Retaining Compound - high strength. General purpose. Fast curing.

LOCTITE® 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 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.

Your Benefits

  • 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

Technical Data Sheets (TDS)

Loctite 638 (Loctite 638)

Product information

IDH# Item Name Size
Case Quantity
Safety Data Sheets
1835925 1835925 LOCTITE 638 Retaining Compound
250 ml bottle
10 / case
1835936 1835936 LOCTITE 638 Retaining Compound
50 ml bottle
10 / case
1835937 1835937 LOCTITE 638 Retaining Compound
10 ml bottle
10 / case
1839524 1839524 LOCTITE 638 Retaining Compound
1 l bottle
1 / case