Huitian 7271 (Original Model HT2711, equivalent to Loctite 271) is classic general-purpose high-strength permanent anaerobic thread locker in red medium-viscosity liquid. It cures under oxygen-free condition, specially designed for lifelong fastening of bolts up to M36. With ultra-high locking strength and excellent vibration resistance, it cannot be disassembled by ordinary tools; heating above 150℃ is mandatory for removal. It integrates anti-loosening, fluid sealing and rust prevention functions, widely used for large-thread assembly in heavy industry, automobiles and construction machinery.
Core Technical Parameters
– Appearance: Homogeneous red medium-viscosity liquid
– Chemical Composition: Methacrylate anaerobic resin system
– Viscosity: 400~800 mPa·s
– Density: 1.1 g/cm³
– Max gap filling: 0.13 mm
– Fixture time: ≤20 mins at 23℃ ambient temperature; fully cured within 24 hours
– Breakaway torque: 25 N·m; Removable torque: 29 N·m
– Continuous service temperature: -50℃ ~ 150℃
– Applicable thread size: M6 ~ M36 metal bolts (supports maximum thread diameter in this product line)
– Packages: 50ml bottle, 250ml large industrial bottle
– Curing Mechanism: Anaerobic curing, remains liquid permanently when exposed to air
Key Product Advantages
1. Ultra-high permanent locking strength: Higher fastening force than 7262 & 7263, ideal for large heavy-duty bolts; completely resistant to severe vibration and impact; disassembly requires heating over 150℃, not suitable for regularly maintained parts;
2. Moderate permeability: Fully penetrates all thread gaps for uniform locking and sealing, no excessive dripping to contaminate surrounding components;
3. Outstanding chemical & corrosion resistance: Durable against engine oil, diesel, hydraulic fluid, coolant and moisture, permanently prevents thread rust and fluid leakage;
4. Wide substrate compatibility: Works perfectly on cast iron, carbon steel, stainless steel, aluminum alloy and galvanized metals;
5. Ready-to-use single-component formula: No mixing required, long shelf life at room temperature for mass production;
6. Exclusive for extra-large threads: The only grade supporting bolts up to M36, the first choice for large fasteners of reducers and heavy pumps.
Main Applications
1. Permanent locking for M24~M36 large bolts on heavy truck axles, differentials, gearboxes and engine blocks;
2. Heavy-load thread fastening for traveling mechanisms, large reducers and hydraulic valves of excavators & mining machinery;
3. Thread sealing for base and end cap fasteners of generators, air compressors and high-pressure oil pumps;
4. Lifelong anti-loosening assembly for large load-bearing screws in petrochemical, metallurgy and wind power industries;
5. Rust-proof sealing for heavy-duty fasteners without periodic maintenance.）
Our experienced engineers and technical specialists are here to provide professional guidance, product selection, and application support tailored to your specific requirements.
