.

Where this product is used

• Locating pins in radiator assemblies
• Bearings in automatic transmissions
• Bushings and sleeves into housings and on shafts
• Cylindrical fitting parts where bond gaps can approach 0.2 mm
• Assemblies that need higher temperature performance than a general retaining compound

Features

• Medium to high strength
• High viscosity: 8,500 mPa·s (Brookfield RVT, 25 °C)
• Anaerobic cure, with Activator SF 7471 or SF 7649 as the secondary cure
• Shear strength rises from 17 to 24 N/mm² after a further 24 hours at 177 °C
• Suited to bond gaps that can approach 0.2 mm
• Green liquid
• Removable with standard hand tools, or by heating to approximately 300 °C

Key specifications

Selecting the right option

The 50ml pack is Loctite 620 High Temperature Retaining Compound 50ml. For other retaining compounds see Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml and Loctite 609 Cylindrical Bonding Retaining Compound.

Using it

Henkel names Activator SF 7471 or SF 7649 as the secondary cure.

Cure speed is shown in graphs in the Henkel data sheet and depends on the materials, the gap and the temperature. Do not disturb the parts until sufficient handling strength is achieved.

To disassemble, use standard hand tools, or apply localised heat to approximately 300 °C and disassemble while hot.

Storage and handling

Store unopened in a dry location, with optimal storage at 8 °C to 21 °C. Storage below 8 °C or above 28 °C can adversely affect properties.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Not normally recommended for plastics, where thermoplastics may stress crack. Read the safety data sheet before use.

Frequently asked questions

How strong is Loctite 620?

Compressive shear strength on steel pins and collars (ISO 10123) is 17 N/mm² after 24 hours at 23 °C, and 24 N/mm² after a further 24 hours at 177 °C.

What bond gap suits Loctite 620?

Henkel describes it as designed for cylindrical fitting parts, particularly where bond gaps can approach 0.2 mm.

What temperature can Loctite 620 take?

Henkel states no service temperature range. Hot strength is tested from 0 to 250 °C and heat ageing at 120, 150 and 180 °C; the graphs are in the data sheet.

How do I disassemble parts retained with Loctite 620?

Use standard hand tools, or apply localised heat to approximately 300 °C and disassemble while hot.

Do I need an activator with Loctite 620?

Henkel names Activator SF 7471 and SF 7649 as the secondary cure.

Does Loctite 620 carry any approvals?

The current Henkel data sheet lists no approvals. Contact AIMS if you need a certificate for a specific application.

Related products

See also: Loctite 620 High Temperature Retaining Compound 50ml, Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml, Loctite 609 Cylindrical Bonding Retaining Compound, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g.