Applications

PERMABOND® HM128 – High-strength anaerobic threadlocker preventing vibration loosening for bolts, studs, and machinery assemblies

Item Name: PERMABOND® HM128
Manufacturer: Permabond
Technologies: Methacrylate esters, anaerobic adhesive
Color: Red
Cure Type: Anaerobic, room temperature
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.

1. Product Overview

PERMABOND® HM128 is a high-strength anaerobic threadlocker designed for permanent assembly of threaded fasteners. It prevents vibration loosening, provides corrosion protection, and cures to a tough thermoset plastic at room temperature in the absence of air and in contact with metal. It is tested against MIL-S-46163A Type I Grade K and ASTM D5363 standards, making it suitable for demanding industrial and military applications.


2. Applications

  • Permanent locking of bolts, studs, and cap screws.

  • Machinery, equipment, and electric motor manufacturing.

  • Replacement for lock washers and mechanical threadlocking methods.

  • Use in environments exposed to vibration, chemicals, and temperature fluctuations.

3. Typical Properties

Uncured Adhesive

Property Value
Chemical composition Methacrylate esters
Appearance Red
Viscosity @ 25°C 500 mPa·s
Specific gravity 1.09
Maximum gap fill 0.15 mm (0.006 in)
Maximum thread size M20 (¾”)
Handling time (steel) ~15 minutes
Full strength 24 hours

Cured Adhesive

Property Value
Torque strength (ISO 10964, M10 steel) Break: 31 N·m (275 in·lb)
Prevail: 40 N·m (350 in·lb)
Shear strength (ISO 10123, steel collar & pin) 17 MPa (2500 psi)
Coefficient of thermal expansion 90 × 10⁻⁶ /°C
Thermal conductivity 0.19 W/(m·K)
Dielectric strength 11 kV/mm
Electrical resistance 10¹⁷ Ω
Temperature resistance -55°C to ~150°C continuous; brief exposure higher
Chemical resistance (340h at 75°C) Water: 98%
Butyl alcohol: 94%
Toluene: 98%
Motor oil: 100%
Hydrocarbon fluid: 96%
JP4 jet fuel: 100%
JP5 jet fuel: 90%
Ethylene glycol: 96%

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