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Loctite 638 - 250 ml (retaining metal cylindrical assemblies)

przykład użycia
Product description:
LOCTITE 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 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. Typical applications include locking bushings and sleeves into housings and on shafts. LOCTITE 638 provides robust curing performance. It not only works on active metals (e.g. mild steel) but also on passive substrates such as stainless steel and plated surfaces. The product offers high temperature performance and oil tolerance. It tolerates minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids. 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. To accelerate cure speed or where large gaps are present, use activator LOCTITE 7649 or LOCTITE 7471 and allow to dry.
3. 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.
4. For Press Fitted Assemblies, apply adhesive thoroughly to both bond surfaces and assemble at high press on rates.
5. For Shrink Fitted Assemblies, the adhesive should be coated onto the part to produce a smooth, even film of material. If heating the hub for assembly, coat the pin. If the pin is to be cooled for assembly, coat the hub. If both heating and cooling is to be done, apply material to cooled part. Avoid condensation on cooled parts.
6. Parts should not be disturbed until sufficient handling strength is achieved.

7. Remove with standard hand tools.
8. If needed, apply localized heat to the assembly to approximately 250 °C. Disassemble while hot.
9. If this temperature is not possible, heat as much as possible and use mechanical aids.

10. Cured product can be removed with a combination of soaking in a LOCTITE 7200 solvent and mechanical abrasion such as a wire brush.

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 stainless steel : 28 N/mm²
  • Time to get full strength (22 °C):
    -Steel : 12 godz.
    -Stainless steel : 24 godz.
    -Aluminum : 72 godz.
  • Time to obtain initial strength (22 °C):
    -Steel : 10 minutes
    -Stainless steel : 30 minutes
    -Aluminum : 60 minutes
  • Working temperature : from -75 °C to +180 °C
  • Color : green

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