Description
Permabond MM115 is a general-purpose, medium-strength anaerobic threadlocker designed to lock and seal metal threaded fasteners while still allowing controlled disassembly with standard hand tools. It prevents vibration loosening, maintains consistent clamp load, and provides long-term corrosion protection in demanding industrial environments.
MM115 cures reliably at room temperature on steel, cadmium, zinc, and other plated fasteners. Its thixotropic, non-drip formulation stays where applied, making it suitable for both vertical and overhead fastener assemblies. Major use areas include machinery and equipment manufacturing, general industrial assembly, and maintenance operations.
Permabond MM115 is widely specified as a direct alternative to medium-strength blue threadlockers such as Loctite 242 and 243, offering consistent performance with verified military and ASTM compliance.
Key Features and Benefits
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Medium-strength threadlocker allowing disassembly with hand tools
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Prevents vibration-induced loosening of nuts, bolts, and screws
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Controlled off-torque for predictable serviceability
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Lubricates threads during assembly for consistent torque values
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Provides corrosion protection against moisture and environmental exposure
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Thixotropic, non-drip formulation for clean application
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100 percent solids and solvent free
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Full cure at room temperature
Specifications and Compliance
Each production lot of Permabond MM115 is tested to meet the following military and industry standards:
Military Specifications
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MIL-S-46163A Type II Grade N
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MIL-S-22473E Grade CVV
ASTM Specifications
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ASTM D5363 AN 0143 Group 01 Class 4 Grade 3
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ASTM D5363 AN 0321 Group 03 Class 2 Grade 1
Typical Applications
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Machinery and equipment manufacturing
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Industrial fastener locking and sealing
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Motors, pumps, and compressors
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Gearboxes and mechanical assemblies
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Maintenance and repair operations
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High-vibration metal threaded assemblies
Compatible Substrates
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Carbon steel and alloy steel
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Zinc-plated fasteners
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Cadmium-plated fasteners
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Other common plated metal fasteners
Note: Cure speed may be slower on passive surfaces such as stainless steel or aluminum without the use of an activator.
Technical Specifications
| Property | Value |
|---|---|
| Chemistry | Methacrylate esters |
| Appearance | Blue |
| Viscosity at 25°C | 1,300 mPa·s |
| Specific Gravity | 1.1 |
| Maximum Gap Fill | 0.15 mm (0.006 in) |
| Handling Strength | 10 minutes at 23°C |
| Full Cure | 24 hours |
| Break Torque (M10 Steel) | 16 N·m (140 in·lb) |
| Prevail Torque (M10 Steel) | 7 N·m (60 in·lb) |
| Compressive Shear Strength | 10 MPa (1,450 psi) |
| Temperature Range | -55°C to 150°C (-65°F to 300°F) |
Directions for Use
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Ensure fasteners are clean, dry, and free of oil or grease.
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For through holes, apply a bead across the contact length of the threads.
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For blind holes, apply several drops to the bottom of the hole.
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Assemble and torque to the required specification.
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Allow approximately 10 minutes for handling strength and 24 hours for full cure.
To accelerate cure on passive metals, use Permabond A905 or ASC10 activator.
Why Choose Permabond MM115
Permabond MM115 offers a dependable medium-strength threadlocking solution with proven military and ASTM compliance. Its balance of strength, serviceability, and environmental resistance makes it a trusted choice for manufacturers and maintenance professionals who require consistent fastening performance without sacrificing removability.
Need Help Selecting the Right Threadlocker
Chemical Concepts stocks a full range of Permabond anaerobic adhesives, including low, medium, and high-strength threadlockers. Contact our technical team for assistance selecting the right product for your fastener size, substrate, and service conditions.
📞 800-220-1966
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