Threadlockers
Blue, medium strength, primerless threadlocker
This iconic threadlocker locks and seals metal nuts and bolts to prevent loosening due to shock and vibration. Medium strength: removable with hand tools.
All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.
- Description
- Technical specification
- Rating & reviews
- Question & answer
LOCTITE® 243 is a blue, general purpose threadlocker that provides a medium-strength bond. It works on all metals without primer, including passive substrates such as stainless steel, aluminum, and plated surfaces. Suitable for use on most oil-coated, 'as-received' fasteners without cleaning.
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Prevents fastener loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
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Works on all metals, including passive substrates
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Suitable for use on most oil-coated, 'as-received' fasteners without cleaning
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Can be disassembled with ordinary hand tools for easy service and maintenance
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NSF/ANSI 61 certified
- Product category:
- Threadlockers
- Technologies:
- Acrylates, anaerobic cure
- Application method:
- Dispense gun,Dispense system,Manual
- Application temperature:
- -55.0 °C - 180.0 °C (-65.0 °F - 360.0 °F)
- Applications:
- Threadlocking
- Breakaway torque, M10 Steel Nuts/Bolts:
- ~ 26.0 N·m (~ 230.0 in./lb.)
- Color:
- Blue
- Cure type:
- Anaerobic cure
- Fixture time:
- 10.0 min.
- Key characteristics:
- Disassembly: removable,Fluorescent,General purpose,Oil tolerant,Primerless,Strength: medium strength,Thixotropic
- Physical form:
- Liquid
- Prevail torque, M10 Steel Nuts/Bolts:
- 5.0 N·m (40.0 in./lb.)
- Recommended for use with:
- Metal,Metal: passive metal
- Specific gravity, @ 23.0 °C:
- 1.08
- Viscosity, Speed 20 RPM:
- 2150.0 mPa·s (cP)
How to use
LOCTITE® 243 is suitable for use on most "as-received" fasteners with light coatings of corrosion prevention oils without cleaning. However, for heavily oiled or contaminated fasteners, it is recommended to use LOCTITE® SF 7063, SF 7064, or SF 7070 to degrease and clean surfaces prior to applying LOCTITE 243 threadlocker.
If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use activator LOCTITE SF 7240 or LOCTITE SF 7649 (see cure speed vs activator graph in the TDS).
Apply liquid threadlocker to the engagement area. For manual dispensing, the use of a peristaltic handgun or the LOCTITE® Pro Pump is recommended to ensure a consistent application volume.
Insert bolt and apply threadlocker to the exposed thread. Assemble nut and tighten to the correct/specified torque.
Apply several drops of liquid threadlocker down the sides of the blind hole filling the lower third. Apply several drops to the bolt.
Assemble and tighten. If several bolts are being assembled, torque them down to the correct value within the fixture.
Disassemble with standard hand tools.
For the disassembly of corroded or seized parts use LOCTITE® LB 8040 Freeze and Release.
FAQ
Prevent vibration loosening, prevent leaks, protect threaded components from corrosion and increase the reliability of mechanical fasteners by using a LOCTITE® anaerobic threadlocking adhesive.
The standard continuous operating temperature range for LOCTITE® anaerobic adhesives is -55˚C to +150˚C.
Depending on the specific application requirements, high-performance grades are also available offering increased temperature resistance. Please consult with the Henkel technical team for availability and grade selection.
Yes, Henkel's anaerobic adhesives become highly resistant thermoset polymers once cured, making them suitable for a vast number of applications. Consult our online product resources or contact our technical teams for further information.
Yes, these products are all anaerobic adhesives that will function in a similar way. Variations in the adhesive characteristics (viscosity, gap-fill, strength etc.) will make them better suited to certain applications. Consult the product technical data sheets and/or Henkel representatives for further information.
