Loctite®, Threadlocker 243, Medium Strength

Loctite® 243 Medium-Strength Threadlocker

Loctite 243 is a medium-strength, primerless liquid threadlocker designed for locking and sealing metal threaded fasteners. It helps prevent loosening and leakage caused by shock and vibration.

The anaerobic formula cures when confined between close-fitting metal surfaces in the absence of air. Loctite 243 works on active and passive metals, including steel, stainless steel, aluminum, and most plated surfaces. It also tolerates minor contamination from thread lubricants, anticorrosion fluids, and protective fluids.

Loctite 243 is designed for assemblies that may require future servicing. Once cured, it can be removed using standard hand tools. It can be used on metal fasteners from 1/4" to 3/4" in diameter.

Sizes:

• 0.5 ml
• 10 ml
• 50 ml

Specs:

• Strength: Medium strength, temporary
• Physical Form: Liquid
• Technology: Acrylate
• Cure Type: Anaerobic
• Fixture Time: 10 minutes
• Full Cure Time: 24 hours
• Service Temperature Range: -65°F to 360°F
• Fastener Size: 1/4" to 3/4" in diameter
• Removal: Standard hand tools
• Primer Required: No
• Oil Tolerant: Yes

Recommended Materials:

• Brass
• Steel
• Aluminum
• Zinc
• Iron
• Plated metal surfaces
• Other active and passive metals

Application Instructions:

• Prepare: Clean threaded parts before application. Loctite 243 tolerates minor surface contamination, but heavily contaminated parts should be cleaned.
• Apply: Apply the threadlocker to the threaded engagement area.
• Assemble: Assemble and tighten the fastener as required.
• Cure: Allow the product to cure. Typical fixture time is 10 minutes, and full cure is reached in 24 hours.

Fixture and cure times can vary based on the substrate, temperature, bond gap, and use of an activator.

Disassembly:

Remove using standard hand tools.

Safety and Handling:

Read and follow the product label and current Safety Data Sheet before use.

Safety Data Sheet (SDS) available upon request.

Threadlockers vs. Superglues

Loctite 243 is an anaerobic threadlocker designed for metal threaded fasteners. It cures between close-fitting metal surfaces in the absence of air. Superglues use a different adhesive technology and are intended for bonding surfaces rather than locking threaded metal fasteners.

Loctite / Henkel

Loctite is an American adhesive brand founded in 1953 and acquired by Henkel in 1997. The brand offers adhesives, sealants, and coatings for manufacturing, maintenance, repair, and assembly applications.