Loctite 660 Quick Metal High Strength Retaining Compound 6ml

Loctite 660 Quick Metal is a one-component, metallic grey, high strength anaerobic retaining paste. It is a urethane methacrylate that needs no mixing and does not fluoresce.

It is used to restore correct fits on worn shafts, spun bearings and damaged keyways. Henkel designed it for cylindrical fitting parts where bond gaps can approach 0.50 mm, and notes excellent gap cure.

Where this product is used

• Restoring correct fits on worn shafts
• Spun bearings
• Damaged keyways
• Cylindrical fitting parts where bond gaps can approach 0.50 mm

Features

• High strength: at least 17.2 N/mm² compressive shear on steel pins and collars after 24 hours at 22 °C
• Designed for bond gaps that can approach 0.50 mm, with excellent gap cure
• Metallic grey paste; does not fluoresce
• One component, no mixing
• Anaerobic cure, with activator as the secondary cure
• Hot strength tested from -50 to 150 °C; heat ageing tested at 120 and 150 °C

Key specifications

Available sizes

Selecting the right option

Loctite 660 is a paste for worn or loose fits with larger gaps. For close-fitting cylindrical parts see Loctite 680 High Strength Retaining Compound 50ml or Loctite 648 High Strength, High Temperature Retaining Compound 50ml, both high strength liquids, or Loctite 641 Retaining Compound for medium strength.

Henkel recommends Activator SF 7471 or SF 7649 on inactive metals, where cure is slow or where gaps are large: see Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g and Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.

Using it

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

To disassemble, apply localised heat to approximately 250 °C and take the parts apart while hot. Clean up by soaking in Loctite solvent and using a wire brush.

Storage and handling

Store unopened in a dry location, optimally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidisers. Not recommended on plastics, particularly thermoplastics that may stress-crack. Check compatibility with aqueous washing systems.

Frequently asked questions

What is the shear strength of Loctite 660?

At least 17.2 N/mm² compressive shear on steel pins and collars after 24 hours at 22 °C (ISO 10123).

What gap can Loctite 660 fill?

It is designed for cylindrical parts where bond gaps can approach 0.50 mm. Henkel notes excellent gap cure.

How do you dismantle parts retained with Loctite 660?

Apply localised heat to approximately 250 °C and disassemble while hot.

Do I need an activator with Loctite 660?

Use Loctite SF 7471 or SF 7649 activator on inactive metals, where cure is too slow or the gap is large.

Is Loctite 660 suitable for food plants?

It is registered to NSF Category P1 for use as a sealant where there is no possibility of food contact in and around food processing areas. Henkel describes this as a regional approval.

How long until I can handle parts retained with Loctite 660?

Henkel gives no fixture time. Do not disturb the assembly until sufficient handling strength is achieved; the cure-speed graphs are in the data sheet.

Related products

See also: Loctite 641 Retaining Compound, Loctite 680 High Strength Retaining Compound 50ml, Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g, Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.