Loctite 263 threadlocker is a red, high-strength adhesive developed for permanent locking and sealing of heavy-duty threaded fasteners. Formulated for direct application to oily surfaces without cleaning, Loctite 263 threadlocker is the industrial-grade solution trusted for automotive, mechanical, and manufacturing applications where fastener security is critical.
It is particularly effective on bolts up to 1″ (25 mm) in diameter, making it perfect for engines, gearboxes, and structural machinery.
When standard threadlockers aren’t enough, Loctite 263 threadlocker delivers the maximum holding power needed for demanding environments. Its enhanced oil tolerance makes it ideal for use on as-received parts without time-consuming degreasing.
Core benefits:
High-strength formulation: Prevents loosening from vibration or shock
Permanent hold: Requires localized heat for disassembly
Oil-tolerant: No need to clean surfaces before use
High temperature resistance: Withstands up to 360°F (182°C)
Ideal for heavy-duty fasteners: Suitable for large bolts and nuts
Designed for heavy-duty applications, Loctite 263 threadlocker is widely used in:
Automotive engines and suspensions
Heavy machinery and power equipment
Pumps, motors, and gearboxes
Hydraulic press systems
Construction and agricultural equipment
It is the preferred threadlocker for applications requiring permanent, tamper-resistant fastening that stands up to tough conditions.
Shake the product before use.
Apply Loctite 263 threadlocker to the threads of the fastener.
Assemble and tighten parts as required.
Allow to cure (fixture time 10–20 minutes; full strength in 24 hours).
Note: Disassembly requires heating the part to 500°F (260°C) followed by use of hand tools.
This 50ml version is ideal for maintenance professionals and manufacturers requiring multiple applications of high-strength threadlocker.
Compact size for toolboxes
Clean, precise nozzle
Long-lasting volume for industrial use
LOCTITE’s reputation in industrial adhesives is unmatched. Loctite 263 threadlocker is part of its elite lineup of professional-grade thread securing solutions. It offers exceptional bonding power while simplifying maintenance by reducing the risk of mechanical failure due to loosening.
From OEMs to field repairs, this product is a trusted partner for safety and reliability.