Applications

LOCTITE® 243™ – Adhesive – Threadlocking

  • Item Name: LOCTITE® 243™
  • Manufacturer: Henkel
  • Technologies: Acrylic, Dimethacrylate ester
  • Color: Blue
  • Cure Type: Anaerobic, Secondary Cure (Activator)
  • Package Size: Contact to Techniq VN for details.
  • Shelf Life: Contact to Techniq VN for details.

1. Product Overview

  • Technology: Acrylic
  • Chemical Type: Dimethacrylate ester
  • Appearance (Uncured): Blue
  • Fluorescence: Positive under UV light
  • Viscosity: Medium, thixotropic
  • Cure Mechanism: Anaerobic, with secondary cure using an activator
  • Application: Threadlocking
  • Strength: Medium

LOCTITE® 243™ is a medium-strength, blue threadlocker designed for locking and sealing threaded fasteners. It cures in the absence of air between close-fitting metal surfaces, preventing loosening and leakage due to vibration or shock. It provides reliable performance on both active metals (e.g., brass, copper) and passive substrates (e.g., stainless steel, plated surfaces). The product is oil-tolerant and suitable for use on fasteners in pumps, gearboxes, motors, and vehicles.


2. Applications

  • Locking and sealing threaded fasteners
  • Suitable for use on pumps, gearboxes, motors, and vehicles
  • Works on various metals, including stainless steel and plated surfaces
  • Resistant to minor surface contamination from lubricants and protective fluids

3. Typical Properties

Property Value
Uncured Properties
Specific Gravity (@ 23°C) 1.08
Viscosity (Brookfield RVT, 25°C) 2,000 mPa·s (cP)
Viscosity (Cone & Plate, 25°C) 350 mPa·s (cP)
Cured Properties (24 hours @ 23°C)
Glass Transition Temperature (Tg) 100°C
Coefficient of Thermal Expansion Below Tg: 80×10⁻⁶ K⁻¹, Above Tg: 90×10⁻⁶ K⁻¹
Thermal Conductivity 0.1 W/(m·K)
Specific Heat 0.3 kJ/(kg·K)
Adhesive Properties (72 hours @ 23°C)
Breakaway Torque (M10 black oxide bolts & mild steel nuts) 26 N·m (230 lb·in)
Prevail Torque (M10 black oxide bolts & mild steel nuts) 5 N·m (40 lb·in)
Breakloose Torque (M10 black oxide bolts & mild steel nuts) 24 N·m (210 lb·in)
Compressive Shear Strength (Steel pins & collars) 7.6 N/mm² (1,100 psi)

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