Explore our beta site

Are you an Industrial Manufacturing or Industrial Maintenance and Repair professional? Explore our brand-new beta site for a customized experience. 

Browse Now

LOCTITE 660 High Strength Retaining Compound

Known as Loctite 660 Quick Metal, Press Fit Repair

Features and Benefits

Available sizes:

LOCTITE 660 is a high strength retaining compound with good gap filling properties, ideal for repairing worn-out seats, keys, splines, bearings or tapers without remachining.
LOCTITE® 660 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps occurs without the need for remachining. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. LOCTITE 660 exhibits excellent gap cure characteristics and is also suitable for retaining shims.
  • Ideal for repairing worn parts without remachining
  • Enables re-use of worn bearing seats, keys, splines or tapers
  • Suitable for retaining shims
  • P1 NSF Reg. No.: 123704
Read More

Documents and Downloads

Safety Data Sheets and RoHs
No documents found

Technical Information

Agency approvals / certificates / specifications NSF P1
Application method Manual
Applications Press Fitting, Repairing, Retaining
Color Silver
Cure type Anaerobic Cure
Fixture time 15.0 min.
Gap fill 0.25 - 0.5 mm
Key characteristics Gap Filling, Strength: High Strength, Thixotropic
Operating temperature -65.0 - 300.0 °F (-55.0 - 150.0 °C )
Physical form Paste
Shear strength, Steel 23.0 N/mm² (3335.0 psi )
Substrates Metal: Steel
Viscosity 250000.0 mPa·s (cP)

How to

Step by Step Guide

1. Preparation - Cleaning

Use LOCTITE SF 790 to remove any old adhesive from parts. Use LOCTITE SF 7070 to degrease and clean surfaces prior to applying adhesive. For gaps larger than 0.5mm or worn out shafts, bearing seats or keyways, use LOCTITE metal-filled compounds to rebuild the surfaces.

2. Preparation - Activation

If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use LOCTITE SF 7649 activator. Allow to dry.

3. Application - For Slip-Fitted Assemblies

Apply adhesive around the leading edge of the male component and the inside of the female component. Assemble parts with a rotating motion to ensure good coverage.  Wipe off excess adhesive.

4. Application - For Press-Fitted Assemblies

Apply 360 degree beads of adhesive to both bond surfaces at the leading edges of insertion or engagement, and assemble at high press-on rates.  Wipe off excess adhesive.

5. Application - For Shrink-Fitted Assemblies

Apply the adhesive onto the male component, heat the female component to cause expansion for free assembly. Assemble components and allow temperatures to equiliberiate. Wipe of excess adhesive.

6. Disassembly

Apply localized heat to approximately 500°F/260°C and disassemble while hot.

Frequently Asked Questions