LOCTITE 638 Retaining Compound

Features & Benefits

# LOCTITE® 638 **High-strength, general purpose bonding of cylindrical parts** A 1-part, designed for bonding cylindrical fitting parts, particularly with narrow bond gaps up to 0.25 mm (0.01"). Great for a fast cure on all metals, including passive substrates like stainless steel. ## Technical documents and more Safety (2) RoHS (1) **Marketing materials** ## Information 1. Description 2. Technical specification 3. Question & answer For a retaining compound offering high-strength on all metals, including passive substrates, try LOCTITE® 638. You can expect high temperature performance and good oil tolerance, a fixture time of just four minutes, and gap fill of 0.15 mm to 0.25 mm (0.006" to 0.01"). It even tolerates minor surface contaminants, including industrial oils. A high viscosity product, it’s ideal for shafts, gears, pulleys, and similar cylindrical parts, and can also be used for high-strength threadlocking and thread sealing applications. Operating temperature is -55°C to 180°C (-65°F to 355°F). LOCTITE 638 meets the performance requirements of KIWA GASTEC QA AR 214 for admixtures up to and including 100% hydrogen gas on metal threaded fittings – certifications are available in select countries. - 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 - KIWA GASTEC QA AR 214 certified for hydrogen gas systems - **Product category:** - Retaining compounds - Acrylates, anaerobic cure - **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 mm - 0.25 mm - **Key characteristics:** - Fluorescent; Oil tolerant; Strength: high strength; Temperature resistant; Viscosity: high viscosity - **Operating temperature:** - -55.0 °C - 180.0 °C (-65.0 °F - 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) #### Can I apply retaining compounds directly onto machined/as-received parts? - **$75.02** ## Recently viewed products **Water based adhesives** High-performance labeling adhesive for glass containers

Technical Specifications