LOCTITE 263 is a red, dual cure, acrylic dimethacrylate ester fluorescent threadlocker designed for the permanent locking and sealing of threaded fasteners. It cures between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. It works on active metals (e.g. brass, copper) and passive substrates such as stainless steel and plated surfaces.
  • Designed for the permanent locking and sealing of threaded fasteners
  • Prevents loosening and leakage from shock and vibration
  • Particularly suited for heavy duty applications such as studs into motor housings where high strength is required
  • Provides robust curing performance
  • Offers high temperature performance and oil tolerance

Item number 263
Thread Size
Color Red
mPa.s (cP)
400 ~ 600
Torque Break
33 / 290
Torque Prevail
33 / 290
Temp. Range (℃) -55℃ ~ 182℃
Cure Speed
(Fixture / Full Cure)
4 min. /24 hrs.
Oil Tolerant Good
Primers N or T
Specific Gravity 1.1
Agency Approvals CFIA

  1. With Loctite Primers, it can fill larger gaps.
  2. The screws fixed by the high-strength screw fixing agent can be removed by heating or by using a large torque.
  3. Before use, clean the next part with a rag or steel brush; if there is oil stain, be sure to remove the oil stain first.
  4. If it is a blind hole, it is more appropriate to apply glue to the hole.
  5. If the joint length is long, glue should be applied to the screw and the hole.

LOCTITE 263 Technical Data Sheet

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