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Green liquid retaining compound in a white 8.5 fl oz bottle with red cap

Loctite

Loctite 1835925 Retaining Compound 638 Series Green 8.5 fl oz

SKU CH-S4W9-64F25

High-strength green retaining compound for steel fills gaps up to .01 in and withstands temperatures from -65 to 355 Degrees F

  • High-strength bond for steel parts up to 4,200 psi
  • Fills gaps up to .01 in for loose-fitting assemblies
  • Withstands temperatures from -65 to 355 Degrees F
  • Full cure in 1 day with 4 min working time
  • Green urethane methacrylate formula meets 29 CFR 1910.1200

High-Strength Retaining Compound 638 Series

Loctite 1835925 is a green urethane methacrylate liquid designed for bonding cylindrical steel assemblies. It targets maintenance and repair operations where loose-fitting parts require a durable, high-strength bond. The 8.5 fl oz bottle suits workshop or field use.

Practical Limits of Gap Fill and Cure

The compound fills gaps up to 0.01 in and demands a primer for reliable adhesion on passive surfaces. Working time is 4 min before fixture strength develops, and full cure requires 1 day at room temperature. Service temperatures range from -65 to 355 Degrees F, defining the thermal envelope for the joint.

Upgrade from Press Fits or Lower-Grade Adhesives

This product replaces mechanical press fits, shrink fits or medium-strength threadlockers when shear loads approach 4,200 psi. The jump is justified when disassembly must remain possible with heat and hand tools, yet the assembly must resist vibration, shock and thermal cycling without loosening. It is not for buyers who need instant fixture strength or anaerobic curing without primer.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $171.99
Pricier than about 91% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

Should I pick the 8.5 fl oz bottle or a different size for a typical repair?

The listing only offers the 8.5 fl oz bottle in the 638 series; choose this size if the volume matches your expected usage.

What does the 4,200 psi shear strength mean when the compound is cured on steel?

It indicates the bonded joint can withstand a shear load of 4,200 psi after full cure, suitable for high-strength retention of cylindrical assemblies.

How does the 0.01 in maximum gap fill limit the parts I can bond?

The adhesive is designed for gaps up to 0.01 in; larger clearances will not be filled reliably and may result in insufficient bond strength.

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