LOCTITE® 243 Blue Medium Strength Threadlocker
Known as LOCTITE 243 Blue Threadlocker
Features and Benefits
Available sizes:
Locks and seals metal nuts and bolts to prevent loosening due to shock and vibration. Medium strength, removable with hand tools.
LOCTITE® 243 is a blue, general purpose threadlocker that provides a medium strength bond. It works on all metals, including passive substrates such as stainless steel, aluminum and plated surfaces without the use of primer. Proven to be tolerant of minor contamination due to industrial oils, e.g., motor oils, corrosion prevention oils and cutting fluids.
- Prevents fastener loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
- Works on all metals, including passive substrates (e.g. stainless steel, aluminum, plated surfaces)
- Proven to tolerate minor contamination by industrial oils, e.g. motor oils, corrosion prevention oils and cutting fluids
- Permits disassembly with hand tools for servicing
- NSF/ANSI 61 Certified
Documents and Downloads
Safety Data Sheets and RoHs
- 50 ml Bottle 10.0/case - IDH 1329467
- 250 ml Bottle 10.0/case - IDH 1329505
- 10 ml Bottle 10.0/case - IDH 1329837
- 0.5 ml Bottle 100.0/case - IDH 1330255
- 1 l Bottle 4.0/case - IDH 1330333
LOCTITE® 243, 250 ml Bottle 1329505 en-US
IDH:
1329505
EAN:
079340438989
Size Case: 250 ml Bottle
Quantity: 10.0/case
LOCTITE® 243, 0.5 ml Bottle 1330255 en-US
IDH:
1330255
EAN:
079340439009
Size Case: 0.5 ml Bottle
Quantity: 100.0/case
LOCTITE® 243, 1 l Bottle 1330333 en-US
IDH:
1330333
EAN:
079340439016
Size Case: 1 l Bottle
Quantity: 4.0/case
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Technical Information
| Application method | Dispense Gun, Dispense System, Manual |
| Application temperature | -55.0 - 180.0 °C (-65.0 - 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
LOCTITE 243 Threadlocker Product Overview
Step by Step Guide
1. Preparation - Cleaning
It is recommended to use LOCTITE® SF 7070™ to degrease and clean surfaces prior to applying threadlocker adhesive.
2. Preparation - Activation
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 7649™ (see cure speed vs activator graph in the TDS).
3. Application
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.
4. Application - Through Hole
Insert bolt and apply threadlocker to the exposed thread. Assemble nut and tighten to the correct/specified torque.
5. Application - Blind Hole
Apply several drops of liquid threadlocker down the sides of the blind hole filling the lower third. Apply several drops to the bolt.
6. Assembly
Assemble and tighten. If several bolts are being assembled, torque them down to the correct value within the fixture.
7. Disassembly - Hand Tools
Disassemble with standard hand tools.
Hint
For the disassembly of corroded or seized parts use LOCTITE® LB 8040™ Freeze and Release.
Where to Buy
Buy Online
LOCTITE® 243
Locks and seals metal nuts and bolts to prevent loosening due to shock and vibration. Medium strength, removable with hand tools.
- 50 ml Bottle 10.0/case - IDH 1329467
- 250 ml Bottle 10.0/case - IDH 1329505
- 10 ml Bottle 10.0/case - IDH 1329837
- 0.5 ml Bottle 100.0/case - IDH 1330255
- 1 l Bottle 4.0/case - IDH 1330333
Buy Nearby
Use our distributor locator to find your nearest store.
* Contact the distributor to confirm that the selected product is in stock.
Go To distributor locatorFrequently Asked Questions
What products can I use to prevent vibration loosening of parts? / How do I prevent vibration loosening and leak paths?
What temperatures can threadlockers/thread sealants/gasketing materials work up to?
Are threadlockers/sealants/gasketing materials resistant to fluids such as gasoline, diesel, engine oil, water, glycol, acids, alkalis, hydraulic fluid, etc.?
Can threadlockers be used as thread sealants? / Can thread sealants be used as threadlockers?
LOCTITE® 243
Locks and seals metal nuts and bolts to prevent loosening due to shock and vibration. Medium strength, removable with hand tools.
How to Secure Threaded Assemblies
Threaded assemblies are present in most machines. Learn how they work and how to get your threads secured with LOCTITE®XPLORE, our new e-learning platform for Assembly, Maintenance and Vehicle Repair professionals.