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Loctite 243 is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools.

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Loctite 243 Medium Strength Threadlocker

Silmid P/N: VAR0000744
From £9.00 (excl VAT) £10.80 (Inc VAT)

Loctite 243 is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools.

Data Sheets

Download the Loctite 243 technical data sheet (TDS) and the Loctite 243 safety data sheet (SDS) from Silmid today. Once you have logged in or signed up, select the product size you are interested in and the datasheet will be visible for download if one is available.

Product Properties

Manufacturer Part Number
1335868 | 1335884 | 1335904 | 1918246


NSN Reference
8030-99-253-6699 | 8030-99-834-1892
Airbus CML
Airbus Helicopters CM

Please Note: Specifications and approvals are subject to change at any time. Users should always consult their AMM or the OEM when selecting products to ensure items have the release needed. Only specifications listed on the order confirmation will be certified on the Silmid CofC.

Product Information

The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Particularly suitable for applications on less active substrates such as stainless steel and plated surfaces, where disassembly with hand tools is required for servicing. The thixotropic nature of Loctite-243 reduces the migration of liquid product after application to the substrate.

5 reasons why Loctite 243 is a must have

  1. Strengthens threaded assemblies against vibration by adding approx. 25% to the torque needed to loosen a normally tightened bolt assembly. Reason
  2. One product for locking various sized fasteners, versus an inventory of different sized mechanical locking devices you would otherwise need to keep (saves both money and space).
  3. It’s suitable for active and inactive substrates. Do note though that activator LOCTITE SF 7649 is needed on inactive surfaces.
  4. It’s tolerant to minor oil contamination, curing on as-received fasteners without cleaning, or on parts that aren’t easily accessible for thorough cleaning during maintenance.
  5. Assemblies locked by LOCTITE 243 can be easily disassembled when needed, using ordinary hand tools.


  • Prevents loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
  • Works on all metals, including passive substrates (e.g. stainless steel, aluminium, plated surfaces)
  • Proven to tolerate minor contamination by industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids
  • Permits disassembly with hand tools for servicing

Technical Details:

  • Chemical Type Dimethacrylate ester
  • Appearance (uncured) Blue
  • Fluorescence Positive under UV light
  • Components One component - requires no mixing
  • Viscosity Medium, thixotropic
  • Cure Anaerobic
  • Secondary Cure Activator
  • Application Threadlocking
  • Strength Medium
Product Video

Additional Content

Loctite Threadlocker Application
Loctite Threadlocker Application
Loctite Threadlocker Selection
Loctite Threadlocker Selection
Henkel Brochures
Henkel Brochures

Shipping information

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International delivery (door to door delivery) is available for selected countries worldwide. Shipping will be automatically calculated based on the weight, location and hazardous nature of the goods. Customers can also choose ex works to arrange their own collection.

Please refer to our delivery page for more information.