Product Name
Permabond Anaerobic HM129 threadlocker and sealant with high strength medium viscosity
Brief Description
Permabond® HM129 is a high strength, medium viscosity anaerobic threadlocker and sealant. This material is designed to cure in the absence of air when confined between tight-fitting metal parts. It is primarily used for locking and sealing bolts, nuts, and screws that require permanent assembly, effectively preventing loosening and leakage.
Popular Applications & Uses
- Locking and sealing bolts, nuts, and screws for permanent assembly.- Preventing loosening of threaded assemblies caused by vibration, shock, and thermal expansion.- Sealing threaded connections to prevent leakage of moisture, gases, fluids, or contaminants.- Providing corrosion protection for threaded assemblies.- Securing studs into motor housings.- Locking machine tool access bolts.- Locking and sealing gearbox and drive shaft bolts.- Securing conveyor roller bolts.- Locking bearing cover cap screws.
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Construction/Building Services (for machinery and equipment)- Electrical Services or Products / LED/Electronics- General Manufacturing- Government & Military- Marine- Metal Fabrication- Transportation/Specialty Vehicle
Special and Unique Features
- High strength for permanent assembly.- Medium viscosity for versatile application.- Cures in the absence of air between tight-fitting metal parts.- Fast and reliable cure on various metal fasteners, including steel, cadmium, and zinc.- Oil tolerant, offering superior performance even with slight surface oil contamination.- Highly resistant to vibration.- Lubricates threads for easier assembly.- Provides excellent corrosion protection.- Solvent-free formulation.- Features UV fluorescence for easy inspection.
Key Properties
- Chemical composition: Acrylic- Appearance: Red- Viscosity @ 25°C: 500 mPa.s (cP)- Specific Gravity: 1.1- Maximum gap fill: 0.15 mm (0.006 in) for M20 ¾” threads- Handling strength (M10 steel @23°C): 10 minutes- Working strength (M10 steel @23°C): 1-3 hours- Full strength (M10 steel @23°C): 24 hours- Torque strength (M10 steel ISO10964): Break 33 N·m (290 in.lb), Prevail 58 N·m (520 in.lb)- Shear strength (steel collar & pin ISO10123): 17 MPa (2500 psi)- Temperature range: -55°C to 149°C (-65°F to 300°F) for continuous operation, with ability to withstand higher temperatures for brief periods.- Dielectric strength: 11 kV/mm- Thermal conductivity: 0.19 W/(m.K)
Surface Compatibility
- Cures reliably on active metal surfaces such as steel, cadmium, zinc, and other plated fasteners.- Best results are achieved on clean, dry, and grease-free metal surfaces.- Tolerates a slight degree of surface contamination, including the presence of oil.- Copper and its alloys can accelerate the cure speed, while passivated surfaces like stainless steel may reduce it.- Not recommended for use in contact with oxygen, oxygen-rich systems, or strong oxidizing materials.- Users should check compatibility with thermoplastics as the product may adversely affect some types.- Anaerobic adhesives generally do not bond well to glass, plastic, or rubber.
Known backups / known substitutes
- Other Permabond anaerobic threadlockers, such as HH131 (for high temperature), MM115, HM118, HL126, and HM128.- Loctite anaerobic threadlockers, including Loctite 272, 2422 (medium strength), and 2620 (high strength).- Anaerobic adhesives from Adhesive Systems (ASI), such as ASI 71TL.- SAF-T-LOK anaerobic threadlockers, including military-grade options.- 3M anaerobic adhesives.- Parson Adhesives' SONLOK® High Performance Anaerobic Adhesives.- AST-LOCK™ Anaerobic Threadlockers.
Comparison Note
Permabond HM129 stands out as a high-strength, permanent anaerobic threadlocker and sealant, ideal for applications demanding robust and lasting assembly where frequent disassembly is not anticipated or can be managed with heat. Its oil-tolerant nature and excellent vibration resistance provide a significant advantage over threadlockers that require perfectly clean surfaces or offer lower strength. The medium viscosity of HM129 ensures good gap-filling capabilities for threaded fasteners up to M20 ¾”.
