Loctite threadlocker stick medium-strength blue 9 g — removable, non-drip wax format

Loctite 37643 Blue is a medium-strength, wax-format threadlocker stick that secures metal fasteners while remaining removable when needed.

This compact 9 g stick form of Loctite's blue threadlocker delivers anaerobic locking performance in a convenient, drip-free applicator. Formulated to work on a wide range of metal substrates — including passive materials such as stainless steel and aluminum — the wax-like glue stick tolerates light oil contamination and is engineered to stay put in overhead and hard-to-reach repairs. It bonds quickly, reaches initial handling strength in about 10 minutes, and achieves full cure over 24 hours, making it useful for both maintenance tasks and small production runs where fast throughput is important.

How quickly will it hold a bolt in place?

Loctite 37643 gains initial locking capability within roughly 10 minutes, allowing you to handle assemblies soon after application. Full cure develops over about 24 hours, delivering the medium-strength lock typical of blue threadlockers without permanent bonding.

• Initial handling strength: ~10 minutes
• Full cure time: ~24 hours
• Medium-strength formulation for removable joints
• Works on fasteners from 6 mm to 19 mm (1/4"–3/4")

Will it perform if surfaces are slightly oily or in warm conditions?

This wax-based stick tolerates minor oil contamination such as residual motor oil or cutting fluids better than many liquid adhesives, so it’s well-suited for field repairs and maintenance. Its non-drip, leak-proof formula also helps maintain bond integrity in overhead or angled applications and in environments with elevated temperatures encountered during engine or machinery work.

• Designed to resist minor oil contamination
• Non-drip stick format for overhead use
• Maintains adhesion in typical automotive heat ranges
• Reduces mess compared with liquid threadlockers

Which fasteners and jobs is this product best for?

The stick format is ideal for small to medium automotive and mechanical fasteners where a removable lock is required. Common applications include valve cover bolts, water pump bolts, oil pan bolts, drive shaft fasteners, rocker arm adjustment nuts, and carburetor studs.

• Suitable for nuts and bolts 6 mm–19 mm (1/4"–3/4")
• Recommended for automotive maintenance and repair tasks
• Good for overhead and hard-to-reach repairs
• Removable with standard disassembly tools when needed

How do you apply and later remove the threadlocker stick?

Application is straightforward: rub the wax-like stick onto clean threads or press the applicator against the fastener, then assemble the parts. To remove, apply standard mechanical force or heat and conventional tools; the medium-strength bond allows disassembly without destructive measures in most cases.

• Apply directly to male or female threads from the stick applicator
• Wipe excess; assemble and tighten as normal
• Disassemble with hand tools; heat may speed removal if needed
• Leaves minimal residue compared with permanent adhesives

Who is this for? Loctite 37643 Blue threadlocker stick is aimed at automotive technicians, home mechanics, and maintenance professionals who need a reliable, medium-strength, removable threadlocker in a tidy, non-drip format. It’s particularly useful for overhead repairs, shop and field maintenance where oil-tolerant adhesion and quick initial curing are priorities. If you want a convenient, easy-to-apply threadlock that balances secure fastening and future removability, this 9 g Loctite stick is designed for those tasks.