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3M™ Scotch-Weld™ Threadlocker TL42

3M Product Number  TL42     
3M™ Scotch-Weld™ Threadlocker TL42 Blue provides vibration, corrosion, and shock resistance for fasteners in assembled form. This medium-strength anaerobic adhesive is dispensed as a one-component product.
  • Fills and seals threads completely to help stop corrosion, rust, and leaks
  • Helps maintain torque
  • Removable with hand tools
  • Securely holds dissimilar metals
  • Helps keeps equipment and production up and running
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6 Results (Displaying results 1-6)
3M IDUPCMarketplace Formal NameColorContainer Volume
62349439505000480116260793M™ Scotch-Weld™ Threadlocker TL42 Blue, 250 mL, 2 per caseBlue250 ml  
62349410605000480116260553M™ Scotch-Weld™ Threadlocker TL42 Blue, 0.33 fl oz/10 mL Bottle, 10 per caseBlue  
62349483305000511152512453M™ Scotch-Weld™ Threadlocker TL42 Blue, 1 Litre, 1 per caseBlue1 Litre  
62349410506000480116260553M™ Scotch-Weld™ Threadlocker TL42 Blue, 10 mL, 10 per caseBlue10 ml  
62349401505000480116260483M™ Scotch-Weld™ Threadlocker TL42 Blue, 1 mL, 100 per caseBlue1 ml  
62349450502000480116260623M™ Scotch-Weld™ Threadlocker TL42 Blue, 50 mL, 10 per caseBlue50 ml  
6 Results (Displaying results 1-6)

3M™ Scotch-Weld™ Threadlocker hardens and seals threaded assemblies to dampen vibration and prevent loosening or leakage of secured fasteners. Applying this adhesive to fasteners before tightening seals out moisture and prevents corrosion. Application is fast and easy with just a targeted squeeze of the bottle. The anaerobic formulation begins to cure quickly into a polymer that seals, secures, and retains. The medium strength adhesive loosens when needed with regular hand tools. Scotch-Weld Threadlocker TL42 is effective for locking, vibration dampening, threadlocking, sealing, adhering, gluing, and bonding threaded assemblies. Places where it is useful include machine tool access bolts, and hydraulic system bolts, gear box/driveshaft bolts, bearing cover cap screws, countersunk screws, and conveyor roller bolts. Tested to Military Specification, MIL-S-46163A.

Anaerobic adhesives are uniquely formulated to cure in the absence of oxygen. The term "anaerobic" means "living without air" and when the oxygen is excluded, a chemical chain reaction begins that causes the adhesive to polymerize. Contact with metal speeds the polymerization process and rapidly accelerates the curing process, forming tough cross-linked plastic that provides aggressive adhesion with effective shear strength. More commonly referred to as threadlockers, thread sealants, retaining materials and flange sealants, these adhesives are often used to enhance the seal, or holding force, in the threads of joined fastener systems such as nut-and-bolt assemblies. A nut-and-bolt assembly may have as little as 15 percent metal-to-metal contact and even a small amount of anaerobic adhesive readily fills any air voids between the threads and then hardens to a thermoset plastic. These unique, high-viscosity adhesives are easy to dispense, cure rapidly, and provide effective torque strength while resisting temperature and vibration and sealing out moisture and gasses to protect against corrosion. Anaerobic adhesives can decrease manufacturing costs, enhance equipment reliability, minimize aftermarket breakdown, and reduce warranty claims.


Adhesive TypeDimethacrylate
Breakaway Torque Strength70 to 160 Pound
Consumer LabelNo
Container Volume250 ml, 10 ml, 50 ml, 1 ml, 1 Litre
Full Cure24 Hours @ 72 F (22 C)
IndustriesTransportation, Specialty Vehicle, Construction, Military & Government, General Industrial, MRO, Appliance
Physical FormLiquid
Prevailing Torque Strength20 to 90 Pound
Product FormBottle, Each
Shelf Life in Months (from date of manufacture)12
Storage Temperature72 Degree Fahrenheit
Time to Handling Strength<20 Minute
TypeThread locker
Viscosity Range (cps) at Room Temperature800-1,600