Introduction
Loctite 243 Medium Strength Surface Insensitive Threadlocker is a versatile anaerobic adhesive designed for general-purpose automotive applications. This product effectively bonds to all metals, including stainless steel, aluminum, and plated surfaces, offering enhanced oil tolerance for reliable performance even in challenging conditions. It is ideal for securing components subjected to heavy shock, vibration, and chemical exposure, ensuring a secure, one-piece assembly that resists loosening.
Figure 1: Loctite 243 Medium Strength Surface Insensitive Threadlocker 36-ml.
Safety Information
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Always read the Safety Data Sheet (SDS) before use. Ensure adequate ventilation. Avoid contact with skin and eyes. In case of contact, rinse immediately with plenty of water. If swallowed, seek medical advice immediately. Keep out of reach of children.
Product Overview
Key Features:
- Design: Ideal for fasteners between 1/4-Inch to 3/4-Inch (6 mm to 20 mm).
- Secure: Locks and seals while preventing parts from loosening due to vibration.
- Results: Secure, one-piece assembly that will not loosen under stress.
- Easy to Use: Parts can be separated using hand tools.
- Fit Type: Vehicle Specific.
Technical Specifications:
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Model | 1330906 |
| Item Form | Liquid |
| Color | Blue |
| Item Volume | 36 Milliliters (1.22 Fluid Ounces) |
| Compatible Material | Metal (Aluminum, Stainless Steel) |
| Specific Uses For Product | Repair |
| Special Feature | Oil Tolerant, High-Temperature, General Purpose |
| Full Cure Time | 24 Hours |
| Item Weight | 2.88 ounces |
| Product Dimensions | 8 x 3.81 x 1.25 inches |
| UPC | 079340439092 |
Setup and Preparation
For optimal performance, ensure surfaces are clean and dry before applying Loctite 243. Remove any oil, grease, or other contaminants using a suitable cleaning agent. While Loctite 243 is surface insensitive and has enhanced oil tolerance, a clean surface will always yield the best results.
Figure 2: Ensure parts are clean and ready for application.
Operating Instructions
Application Steps:
- Shake Well: Shake the product thoroughly before use.
- Apply to Threads: Apply a few drops of Loctite 243 to the threaded area of the fastener. For through-holes, apply the product to the bolt and the leading edge of the nut. For blind holes, apply the product to the bottom of the blind hole and the mating portion of the bolt.
- Assemble Parts: Assemble the parts promptly. The product will begin to cure when confined in the absence of air between close-fitting metal surfaces.
- Cure Time: The product sets in just 10 minutes (fixture time), allowing for a fast start. It reaches full strength within 24 hours. Avoid disturbing the assembly during the curing process.
Figure 3: Apply a small amount of threadlocker to the bolt threads.
Figure 4: Loctite 243 is suitable for various metal components.
Figure 5: The threadlocker provides a durable bond for engine parts.
Maintenance
Store Loctite 243 in its original container in a cool, dry location. Optimal storage temperature is 8°C to 21°C (46°F to 70°F). Do not return unused product to the original container as contamination may reduce shelf life. The product has a shelf life of approximately 2 years when stored properly in unopened containers.
Troubleshooting
Common Issues:
- Product Not Curing: Ensure the surfaces are metal and that there is minimal air exposure once assembled. Anaerobic adhesives cure in the absence of air and in contact with active metal surfaces. If using on inactive metals (e.g., stainless steel, zinc, cadmium), consider using an activator like Loctite 7649 or 7471.
- Difficulty Disassembling: Loctite 243 is a medium-strength threadlocker, meaning parts can typically be separated using standard hand tools. For stubborn assemblies, localized heat (e.g., from a heat gun) may be applied to soften the adhesive before attempting disassembly.
Warranty and Support
For detailed warranty information, technical support, or further assistance with your Loctite 243 Medium Strength Surface Insensitive Threadlocker, please visit the official Loctite website or contact their customer service department. Refer to the product packaging for specific contact details and regional support information.