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.
  • Tolerates minor contaminants, including industrial oils
  • High strength on all metals, including passive substrates (e.g. stainless steel)
  • High temperature resistance
  • Ideal for shafts, gears, pulleys and similar cylindrical parts
  • DVGW Approval (EN 751-1): NG-5146AR0619
  • P1 NSF Reg. No.: 123010
  • WRAS Approval (BS 6920): 0511518
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Documents and Downloads

Safety Data Sheets and RoHs
LOCTITE 638, 250ml 1803042 en-GB
IDH: 1803042
EAN: 5010266006437

Size Case: 250 ml Bottle

Quantity: 10.0/case

LOCTITE 638, 50ml 1803365 en-GB
IDH: 1803365
EAN: 5010266006635

Size Case: 50 ml Bottle

Quantity: 12.0/case

LOCTITE 638, 2ltr 1803367 en-GB
IDH: 1803367
EAN: 5010266006505

Size Case: 2 l Bag in Box

Quantity: 1.0/case

LOCTITE 638, 10ml 1918981 en-GB
IDH: 1918981
EAN: 4058093034071

Size Case: 10 ml Bottle

Quantity: 12.0/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
Colour 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
Shear Strength, Steel 31.0 N/mm² (4500.0 psi )
Substrates Metal: Steel
Technology Acrylic
Viscosity 2500.0 mPa·s (cP)

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LOCTITE 638 is a high strength, fast curing, general purpose retaining compound.

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