What Is the LOCTITE® 203 ECO™ Coating for Threaded Fasteners?
LOCTITE® DRI 203 ECO™ is a low- to medium-strength, pre-applied threadlocking and sealing coating for threaded fasteners. The two-component acrylic formulation remains dry-to-the-touch and inert until assembly activates the quick-curing resin.
Once activated, the resin fills voids within the threads and cures to lock and seal the assembly while helping prevent vibration-related loosening. The product has a stated operating range of -54°C to +150°C.
Key Benefits
- Low- to medium-strength threadlocking
- Combines locking and sealing
- Helps prevent loosening caused by vibration
- Dry-to-the-touch, pre-applied film
- 10-minute fixture time
- Four-year on-part life
- Operating range from -54°C to +150°C
- Good chemical and solvent resistance
- Low-toxicity formulation
- Suitable for automated fastener coating and high-volume processing
Where Is LOCTITE® DRI 203 ECO™ Used?
| Application | How DRI 203 ECO Supports the Assembly |
|---|---|
| Carburetor Screws | Provides lower-strength locking where appropriate |
| Transmission Nuts | Helps prevent vibration-related loosening |
| Head Bolts | Locks and seals threaded connections |
| Truck Axle Bolts | Provides locking and sealing performance |
| Tower Bolts | Helps secure threaded assemblies |
| Transmission Bolts | Combines locking with thread sealing |
| Pipe Plugs & Fittings | Helps seal voids within threaded connections |
| Pre-Coated Fasteners | Allows components to arrive ready for assembly |
Industries & Markets
| Industry or Market | Typical Application |
|---|---|
| Automotive | Threaded fasteners requiring low- to medium-strength locking |
| Heavy-Duty Vehicles | Axle and vibration-exposed threaded assemblies |
| Powertrain & Transmission | Transmission nuts and bolts |
| Industrial Manufacturing | General threaded locking and sealing |
| Fluid Handling | Pipe plugs and fittings |
| Fastener Processing | Pre-applied components for production environments |
Technical Highlights
| Property | LOCTITE DRI 203 ECO Performance |
|---|---|
| Technology | Acrylic |
| Chemical Type | Methacrylate ester |
| Components | Two-component |
| Cure Type | Anaerobic |
| Application | Threadlocking, sealing |
| Strength | Low to medium |
| Toxicity | Low |
| Operating Range | -54°C to +150°C |
| On-Part Life | 4 years |
| Cure Time | 72 hours |
| Fixture Time | 10 minutes |
| Breakaway Torque | ≥11.3 N·m |
| Prevail Torque | ≥5.6 N·m |
Chemical Resistance
| Environment | Temperature | 100 hours | 500 hours | 1,000 hours |
|---|---|---|---|---|
| Motor Oil | 125°C | 117% | 96% | 86% |
| Motor Oil | 87°C | 125% | 112% | 105% |
| Unleaded Gasoline | 22°C | 102% | 113% | 119% |
| Brake fluid | 22°C | 101% | 105% | 114% |
| Ethanol | 22°C | 102% | 112% | 112% |
| 1,1,1 Trichloroethane | 22°C | 104% | 116% | 112% |
| Water/Glycol 50/50 | 87°C | 119% | 112% | 108% |
Need a Lower-Strength Pre-Applied Threadlocker?
LOCTITE DRI 203 ECO provides low- to medium-strength locking and sealing in a pre-applied coating designed to simplify threaded-component assembly.