Loctite 243/50ml – Medium Strength Threadlock
Loctite 243 is a general purpose threadlocker of medium bond strength. This threadlocker secures and seal bolts, nuts and studs to prevent loosening due to vibration. The product works on all metals, including passive substrates such as stainless steel, aluminium and plated surfaces. It is proven to be tolerant of minor contamination due to industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids.
Loctite 243 is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. The thixotropic nature of Loctite 243 reduces the migration of liquid product after application to the substrate. Loctite 243 provides robust curing performance. It not only works on active metals (e.g. brass, copper) but also on passive substrates such as stainless steel and plated surfaces. The product offers high temperature performance and oil tolerance. It tolerates minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids.
Chemical Type: Dimethacrylate ester
Appearance (uncured): Blue liquid
Fluorescence: Positive under UV light
Components: One component: Requires no mixing
Viscosity: Medium, Thixotropic
Secondary Cure: Activator
Typical Curing Performance
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The graph shown in the data sheet shows the breakaway strength developed with time on M10 steel nuts and bolts compared to different materials and tested according to ISO 10964.
Cure Speed vs. Bond Gap
The rate of cure will depend on the bondline gap. Gaps in threaded fasteners depends on thread type, quality and size. The graph shown in the data sheet shows shear strength developed with time on steel pins and collars at different controlled gaps and tested according to ISO 10123.
Cure Speed vs. Temperature
The rate of cure will depend on the temperature. The graph shown in the data sheet shows the breakaway strength developed with time at different temperatures on M10 steel nuts and bolts and tested according to ISO 10964.
Cure Speed vs. Activator
Where cure speed is unacceptably long, or large gaps are present, applying activator to the surface will improve cure speed. The graph shown in the data sheet shows the breakaway strength developed with time on M10 zinc dichromate steel nuts and bolts using Activator 7471 and 7649 and tested according to ISO 10964.
Typical Properties of Uncured Material
Specific Gravity @ 25°C: 1.08
Viscosity, Brookfield: RVT, 25°C, mPa·s (cP):
–Spindle 3, speed 20 rpm: 1,300 to 3,000
Viscosity, Cone & Plate, 25 °C, mPa·s (cP):
–Cone 35/2°Ti @ shear rate 129: 350
Typical Performance of Cured Material
Cured for 24 hours @ 22 °C
Breakaway Torque, ISO 10964, Unseated:
M10 steel nuts and bolts: N·m 26 (lb.in.) (230)
M6 steel nuts and bolts: N·m 3 (lb.in.) (26)
M16 steel nuts and bolts: N·m 44 (lb.in.) (390)
3/8 x 16 steel nuts and bolts: N·m 12 (lb.in.) (106)
Please store this product in the unopened container in a dry location.
Further storage information may be indicated on the product container labeling.
Use only in well-ventilated areas.
Gloves and safety glasses should be worn.
Prolonged or repeated skin contact should be avoided to minimise any risk of sensitisation.
Store in original containers at 8-21°C (46.4-69.8°F) and do not return residual materials to containers as contamination may reduce the shelf life of the bulk product.
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£26.77Each (exc VAT)