LOCTITE® 638

Features and Benefits

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.
  • Ideal for shafts, gears, pulleys and similar cylindrical parts
  • High strength on all metals, including passive substrates (e.g. stainless steel)
  • High temperature resistance
  • Fluorescent under UV for quality control
  • Hydrogen gas approval for sealing threaded metal fittings according to KIWA GASTEC QA AR 214
  • Tolerates minor contaminants, including industrial oils
  • DVGW Approval (EN 751-1): NG-5146AR0619
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Documents and Downloads

Safety Data Sheets and RoHs
LOCTITE® 638, 250 ml Bottle 1835925 en-CA
IDH: 1835925
EAN: 079340006409

Size Case: Bottle

Quantity: 10.0/case

LOCTITE® 638, 50 ml Bottle 1835936 en-CA
IDH: 1835936
EAN: 079340006393

Size Case: Bottle

Quantity: 10.0/case

LOCTITE® 638, 10 ml Bottle 1835937 en-CA
IDH: 1835937
EAN: 079340006386

Size Case: Bottle

Quantity: 10.0/case

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Technical Information

Agency approvals / certificates / specifications DVGW (EN 751-1): NG-5146AR0619, NSF P1 Reg. No 123010, WRAS (BS 6920): 0511518
Application method Dispense system, Manual
Applications For close fitting cylindrical parts, For slip fitted parts, Retaining
Color Green
Cure type Anaerobic cure
Fixture time 4.0 min.
Gap fill 0.15 - 0.25 mm
Key characteristics Fluorescent, Oil tolerant, Strength: high strength, Temperature resistant, Viscosity: high viscosity
Operating temperature -55.0 - 180.0 °C (-65.0 - 355.0 °F )
Physical form Liquid
Recommended for use with Metal: steel
Shear strength, Steel 31.0 N/mm² (4500.0 psi )
Viscosity 2500.0 mPa·s (cP)