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LOCTITE 638 High Strength Retaining Compound

Features and Benefits

Available in:

  • 250.0 ml bottle


  • 50.0 ml bottle


  • 10.0 ml bottle


LOCTITE 638 is a high strength, fast curing, general purpose retaining compound.
LOCTITE® 638 is designed for the bonding of cylindrical fitting parts, particularly with narrow bond gaps approaching 0.25 mm. 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. It not only works on active metals but also on passive substrates, exhibiting robust cure performance. The product offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants.
  • High temperature resistance
  • Tolerates minor contaminants, including industrial oils
  • High strength on all metals, including passive substrates (e.g. stainless steel)
  • Ideal for shafts, gears, pulleys and similar cylindrical parts
  • P1 NSF Reg. No.: 123010
  • DVGW Approval (EN 751-1): NG-5146AR0619
  • WRAS Approval (BS 6920): 0511518
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Documents and Downloads

Data Sheets
and RoHs
LOCTITE 638 Retaining Compound 1835925 en-US
IDH: 1835925

Size Case: 250.0 ml bottle

Quantity: 10/case

LOCTITE 638 Retaining Compound 1835936 en-US
IDH: 1835936

Size Case: 50.0 ml bottle

Quantity: 10/case

LOCTITE 638 Retaining Compound 1835937 en-US
IDH: 1835937

Size Case: 10.0 ml bottle

Quantity: 10/case

Technical Information

Agency Approvals / Specifications DVGW (EN 751-1): NG-5146AR0619, NSF P1 Reg No: 123010, WRAS (BS 6920): 0511518
Color Green
Diametrical Clearance (Maximum) 0.25 mm
Fixture Time 4 min.
Fixture Time Temperature 39 °F
Full Cure Temperature 77 °F
Gap Fill 0.01 in.
Shear Strength Unit, Steel psi
Shear Strength, Steel 4500
Specific Gravity 1.09 g/l
Specific Gravity Temperature 25 °C
Substrates Metal: Steel
Temperature -65 - 300 °F
Viscosity 2500 mPa.s (cP) Brookfield
Viscosity Temperature 77 °F