Loctite heavy-duty Red 271 threadlocker — 36 ml bottle for large bolts, vibration-resistant

Loctite 37479 Red 271 is a high-strength anaerobic threadlocker in a 36 ml bottle engineered to permanently secure large bolts and studs in heavy-duty automotive and industrial assemblies.

This professional-grade threadlocker bonds to all metals — including stainless steel, aluminum and plated surfaces — and is formulated for demanding environments where shock, vibration and chemicals threaten fastener integrity. OEM-specified and widely used by technicians, Red 271 tolerates residual oil and sets quickly, allowing assemblies to be put into limited service within minutes and reach full strength over 24 hours.

How quickly does Loctite Red 271 develop a functional bond?

The threadlocker starts to set in about 10 minutes and achieves full cure in roughly 24 hours under normal conditions. Initial handling strength lets you move parts sooner, while maximum performance — including resistance to shear and vibration — develops over the cure period.

• Fixture time: approximately 10 minutes
• Full cure: about 24 hours
• Cure type: anaerobic (cures when confined between metal surfaces)
• Works with residual oil and lightly contaminated threads

What types of fasteners and applications is this bottle best for?

Red 271 is formulated for heavy-duty use on large-diameter bolts and studs — typically 1 inch (25 mm) and larger — where a permanent, high-strength lock is required. Common applications include suspension components, frame brackets, shock absorber mounts and wheel studs in automotive and industrial settings.

• Optimized for large bolts, studs and structural fasteners
• Ideal for automotive suspension and chassis connections
• Compatible with most metals used in heavy machinery
• Resists loosening from heavy shock and vibration

How does Loctite Red 271 perform under heat and chemical exposure?

Designed for robust operating conditions, Red 271 maintains a durable bond at elevated temperatures up to about 140°F (60°C) and withstands many common automotive fluids and solvents. While it offers strong chemical and thermal resistance, disassembly is still possible with localized heat and standard hand tools.

• Service temperature: up to approximately 140°F (60°C)
• Chemical resistance suitable for typical automotive fluids
• Disassembly achievable with heat and mechanical force
• Engineered for long-term reliability in harsh environments

How is the product applied and removed safely?

Apply Red 271 directly to clean or slightly oily male threads, assemble parts and allow the anaerobic chemistry to cure in the absence of air. For removal, heat the fastener locally to soften the bond and use common tools to break the seal; this method permits repair or service when needed.

• Application: dispense to threaded surfaces from the 36 ml bottle
• Assembly: tighten per fastener specifications after application
• Removal: apply localized heat and use hand tools to disassemble
• Storage: keep capped and stored in a cool, dry place

Who is this for? Loctite 37479 Red 271 36 ml is aimed at professional mechanics, fleet maintenance teams and industrial technicians who require a permanent, heavy-duty threadlocking solution for large fasteners. It’s a go-to choice when components face constant shock, vibration or chemical exposure and where a dependable, long-lasting lock is critical for safety and performance. If you need an OEM-grade adhesive that cures reliably on metal fasteners and allows controlled disassembly when heated, Red 271 delivers the strength and durability expected in professional workshops.