What Is the LOCTITE® 201 ECO™ Coating for Threaded Fasteners?
LOCTITE® DRI 201 ECO™ is a high-strength, pre-applied threadlocker designed to lock and seal threaded fasteners. The two-component acrylic coating uses methacrylate ester technology and remains dry-to-the-touch and inert until the fastener is assembled.
During assembly, microcapsules within the coating are crushed, releasing an active ingredient that initiates the anaerobic curing process. The coating fills voids in the threads and cures to securely lock and seal the assembly. This makes DRI 201 ECO particularly suitable for high-volume production environments where components need to arrive ready for immediate use and applying a liquid threadlocker during assembly may not be practical.
Key Benefits
- High-strength threadlocking
- Locks and seals threaded assemblies
- Helps prevent loosening caused by vibration
- Dry-to-the-touch, pre-applied coating
- Ready for immediate assembly
- Eliminates the need to apply liquid threadlocker on the production line
- Four-year on-part life
- Performs across multiple steel fastener finishes
- Maintains locking performance under elevated-temperature conditions
- Good resistance to common automotive and industrial fluids
- Well suited for high-volume manufacturing
Where Is LOCTITE® DRI 201 ECO™ Used?
| Application | How DRI 201 ECO Supports the Assembly |
|---|---|
| Carburetor Screws | Provides high-strength locking to resist loosening |
| Transmission Nuts | Locks threaded connections exposed to vibration |
| Head Bolts | Provides strong locking and sealing performance |
| Truck Axle Bolts | Helps secure threaded connections in demanding assemblies |
| Tower Bolts | Provides high-strength vibration resistance |
| Transmission Bolts | Locks while also sealing threaded connections |
| Pipe Plugs & Fittings | Fills thread voids to help create a sealed connection |
| High-Volume Assembly | Provides pre-coated fasteners ready for immediate installation |
Industries & Markets
| Industry or Market | Typical Application |
|---|---|
| Automotive | Carburetor, transmission, head-bolt, and related fastener applications |
| Heavy-Duty Vehicles | Truck axle bolts and vibration-exposed threaded components |
| Powertrain & Transmission | Transmission nuts and bolts requiring locking and sealing |
| Industrial Manufacturing | High-strength threaded assemblies |
| Fluid Handling | Pipe plugs and fittings requiring thread sealing |
| High-Volume Manufacturing | Pre-applied fasteners ready for production-line assembly |
Technical Highlights
| Property | LOCTITE DRI 201 ECO Performance |
|---|---|
| Technology | Acrylic |
| Chemical Type | Methacrylate ester |
| Components | Two-component |
| Cure | Anaerobic |
| Application | Threadlocking, sealing |
| Strength | High |
| On-Part Life | 4 years |
| Breakaway Torque – 24 Hours | ≥17 N·m |
| Breakaway Torque – 72 Hours | ≥25 N·m |
| Breakloose Torque – Anti-Rust Steel | 53 N·m |
| Breakloose Torque – Zinc-Plated Steel | 48 N·m |
| Breakloose Torque – Magni 554 | 52 N·m |
| Coefficient of Friction | ≤0.15–0.20 depending on tested fastener combination |
DRI 201 ECO also demonstrated breakaway torque of ≥15 N·m when tested at 204°C following the specified curing and heat exposure, demonstrating its ability to maintain locking performance at elevated temperature.
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 High-Strength Pre-Applied Threadlocking?
LOCTITE DRI 201 ECO provides high-strength locking and sealing for threaded components that need to resist vibration and demanding operating conditions.