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Blue threadlocker liquid in a 250mL bottle

Vibra-TITE

Vibra-TITE 121 Medium-Strength Threadlocker Blue 250mL

SKU CH-XX3X-MTWHC

Medium-strength threadlocker in a 250 mL bottle prevents loosening from vibration and protects threads against rust while allowing disassembly with hand tools

  • Product typeThreadlockers
  • Color and finishBlue
  • Medium-strength hold keeps fasteners secure under vibration
  • Removable with hand tools for easy maintenance and adjustments
  • Blue liquid formula fills thread gaps up to 0.007 inch
  • Protects assemblies from rust and corrosion damage
  • 250 mL bottle supplies ample threadlocker for multiple jobs

Vibra-TITE 121 Medium-Strength Threadlocker

Vibra-TITE 121 is a medium-strength anaerobic threadlocker supplied in a 250mL bottle. The blue liquid is designed for application to threaded fasteners before assembly to create reliable, vibration-resistant joints. It suits maintenance technicians and assembly operations that require removable fastening security.

Behaviour under sustained vibration

The anaerobic formulation cures in the absence of air to fill gaps up to .007 inches between engaged threads. This creates a solid unitised assembly that resists loosening caused by continuous vibration or shock loading. The cured material also seals the joint against moisture ingress to prevent rust and corrosion over extended service periods.

Practical limits of anaerobic threadlocking

The medium-strength classification allows disassembly using standard hand tools without heat or specialised equipment. Cure speed and final strength depend on substrate material, surface cleanliness and the clearance between mating threads. Large gaps or inactive metals may require a primer for full performance. The product is not intended for permanent locking or structural bonding applications.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $43.99
Pricier than about 77% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameVibra-tite
Product typeThreadlockers
Color and finishBlue

Questions about this item

Does the blue 121 threadlocker generate heat or require power once it has cured on a fastener?

No, the cured threadlocker is a passive anaerobic adhesive; it produces no heat and draws no power during continuous service.

What tools or materials must I already have to apply the 250 mL bottle of 121 threadlocker?

You need clean, dry threads and a way to dispense the liquid — typically a brush, nozzle or dropper — plus hand tools for final assembly and later removal.

Will the .007 in gap-fill of the 121 threadlocker work on older, worn bolts with larger thread clearances?

The product is rated for gaps up to .007 in; worn threads exceeding that clearance may not achieve full locking strength.

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