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Small green bottle of Loctite 290 wicking threadlocker

Loctite

Loctite 233731 Wicking Threadlocker Green Medium Strength 0.34 fl oz

SKU CH-4KN2-H33XM

Wicking anaerobic threadlocker seals metal fasteners up to 1/2 inch with 90 in-lb breakaway torque and 20 minute working time

  • ColorGreen
  • Wicks into assembled fasteners without disassembly
  • Medium strength holds 90 in-lb breakaway torque
  • Cures anaerobically in 20 minutes working time
  • Green colour identifies Series 290 formulation
  • Meets ASTM D-5363 and MIL-S-46163-A standards

Threadlocking for metals up to 1/2 in

Loctite 290 is a green, medium-strength anaerobic threadlocker designed for brass, bronze, copper, iron, manganese, Monel, nickel and steel fasteners. Its wicking formulation penetrates pre-assembled threads without disassembly. The 0.34 fl oz bottle suits maintenance and repair tasks where bolts are already in place. It meets ASTM D-5363 and MIL-S-46163-A specifications.

Anaerobic cure develops full strength over time

The adhesive cures in the absence of air between close-fitting metal surfaces, reaching a breakaway torque of 90 in-lb. Fixturing occurs within 20 minutes at room temperature, allowing alignment before full lock sets. Sustained vibration and thermal cycling are resisted once the anaerobic polymer matrix cross-links completely. Compatible primer 7649 can accelerate cure on inactive or plated metals.

Replaces mechanical locking devices on installed

This threadlocker upgrades from lock washers, nylon patches or safety wire when disassembly is impractical. The jump is worth it for assemblies requiring reusable, vibration-proof sealing on diameters up to 1/2 in where future adjustment with hand tools remains necessary. It is not suited for large-diameter structural bolts, plastic threads, or gaps exceeding the wicking capability.

Highlights

  • Wicks into assembled fasteners without disassembly
  • Medium strength holds 90 in-lb breakaway torque
  • Cures anaerobically in 20 minutes working time
  • Green colour identifies Series 290 formulation
  • Meets ASTM D-5363 and MIL-S-46163-A standards

Specifications

BrandLoctite
ColorGreen

Questions about this item

Does the anaerobic cure generate noticeable heat or fumes during a full day of assembly work?

The anaerobic cure activates only in the absence of air between metal threads, so it does not produce measurable heat or strong fumes during continuous use.

Which primer must I already have on hand for the wicking threadlocker to work on passive metals such as stainless steel?

Loctite 7649 primer is the compatible series specified for use with this threadlocker on less reactive surfaces.

Will the cured adhesive damage brass or bronze fittings I plan to keep in the same assembly?

The product is formulated for brass, bronze, copper, iron, manganese, Monel, nickel and steel, so it will not attack those retained components.

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