LOCTITE 243 is a medium-strength, oil-tolerant threadlocker used by composite and assembly manufacturers to secure bolted and threaded connections against vibration loosening. For FRP factories, pultrusion lines, and equipment assembly operations that need a reliable, removable threadlocking solution, LOCTITE 243 is formulated to cure on metal threads without requiring a primer in most applications.
Typical Properties of LOCTITE 243
Buyers evaluating this threadlocker for a new sourcing relationship should reference the physical properties listed below alongside the current Safety Data Sheet before specifying it into an assembly procedure.
| Property | Typical Value |
|---|---|
| Specific Gravity @ 25°C | 1.08 |
| Flash Point | See SDS |
| Viscosity, Brookfield RVT @ 25°C (Spindle 3, 20 rpm) | 1,300 to 3,000 mPa·s |
| Viscosity, Cone & Plate @ 25°C (Cone 35/2 @ 129 s⁻¹) | 350 mPa·s |
How LOCTITE 243 Is Applied for Assembly
For best results, all surfaces should be cleaned with a LOCTITE cleaning solvent and allowed to dry before application. If cure speed needs to be faster, an appropriate activator can be used and allowed to dry when needed. It should be shaken thoroughly before use, and the applicator tip should not touch metal surfaces during application to prevent clogging.
For thru holes, several drops are applied onto the bolt at the nut engagement area. For blind holes, several drops are applied to the lower third of the internal threads or the bottom of the hole. For larger male fittings, a 360-degree bead is applied to the leading threads, leaving the first thread free, and the material is forced into the threads to fill voids; for bigger threads and voids, the amount is adjusted and a bead can also be applied to the female threads. Parts are then assembled and tightened as required.
Disassembly and Clean-Up
Assemblies secured with this threadlocker can typically be removed with standard hand tools. In rare cases where hand tools are not sufficient because of excessive engagement length, localized heat of approximately 250°C can be applied to the nut or bolt, with disassembly performed while hot. Cured product residue can be removed by soaking in a LOCTITE solvent combined with mechanical abrasion, such as a wire brush.
Why Sourcing Consistency Matters
Inconsistent threadlocker viscosity or cure behavior can lead to loose fasteners, rework, or assembly line delays across FRP pipe and tank, pultrusion, and equipment manufacturing operations. Buyers who source this product through a documented supply chain reduce the risk of receiving mismatched batches with inconsistent viscosity or cure speed.
Where to Source LOCTITE 243
Composite material buyers and assembly manufacturers can source this threadlocker and related auxiliary agent products through Thousands Technology’s supply chain resource support, which helps FRP factories, boat builders, and pultrusion manufacturers maintain consistent access to recommended international brand products. For handling and safety classification references used across manufacturing operations, buyers can also review ASTM standards and publications.
Documentation
Before specifying this product into a production process, buyers should request the current Technical Data Sheet and Safety Data Sheet to confirm viscosity, cure speed, and handling requirements for their specific fastener sizes.
Frequently Asked Questions
What is LOCTITE 243 used for?
It is used as a medium-strength threadlocker to secure bolted and threaded metal connections against vibration loosening in assembly operations.
Does LOCTITE 243 require a primer?
It is designed to cure on threads without a primer in most applications, though an activator can be used if faster cure speed is needed.
How is a threaded connection disassembled after using LOCTITE 243?
Most connections can be removed with standard hand tools; if engagement length is excessive, localized heat of about 250°C can be applied to the fastener before disassembling while hot.
Where can I get technical support for sourcing LOCTITE 243?
Buyers can request the current TDS and SDS and reach out through Thousands Technology’s supply chain resource support for sourcing guidance on LOCTITE 243 and related assembly products.
Ready to source LOCTITE 243 for your next assembly run? Contact our team to request documentation, discuss packaging options, and get supply chain resource support for your production schedule.
