Permatex Medium-Strength Threadlocker Blue 36 ml — Removable Automotive Threadlocker, Vibration & Corrosion Protection

Permatex 24240 Medium Strength Threadlocker Blue is a removable, medium-strength liquid threadlocker that secures fasteners from vibration and protects threads from corrosion while remaining serviceable with hand tools.

This 36 ml vial of Permatex 24240 (blue) is an OEM-specified, all-purpose threadlocker designed for nut and bolt sizes from 1/4" to 3/4" (6 mm to 20 mm). Formulated to lock and seal fasteners without permanently bonding them, it eliminates the need to carry multiple lock nuts or lock washers and suits common automotive and mechanical repair tasks. The product cures on metal surfaces when exposed to air and provides reliable resistance to loosening caused by vibration across a wide temperature range.

How does Permatex 24240 keep bolts from coming loose during driving or operation?

Permatex 24240 fills the gaps between mating threads and forms a tough locking film as it cures, reducing the chances of fastener rotation under vibration. It bonds to metal surfaces and dampens micro-movement that can lead to loosening.

• Works on nut and bolt diameters 1/4"–3/4" (6–20 mm)
• Medium strength — resists vibration yet removable with hand tools
• Cures on contact with air and metal surfaces for a secure hold
• Compatible with common automotive assemblies

Will this threadlocker protect my threads from corrosion and seizing?

Yes — the cured film acts as a barrier that helps shield threads from moisture and corrosive elements, reducing the chance of galvanic or rust-related seizing. That protection is particularly useful where fasteners are exposed to road salt, oil, or humidity.

• Forms a sealing film to block moisture and contaminants
• Helps prevent rust-related galling and thread damage
• Suitable for assemblies that require occasional disassembly
• Operates across a broad temperature range (-65°F to 300°F)

How do I remove or disassemble fasteners treated with this medium-strength formula?

Permatex 24240 is engineered to be removable with standard hand tools; no special heat or hazardous chemicals are required for typical disassembly. If a fastener is particularly tight, light heat or common workshop techniques can aid removal without damaging components.

• Designed for removal with hand tools (wrenches, sockets)
• Medium strength balances holding power and serviceability
• Heat can speed disassembly for stubborn fittings if needed
• Leaves threads intact for reuse after cleaning

Where is this threadlocker best applied in a vehicle or machine?

Permatex 24240 is intended for general-purpose fasteners across many automotive and mechanical systems. It's commonly used where secure fastening is required but periodic maintenance or adjustment may still be needed.

• Valve cover bolts, oil pan bolts, and water pump bolts
• Drive shaft bolts, rocker arm adjustment nuts, carburetor studs
• Fasteners exposed to vibration or moderate temperatures
• Ideal for 1/4" to 3/4" threaded assemblies

Who is this for: Permatex 24240 Medium Strength Threadlocker is aimed at professional mechanics, DIY vehicle owners, motorcycle and small-engine enthusiasts, and general maintenance technicians who need reliable fastener security without permanent locking. Choose this product when you want dependable vibration resistance and corrosion protection while retaining the ability to remove and service fasteners with normal tools.

• Features: Locks and seals while preventing parts loosening due to vibration
• Protects threads from corrosion
• Ideal for nut and bolt sizes 1/4" to 3/4" (6 mm to 20 mm)
• Removable with hand tools for easy disassembly