Medium-strength retaining compound for bearings and parts that need regular servicing. Fixtures in about 20 minutes on steel and fills diametrical gaps up to 0.15 mm. Stops loosening and leakage from shock and vibration, rated -55°C to +150°C. Loctite 641 is a yellow anaerobic retaining compound for bonding cylindrical parts, such as bearings onto shafts and into housings, with slip, press or shrink fits. To disassemble, apply local heat to about 250°C and dismantle while hot. Product: Loctite 641 Medium Strength Retaining Compound. Size: 10 ml, 50 ml, 250 ml. Technology: acrylic, anaerobic. Chemical type: methacrylate ester. Appearance: yellow liquid. Strength: medium. Viscosity (Brookfield RVT, 25°C, 20 rpm): 400–800 mPa·s. Compressive shear strength (steel pins and collars, ISO 10123): ≥6.5 N/mm². Fixture time: 20 minutes. Gap fill: 0.15 mm. Operating temperature: -55°C to +150°C. Secondary cure: activator. Storage: 8°C to 21°C, dry. Consult the Safety Data Sheet before use. At a glance Type Medium Strength Retaining Compound Cure Anaerobic Fixture Time 20 min Temperature Range -55°C to +150°C Gap Fill 0.15 mm Bearings on shafts — retention where regular dismantling is needed Bearings in housings — holding outer races in bores Gears, pulleys and couplings — serviceable cylindrical fits Pumps and gearboxes — parts that come apart at overhaul Full specifications, applications, features and important limits are in the tabs below. Frequently Asked Questions — Loctite 641 Retaining Compound 10ml What is Loctite 641 Retaining Compound used for? Bearings on shafts — retention where regular dismantling is needed What temperature range does Loctite 641 Retaining Compound handle? Loctite 641 Retaining Compound is rated for -55°C to +150°C. How long does Loctite 641 Retaining Compound take to fixture? Fixture Time is 20 min. What strength or type is Loctite 641 Retaining Compound? Loctite 641 Retaining Compound is a medium strength retaining compound.
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