Description
Loctite 243 is a blue, one component acrylic (dimethacrylate ester) threadlocker from Henkel that cures anaerobically, meaning it hardens when confined without air between close fitting metal surfaces.
It is aimed at fasteners in equipment such as pumps, gearboxes, motors and vehicles that still need to come apart with ordinary hand tools. The data sheet also lists it for sealing threaded fittings.
Technical Specifications
| Technology | Acrylic (dimethacrylate ester) |
|---|---|
| Appearance (uncured) | Blue; fluorescent under UV light |
| Components | One component, no mixing |
| Viscosity | Medium, thixotropic |
| Cure | Anaerobic; activator as secondary cure |
| Specific gravity at 25 degrees C | 1.08 |
| Breakaway torque, unseated, M10 black oxide bolts and mild steel nuts (24 hours at 23 degrees C, ISO 10964) | 22 N·m |
| Breakaway torque, unseated, M6 and M16 black oxide bolts and mild steel nuts (same conditions) | 9 N·m and 50 N·m |
| Compressive shear strength, steel pins and collars (24 hours at 23 degrees C, ISO 10123) | Greater than 7.6 N/mm² |
| Glass transition temperature (24 hours at 23 degrees C) | 100 degrees C |
| Cold strength | Tested to -75 degrees C |
| storage | 8 degrees C to 21 degrees C, unopened and dry |
Where to Use
Intended uses listed on the data sheet:
- Locking threaded fasteners that need normal disassembly
- Sealing threaded fittings
- Pumps, gearboxes, motors and vehicles
- Fasteners on active metals, stainless steel and plated surfaces
How to Apply
- Clean: clean all internal and external surfaces with a Loctite cleaning solvent and allow to dry. Use an activator if the cure will be too slow.
- Shake the bottle thoroughly, and do not let the tip touch metal surfaces, to avoid clogging the nozzle.
- Apply: on through holes put several drops on the bolt at the nut engagement area. For blind holes, apply several drops to the lower third of the internal threads or the bottom of the hole.
- Seal if required: apply a 360 degree bead to the leading threads of the male fitting, leaving the first thread free, and force the material into the threads.
- Assemble and tighten as required. Remove cured product by soaking in a Loctite solvent with mechanical abrasion such as a wire brush.
Important Notes
- Not recommended for use in pure oxygen or oxygen rich systems, and should not be selected as a sealant for chlorine or other strong oxidizing materials.
- Not normally recommended on plastics, particularly thermoplastics where stress cracking could result; confirm compatibility first.
- Where aqueous washing systems clean the parts, check compatibility, as washes can affect cure and performance.
- Storage below 8 degrees C or above 28 degrees C can adversely affect product properties. Do not return used material to the container.
- Consult the Safety Data Sheet for safe handling information.
