Loctite 620 High Temperature Retaining Compound 50ml

Loctite 620 is a green, anaerobic retaining compound with a high viscosity and a medium to high strength class. It is a methacrylate ester for bonding cylindrical fitting parts, and it cures between close-fitting metal surfaces without air.

Henkel says it offers higher temperature performance, and that it suits bond gaps that can approach 0.2 mm where maximum strength at room temperature is required. 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 with bond gaps that can approach 0.2 mm
• Assemblies that suit a higher temperature retaining compound

Features

• Medium to high strength
• High viscosity: 8,500 mPa·s (Brookfield RVT, 25 °C)
• 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
• Cure can be accelerated with Activator SF 7471 or SF 7649
• Removable with local heat to approximately 300 °C
• Green liquid

Key specifications

Selecting the right option

The 10ml pack is Loctite 620 High Temperature Retaining Compound 10ml. For other retaining compounds see Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml and Loctite 680 High Strength Retaining Compound 50ml.

Using it

Henkel gives cure speed in graphs only, and it depends on the materials, the gap and the temperature. Do not disturb the parts until sufficient handling strength is achieved.

Activator SF 7471 or SF 7649 can be used to accelerate cure.

To disassemble, apply localised heat to the assembly to approximately 300 °C. The earlier data sheet gave 250 °C, so use the current figure.

Do not return used product to the container.

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. The data sheet gives no shelf life.

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 stress cracking can occur. Check compatibility before use in aqueous washing systems. Read the safety data sheet before use.

Frequently asked questions

How strong is Loctite 620?

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

What bond gap can Loctite 620 handle?

Henkel describes it as suited to bond gaps that can approach 0.2 mm, where maximum strength at room temperature is required.

How do I remove Loctite 620?

Apply localised heat to the assembly to approximately 300 °C and disassemble while hot.

Does Loctite 620 have a stated temperature range?

No. Henkel says it offers higher temperature performance, and shows hot strength from 0 to 250 °C and heat ageing at 120, 150 and 180 °C in graphs. No service range is given.

Which activator suits 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 10ml, Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml, Loctite 680 High Strength Retaining Compound 50ml, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g.