LOCTITE® 263

Features and Benefits

Designed for high-strength permanent locking and sealing of threaded fasteners. Removable with heat.
LOCTITE® 263 is a red, high strength, primerless threadlocker for permanently locking and sealing bolts, nuts and studs to prevent loosening due to vibration. It works on all metals without primer, including passive substrates such as stainless steel, aluminum and plated surfaces. Suitable for use on most oil-coated, 'as-received' fasteners without cleaning.
  • Ideal for heavy duty applications, such as studs into motor housings, where high strength is required
  • Prevents fastener loosening and leakage from shock and vibration
  • Permanent locking and sealing of threaded fasteners - removable with heat
  • Requires heat for disassembly
  • High temperature performance (up to 182°C / 360°F) and oil tolerance
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Technical Information

Agency approvals / certificates / specifications NSF/ANSI-norm 61
Application method Dispense system, Manual
Application temperature -65.0 - 360.0 °F (-55.0 - 180.0 °C )
Applications Threadlocking
Breakaway torque, M10 Steel Nuts/Bolts 33.0 N·m (290.0 in./lb. )
Color Red
Cure type Anaerobic cure
Fixture time 10.0 min.
Key characteristics Disassembly: disassembly with heat, Fluorescent, General purpose, Oil tolerant, Primerless, Strength: high strength
Physical form Liquid
Prevail torque, M10 Steel Nuts/Bolts 33.0 N·m (290.0 in./lb. )
Recommended for use with Metal, Metal: passive metal
Specific gravity, @ 25.0 °C 1.1
Viscosity, 20 RPM 500.0 mPa·s (cP)

How to

Step by Step Guide

1. Preparation - Cleaning

LOCTITE® 263 is suitable for use on most “as-received” fasteners with light coatings of corrosion prevention oils without cleaning. However, for heavily oiled or contaminated fasteners, it is recommended to use LOCTITE® SF 7070 to degrease and clean surfaces prior to applying LOCTITE 263 threadlocker.

2. Preparation - Activation

If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use LOCTITE SF 7649 activator. Allow to dry.

3a. Application - Through Hole

Apply a few drops of liquid threadlocker to the thread engagement area. Assemble nut and tighten to proper torque.

3b. Application - Blind Hole

Apply several drops of liquid threadlocker into lower third of blind hole, as well as a few drops onto male threads, and then install male threads. Tighten to proper torque.

4. Assembly

Assemble and tighten to proper torque requirement. If several bolts are being assembled, torque them down to the correct value within the fixture time window.

5a. Disassembly - Hand Tools

Disassemble with standard hand tools.

5b. Disassembly - Heat

If disassembly is not possible using normal hand tools, apply localized heat to approximately 500°F/260°C. Disassemble while hot with standard hand tools.

Equipment

For manual dispensing, the use of LOCTITE® EQ Pro Pump (for 50ml and 250ml bottles) or LOCTITE® Peristaltic Hand Pumps (50 ml or 250 ml versions) is recommended to ensure a consistent application volume.

Hint

For the disassembly of corroded or seized parts, use LOCTITE® LB 8040 Freeze and Release.

Frequently Asked Questions