LOCTITE® 641 is a medium-strength retaining compound designed for bonding cylindrical fitting parts, especially where regular servicing or disassembly is required.
Colour: Yellow
Viscosity: approximately 600 mPa·s at 25 °C
Operating temperature range: –55 °C to +150 °C
Shear strength (steel): ~12 N/mm² after cure
Maximum diametral clearance: ~0.1 mm
Primary Chemistry:
Methacrylate ester
LOCTITE® 641 is formulated to secure bushings, bearings, speedi-sleeves, collars and similar close-fitting cylindrical metal parts while permitting future disassembly. Its one-component anaerobic chemistry cures when confined between metal surfaces in the absence of air and forms a tough polymer film that resists movement, fretting and vibration. The medium-strength bond ensures the part remains fixed in service yet can be removed with standard tools during maintenance. Operating reliably in temperatures ranging from –55 °C to +150 °C, this compound supports engineered fits where precision and serviceability are both crucial.
Colour: Yellow
Viscosity: approximately 600 mPa·s at 25 °C
Operating temperature range: –55 °C to +150 °C
Shear strength (steel): ~12 N/mm² after cure
Maximum diametral clearance: ~0.1 mm
Primary Chemistry:
Methacrylate ester
Eliminates movement, slip or fretting between cylindrical assembled parts which can lead to premature failure.
Removes the need for mechanical fasteners such as keys or pins, simplifying assembly and lowering inventory.
Reduces risk of improper fits or tolerances causing component wear or vibration problems.
Enables parts to be serviced and replaced without damage, thereby prolonging equipment life.
Improves system reliability by delivering consistent bonding performance in demanding applications.
LOCTITE® 641 should be applied to clean, dry metal surfaces before assembly of cylindrical parts. Once assembled, the compound cures anaerobically to lock parts in place. This retaining compound is ideally suited for parts that require secure retention but eventual servicing such as bearings on shafts, housings, couplings and more. Where the use of inactive or plated metals may slow cure, use of a Henkel activator is recommended to accelerate the bond.
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