Henkel LOCTITE-638 (10ml-Btl)

Additional Product Information

Overview

LOCTITE 638 is a high-strength retaining adhesive designed for cylindrical fitting parts, particularly in aviation and MRO environments where reliability is critical. It provides maximum strength at room temperature, ensuring assemblies remain secure under shock, vibration, and thermal stress. Maintenance and engineering teams rely on it for its robust curing performance, ease of application, and versatility across a wide range of metal substrates.

Key Technical Specs for LOCTITE 638

• Type: Acrylic Retaining Adhesive
• Size/Volume: Available in multiple industrial container sizes
• Color: Green (uncured)
• Viscosity/Consistency: High viscosity, Brookfield 2,000 3,000 mPa s (cP)
• Cure/Working Time: Anaerobic cure; accelerated with activator; full strength in 24 72 hours depending on substrate
• Tensile/Peel Strength: Compressive shear strength on steel: ?29 N/mm (4,200 psi) after 7 days
• Shore Hardness: Not specified; adheres as a high-strength bonding layer
• Service Temperature: -75 C to 200 C (-100 F to 392 F)
• Typical Uses: Locking bushings, sleeves, collars, shafts, press-fitted and slip-fitted assemblies
• Shelf Life: Store 8 21 C (46 70 F) in unopened container; avoid contamination and extreme temperatures

Approvals & Specifications

• NSF International Registered, Category P1 (non-food-contact areas, regional approval)
• Meets Henkel internal quality and performance standards
• Suitable for industrial and aerospace maintenance applications

Typical Aircraft MRO / AOG Applications

• Securing bearings, bushings, and sleeves in landing gear assemblies
• Locking shafts and collars in avionics or engine components
• Maintaining integrity of press-fit and slip-fit components under vibration
• Temporary or long-term retention of MRO parts during aircraft repair

Compatibility & Safety Notes

• Substrate Compatibility: Mild steel, stainless steel, plated metals; not recommended for most plastics or thermoplastics
• PPE: Gloves and eye protection recommended during handling
• Handling Notes: Clean surfaces with LOCTITE solvent before bonding; avoid oxygen-rich systems and strong oxidizers

Packaging & Procurement

• Available in industrial tube, bottle, and bulk pack sizes
• Store in a cool, dry location; optimal 8 21 C (46 70 F)
• Easy to dispense; one-component formula requires no mixing

Why LOCTITE 638 is Chosen for AOG / MRO

• Fast, reliable bonding with high retention even in tight gaps
• Versatile on multiple metal substrates, tolerant to oils and contamination
• Portable and easy to apply in field maintenance or hangar settings

Practical Suggestions for Your Team (AOG Mindset)

• Stock standard container sizes to minimize downtime
• Train technicians on proper surface prep and activator use for faster curing
• Maintain clean application tools to prevent contamination and ensure consistent performance

Manufacture / Aviation Spec Codes

• Manufacturer: Henkel Corporation
• Product ID: LOCTITE 638
• Applicable MIL/OEM/Export Codes: Refer to Henkel Technical Data Sheet for batch-specific codes

Alternative Names & Descriptions

• Henkel 638 Retaining Adhesive
• LOCTITE 638 High Strength Retainer
• Acrylic Retaining Compound 638
• LOCTITE 638 Cylindrical Fitting Adhesive
• Henkel LOCTITE 638 Industrial Retainer