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$606.29
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Loctite 242 Blue Threadlocker is a medium‑strength, thixotropic adhesive in a 50 mL bottle to lock and seal threaded fasteners that remain serviceable with hand tools.
The Loctite 242 blue threadlocker is a professional-grade, medium‑strength threadlocking adhesive designed to lock and seal threaded fasteners in environments exposed to vibration and shock. It cures anaerobically between close-fitting metal surfaces to prevent loosening, leakage, corrosion, and fastener failure while remaining serviceable with common hand tools—a key advantage for maintenance and repair operations.
Ideal for bolts and nuts with diameters between 6 mm and 19 mm (M6–M19), this blue formula is engineered to provide reliable performance on steel, brass, stainless, and plated surfaces. It supports standard disassembly, unlike higher-intensity permanent threadlockers that require heat. Its thixotropic consistency reduces run‑off after application, delivering accurate, controlled dispensing.
Cure sets in 5–20 minutes, depending on temperature and substrate, and achieves full strength within 24 hours at room temperature. Resistant to moisture and most common shop fluids, the Loctite 242 blue threadlocker is ideal for automotive assemblies, pump or motor mounting bolts, equipment housings, and machinery fasteners. It meets Mil‑S‑46163A Type II Grade N and ASTM D5363 Group 3 Class 2 Grade 1 standards, giving industrial and military users high confidence in consistency and material traceability.
Medium-strength threadlocker ideal for bolts from M6 to M19 (6–19 mm)
Detachable with standard hand tools, no heat required
Thixotropic to prevent migration
Fast fixture: 5–20 min, full cure in 24 hours
Compatible with various metals including stainless, plated and mild steel
Resists vibration, shock, corrosion and leakage
Meets Mil‑S‑46163A, ASTM D5363 certifications
| Feature | Detail |
|---|---|
| Product | Loctite® 242 Blue Threadlocker |
| Volume | 50 mL bottle (~1.76 oz) |
| Color | Blue |
| Strength | Medium |
| Viscosity | Medium, thixotropic (800–1,600 cP) |
| Thread Size Range | Fasteners 6 mm to 19 mm |
| Fixture Time | ~5–20 minutes |
| Full Cure Time | ~24 hours |
| Temperature Range | −65 °F to +300 °F (−55 °C to +150 °C) |
| Tensile Strength | ~110 psi (~0.75 MPa) |
| Specific Gravity | ~1.10 @ 25 °C |
| Shelf Life | ~2 years (~730 days) |
| Standards Compliance | Mil‑S‑46163A Type II Grade N, ASTM‑D5363 |
| Weight (bottle only) | ~0.09 kg (~0.2 lb) |
Industrial equipment bolts
Automotive component fastening under vibration
Prevent loosening in compressors, pumps, motors
General maintenance requiring reusability
Thread sealing in chemical or moisture-prone environments
Ensure surfaces are free of oil, rust, or dirt before application.
Apply a single drop or bead to the female thread.
Assemble parts and tighten with normal torque.
Avoid over-tightening to ensure proper cure.
Disassembly is possible with hand tools; heating may be used in rare cases.
For faster cure on difficult metals, apply Loctite activator.
Store in a cool, dry location and reseal bottle after each use.
Balanced medium strength—locks securely while allowing disassembly
Proven in industrial, automotive, and maintenance applications
Reliable curing on plated, passive metal surfaces
Robust technical certification and brand trust by Henkel / Loctite
