LOCTITE 243 Primerless, Oil Tolerant, Medium Strength, Removable, Blue Threadlocker

(Known as LOCTITE 243 Blue Threadlocker )

*some package sizes excluded

Threadlocking Adhesive - medium strength. General purpose. Suitable for all metal threaded assemblies.

LOCTITE® 243™ Primerless, Oil Tolerant, Medium Strength, Removable Blue Threadlocker is an oil tolerant, removable, medium strength, blue threadlocker designed for the locking and sealing of threaded fasteners between 1/4" and 3/4" (6 to 20 mm). It not only works on active metals (e.g. brass, copper) but also on passive substrates such as stainless steel and plated surfaces. It tolerates minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids.

LOCTITE 243 is the recommended replacement for LOCTITE® 2440™.

This "Next Generation" threadlocker provides:

  • Upgraded temperature resistance - up to 360°F
  • Oil tolerant curing on as-received fasteners, without cleaning
  • Primerless performance on both inactive and active metals

Learn more about Threadlockers

Your benefits

  • Prevents loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
  • Works on all metals, including passive substrates (e.g. stainless steel, aluminum, plated surfaces)
  • Proven to tolerate minor contamination by industrial oils, e.g. motor oils, corrosion prevention oils and cutting fluids
  • Permits disassembly with hand tools for servicing
  • P1 NSF Reg. No.: 123000

Technical Data Sheets (TDS)

Loctite 243

Product information

IDH# Item Name Size
Case Quantity
Safety Data Sheets
1329467 1329467 LOCTITE 243 Threadlocker
50 ml bottle
10 / case
1329505 1329505 LOCTITE 243 Threadlocker
250 ml bottle
10 / case
1329837 1329837 LOCTITE 243 Threadlocker
10 ml bottle
10 / case
1330255 1330255 LOCTITE 243 Threadlocker
0.5 ml capsule
100 / case
1330333 1330333 LOCTITE 243 Threadlocker
1 l bottle
10 / case