Product Name
Permabond Anaerobic HM128 Threadlocker Adhesive with high strength and environmental resistance
Brief Description
Permabond HM128 is a high-strength, red anaerobic threadlocker adhesive designed for the permanent assembly of threaded fasteners. It prevents loosening caused by vibration, shock, and thermal expansion, while also providing excellent corrosion protection and sealing properties. This adhesive cures quickly at room temperature in the absence of oxygen when confined between close-fitting metal surfaces.
Popular Applications & Uses
- Permanent locking of bolts, studs, and cap screws- Preventing vibration loosening in critical assemblies- Replacing traditional mechanical locking devices such as lock washers- Sealing threaded assemblies against leakage and corrosion- Securing fasteners in machinery, equipment, and electric motors- Applications requiring controlled off-torque
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Electrical Services or Products (e.g., electric motor manufacturing)- Energy (for heavy machinery and equipment)- Fabrication- General Manufacturing- Government & Military (meets MIL-SPEC standards)- Marine- Metal Fabrication- Transportation/Specialty Vehicle (e.g., heavy machinery, aircraft components)
Special and Unique Features
- High strength for permanent assembly- Superior environmental resistance- Provides corrosion protection- Lubricates threads for easier assembly- 100% solids, environmentally friendly- Fast curing at room temperature- Military-grade adhesive, meeting MIL-SPEC MIL-S-46163A Type I, Grade K and ASTM D5363 AN 0221
Key Properties
- Chemical Composition: Methacrylate esters- Appearance: Red liquid- Viscosity @ 25°C: 500 mPa.s (cP) (low viscosity)- Specific Gravity: 1.1- Maximum Gap Fill: 0.15 mm (0.006 inches)- Maximum Thread Size: M20 (3/4 inches)- Handling Strength (M10 steel @ 23°C): ~15 minutes- Full Cure Time (M10 steel @ 23°C): 24 hours- Torque Strength (M10 steel ISO10964): Break 31 N·m (275 in.lb), Prevail 40 N·m (350 in.lb)- Shear Strength (steel collar & pin ISO10123): 17 MPa (2500 psi)- Temperature Range: -55°C to 150°C (-65°F to 300°F)- Dielectric Strength: 11 kV/mm- UV fluorescence: Yes
Surface Compatibility
- Steel- Common bolt platings- Cross-linked plastics (after full cure)- Best results on clean, dry, and grease-free surfaces (acetone or isopropanol recommended for cleaning)- Can be used on inactive surfaces (e.g., zinc, aluminum, stainless steel); cure speed can be enhanced with Permabond A905 or ASC10 activators
Known backups / known substitutes
- Loctite® 263- 3M™ Scotch-Weld™ TL71- Permatex® Red Threadlocker- Loctite 270, 271, 272, 275, 620, 638, 660 (Permabond alternatives listed)
Comparison Note
Permabond HM128 is a high-strength, permanent red threadlocker, comparable to other red threadlockers in the market such as Loctite 263 and Permatex Red Threadlocker. It offers similar performance in terms of preventing vibration loosening, providing corrosion protection, and requiring localized heat for disassembly, distinguishing it from medium (blue) or low (purple) strength threadlockers that allow for easier removal with hand tools.
