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Loctite 620 - 250 ml (retaining metal cylindrical assemblies, to 250 deg. °C)

Product description:
LOCTITE® 620 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.2 mm and where maximum strength at room temperature is required. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. LOCTITE® 620 provides robust curing performance. The product offers higher temperature performance and makes it particularly suited for retaining higher temperature assemblies such as locating pins in radiator assemblies and bearings in auto transmissions. Typical applications include locking bushings and sleeves intohousings and on shafts. Further information on the product can be obtained from your local technical department:

Steps to achieve the best adhesive results:
1. For best results, clean all surfaces (external and internal) with a LOCTITE 7063 cleaning solvent and allow to dry.
2. If the material is an inactive metal or the cure speed is too slow, spray with activator LOCTITE 7471 or LOCTITE 7649 and allow to dry.
3. Shake the product thoroughly before use.
4. For Slip Fitted Assemblies, apply adhesive around the leading edge of the pin and the inside of the collar and use a rotating motion during assembly to ensure good coverage.
5. For Press Fitted Assemblies, apply adhesive thoroughly to both bond surfaces and assemble at high press on rates.
6. For Shrink Fitted Assemblies the adhesive should be coated onto the pin, the collar should then be heated to create sufficient clearance for free assembly.
7. Parts should not be disturbed until sufficient handling strength is achieved.

8. Apply localized heat to the assembly to approximately 250 °C. Disassemble while hot.

9. Cured product can be removed by soaking in a LOCTITE solvent, e.g. LOCTITE 7200 and mechanical removal with a soft scraper. Avoid formation of dust and aerosols. Complete the cleaning process by wiping with a soft cloth dampened with e.g. LOCTITE 7063.

Store product in the unopened container in a dry location. Storage information may be indicated on the product container labeling.
Optimal Storage: 8 °C to 21 °C. Storage below 8 °C or greater than 28 °C can adversely affect product properties.
Material removed from containers may be contaminated during use. Do not return product to the original container.
Henkel Corporation cannot assume responsibility for product which has been contaminated or stored under conditions other than those previously indicated.

  • Shear strength on steel : 27 N/mm²
  • Time to get full strength (22 °C):
    -Steel : 20 hours
    -Zinc dichromate : 20 hours
    -Aluminum : 72 hours
    -With the use of the LOCTITE SF 7649 activator : 2 hours
  • Time to obtain initial strength (22 °C):
    -Steel : 1 hour
    -Zinc dichromate : 6 hours
    -Aluminum : 3 hours
    -With the use of the LOCTITE SF 7649 activator : 10 minutes
  • Working temperature : from -55 °C to +250 °C
  • Color : light green

Full technical information can be found in the technical data sheet.