Loctite low strength threadlocker 50 ml Bottle — Purple, low-viscosity for small screws and removable assemblies

Engineered for small screws and components that require serviceability, this Loctite formula cures into a durable, semi-permanent bond suited to metal assemblies. The fluid has a low viscosity for easy application into threads, sets at room temperature, and tolerates a wide operating range from -65°F to 300°F. Its purple color helps you visually confirm application, and the 50 ml bottle is sized for workshop and industrial maintenance tasks.

How quickly does it set and reach full strength?

The product provides a working time and cure schedule that fits routine maintenance: parts can be fixture-held or repositioned quickly, with full performance reached in about 24 hours at 25°C. Cure begins upon contact between metal surfaces, and temperature and gap size affect cure speed.

• Initial handling (fix) in about 10 minutes at 25°C.
• Functional cure typically around 20 minutes depending on conditions.
• Full cure and mechanical properties by 24 hours at 25°C.
• Performance influenced by material, ambient temperature, and bond gap.

What materials and fastener sizes is it best for?

Loctite 21464 is formulated for metal fasteners and threaded assemblies where a removable bond is needed. Because it is a low-strength threadlocker, it’s suited to small screws, set screws, and components that will require future disassembly without damaging parts.

• Compatible primarily with metal substrates and threaded metal fasteners.
• Ideal for small diameter screws, trim fasteners, and serviceable components.
• Not intended as a structural adhesive for large load-bearing joints.
• Reduces loosening from vibration while allowing hand or tool removal later.

What are the physical properties and handling considerations?

The formulation is a low-viscosity liquid containing polyglycol dimethacrylate and silica that delivers modest tensile and shear strengths while remaining easy to apply. It has a specific gravity near 1.08 and a viscosity rating between 1200 and 5000 cPs, making it flow into threads evenly.

• Viscosity: approximately 1200–5000 cPs for good thread penetration.
• Tensile strength: about 53 psi; shear strength: about 360 psi.
• Operational temperature range: roughly -65°F to 300°F (-54°C to 149°C).
• Low VOC content (~0.67%) and a visible purple tint for application confirmation.

Who is this for? This Loctite 21464 low-strength threadlocker is aimed at technicians, maintenance crews, fabricators, hobbyists, and assembly line operators who need a reliable, removable locking solution for small fasteners. It’s particularly useful where periodic disassembly is required—for repairs, adjustments, or inspection—while still protecting threaded connections from vibration and loosening. Use it when you want a controlled, low-strength bond in metal assemblies and a bottle size suited to workshop use.