H.B. Fuller 42TL

H.B. Fuller 42TL is a thixotropic, anaerobic, blue threadlocker adhesive. It is formulated to cure rapidly and reliably on most "as received" fasteners. It gives predictable lubricity on assembly and is suitable for applications where disassembly with hand tools is required. It also prevents fasteners from loosening. Its typical applications include locking and sealing hydraulic line fittings, vacuum cleaner bell housing screws, hydraulic piston nuts, rocker nuts, oil pressure switch assembly, construction equipment bolts, bulldozer track bolts, railroad bolts on wear plates, carburetor adjusting screws, and machinery keys.

Product Type: 1K (1 component) Adhesive, Anaerobic Adhesive, Solvent free (100% Solids) Sealant

Application Area: Bolts, Fasteners, Screws, Thread

Chemical Family: Polyacrylates

Features: Corrosion Resistant, Rapid Cure Response

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Features and Benefits
  • 100% Solids
  • Bolt Threating Range from 1/4 to 3/4 inch (6 to 20 mm)
  • Prevents Rust and Corrosion
  • Excellent Resistance to Extremely Harsh Environments
  • MIL (S-46163-A) Type II Grade N

Applications & Uses

Application Area
Cure Method
General Instructions

Surfaces to be bonded should be clean and dry and free of grease. Product should be applied in enough quantity to fill all engaged threads or gap. The product performs best in thin bond gaps. Very large gaps may create gaps that will affect the cure speed and overall strength. Good contact is essential. This product is not recommended for use in pure oxygen environments and/or oxygen-rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials. It is recommended to confirm compatibility of the product with all substrates prior to use.


Physical Form
Cured Properties
ValueUnitsTest Method / Conditions
Full Cure Conditions6 - 72h-
Prevailing Torque- 55 - 175°CISO 10964
Service Temperature30 - 100in-lbISO 10964
Breakaway Torque70 - 150in-lb-
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 93°C-
Specific Gravity1.05--

MIL (S-46163-A) Type II Grade N

Technical Details & Test Data

Curing Performance

The rate of cure will depend on environmental conditions and the substrates used. The gap of the bond line will affect set speed. Smaller gaps tend to increase set speed. Activators may be applied to further improve set speed, but may also impair overall adhesive performance.

Storage & Handling

Shelf Life
12 Months
Storage Conditions
  • Storage Temperature: 8 to 28°C.
  • Products should be stored unopened in a cool, dry place out of direct sunlight. Products may be refrigerated for improved shelf life, but should be brought back to room temperature before use.