Applications

3M™ Scotch-Weld™ Threadlocker TL42, Blue, One-Component Anaerobic Adhesive

  • Item No: TL42
  • Manufacturer: 3M™ Scotch-Weld™
  • Technologies: Anaerobic Adhesive
  • Color: Blue
  • Cure Type: Anaerobic
  • Package Sizes: 10 mL (0.33 fl oz) bottle, 50 mL (1.69 fl oz) bottle, 250 mL (8.45 fl oz) bottle
  • Shelf Life: 18 months

Product Description

3M™ Scotch-Weld™ Threadlocker TL42 is a medium-strength, removable one-component anaerobic adhesive designed for locking and sealing threaded fasteners. It cures in the absence of air between close-fitting metal surfaces, providing excellent resistance to vibration, corrosion, and shock. This threadlocker prevents loosening and leakage while allowing for disassembly with standard hand tools​.


Key Features

  • Medium Strength: Securely locks threads but allows for disassembly with hand tools.
  • Prevents Corrosion: Seals threads to protect against rust and leakage.
  • Shock and Vibration Resistant: Suitable for use in high-vibration environments.
  • Fluorescent Under UV Light: Aids in quality inspection.
  • Fast Curing: Handling strength achieved in approximately 20 minutes on average.
  • Temperature Resistance: Withstands continuous exposure to -54°C to 149°C (-65°F to 300°F).

Recommended Applications

  • Threadlocking of machine tool access bolts and hydraulic system bolts.
  • Securing gear box/driveshaft bolts, bearing cover cap screws, and conveyor roller bolts.
  • Preventing fastener loosening due to vibration and mechanical stress.
  • Applications requiring medium strength threadlocking with easy removability.

Technical Data

Typical Uncured Physical Properties

Attribute Name Test Method Value
Color Blue¹
Viscosity Brookfield Viscometer, spindle #3 at 20 rpm 800 – 1,600 cP²
Chemistry Dimethacrylate
Fixture Time ISO 10964 20 min (avg), range: 10–30 min³

¹ Color may vary from nearly white to yellow/amber; performance is not affected.
² Measured using Brookfield Viscometer.
³ Reference ISO 10964​.


Typical Cured Characteristics

Attribute Name Value
Cured Color Blue
Temperature Resistance (Long-Term) -54°C to 149°C (-65°F to 300°F)

Typical Performance Characteristics

Attribute Name Test Method Value
Breakaway Torque ISO 10964 140 in-lb (range: 70–200 in-lb)¹
Prevailing Torque 100 in-lb (range: 20–200 in-lb)¹
Long-Term Temperature Resistance 149°C (300°F)²
Minimum Long-Term Temperature Resistance -54°C (-65°F)²

¹ Reference ISO 10964. To convert in-lb to N·m, divide by 8.851.
² Long-term exposure over days or weeks​.

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