LOCTITE® 401 Instant Adhesive
This high-performance, one-part instant adhesive is designed for fast, reliable bonding across a wide variety of materials. It cures quickly, even on surface-insensitive substrates, and delivers excellent shear and tensile strength for strong, long-lasting joints.
Perfect for industrial and general assembly applications, this adhesive works especially well on close-fitting parts where uniform stress distribution is essential. With the help of LOCTITE SF 770 primer, it can also bond traditionally difficult materials such as PP, PE, and PTFE with confidence.
It’s not limited to hard surfaces either—this adhesive performs exceptionally well on porous materials like wood, paper, leather, and fabric, making it a truly versatile solution.
Why choose this adhesive?
Fast-fixturing for quick assembly
Very high bond strength on close-fitting components
Safer formulation with reduced hazardous ingredients
Bonds a wide range of similar and dissimilar materials, including metals, rubber, plastics, ceramics, wood, and cardboard
Capable of bonding hard-to-bond plastics when used with the appropriate primer
A dependable, all-purpose instant adhesive built for performance, safety, and versatility.
LOCTITE® 406 Instant Adhesive
This one-part instant adhesive features an exceptionally low viscosity, allowing it to flow easily into the smallest gaps and create an ultra-thin, high-strength bond within seconds. It’s specially formulated for fast, reliable bonding of plastics and elastomeric materials.
Ideal for precision assemblies, this adhesive fixes components almost instantly and cures rapidly to form a neat, invisible bond line. When used together with LOCTITE SF 770 primer, it can also bond difficult-to-bond materials such as PP, PE, and PTFE with ease.
Key benefits
Extremely fast fixture time on plastics and rubber, including EPDM
Ultra-low viscosity for excellent capillary action and very small gaps
Enables bonding of challenging materials when used with a suitable primer
Safer formulation with reduced hazardous ingredients for better workplace safety
A perfect choice when speed, precision, and clean bonding are essential.
LOCTITE® 242 Instant Adhesive
LOCTITE® 242 is a versatile threadlocking adhesive that provides dependable holding power without making removal difficult. With its medium strength and smooth application, it securely locks fasteners in place while preventing loosening caused by vibration. It is specially designed to stay where applied and can be easily removed later using regular hand tools, making it a practical and user-friendly solution for everyday fastening needs.
- Fast fixture
- Medium viscosity
- Medium strength
- Thixotropic for ease of application
Technical specification :
Technical specification :
LOCTITE® 243 Instant Adhesive
LOCTITE® 243 is a blue, general-purpose thread locker designed to deliver a dependable medium-strength hold. It works effectively on all types of metals—no primer needed—including stainless steel, aluminum, and plated fasteners. One of its biggest advantages is that it cures reliably even on fasteners with light oil or cutting fluid residues, saving time by reducing the need for intensive cleaning before application.
- Prevents fastener loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
- Works on all metals, including passive substrates
- Suitable for use on most ‘as-received’ fasteners without aggressive cleaning
- Can be disassembled with ordinary hand tools for easy service and maintenance
- NSF/ANSI 61 certified
WARNING!
Cancer and Reproductive Harm www.P65Warnings.ca.gov
LOCTITE® 270 Instant Adhesive
LOCTITE® 270 is a high-strength threadlocker designed for applications where fasteners must stay locked permanently. It securely seals and holds bolts, nuts, and studs in place, preventing loosening caused by heavy shock and vibration. Suitable for all metals—including stainless steel, aluminum, and plated surfaces—it delivers reliable performance even on fasteners with light oil residues or minor surface contamination, without requiring extensive cleaning.
When absolute security is essential, LOCTITE® 270 is a dependable solution. It provides maximum locking and sealing strength without the need for primers or surface activators. While the bond is designed to be permanent, disassembly is still possible by applying heat up to 300°C (572°F) and removing the fastener while hot.
- High strength
- Prevents loosening on vibrating assemblies, e.g. pumps, gear boxes, presses
- Able to cure through light coatings of oils without cleaning
- Works on all metals without a surface activator or primer, including passive substrates
- NSF P1 Reg. No. 123006
Technical specification :
| Agency approvals / certificates / specifications | NSF P1 Reg. No 123006 |
| Application temperature | -55.0 – 180.0 °C (-65.0 – 360.0 °F ) |
| Applications | Threadlocking |
| Breakaway torque, M10 Steel Nuts/Bolts | 33.0 N·m (290.0 in./lb. ) |
| Colour | Green |
| Fixture time | 10.0 min |
| Key characteristics | General purpose, Strength: high strength |
| Prevail torque, M10 Steel Nuts/Bolts | 33.0 N·m (290.0 in./lb. ) |
| Recommended for use with | Metal: brass, Metal: steel, Metal: steel – stainless steel |
| Viscosity, 20 RPM | 500.0 mPa·s (cP) |
LOCTITE® 641 Instant Adhesive
For applications where parts need to be removed and serviced regularly, LOCTITE® 641 is a practical and reliable choice. This medium-strength retaining compound is ideal for securing bearings on shafts and inside housings while still allowing easy disassembly when required. It cures anaerobically between closely fitted metal surfaces, helping prevent loosening and leakage caused by shock and vibration.
Medium strength designed for easy removal
Perfect for components that require frequent maintenance
Supports secondary curing when used with an activator
WARNING!
Cancer and Reproductive Harm www.P65Warnings.ca.gov
Technical specification :
| Product category | Retaining compounds |
| Technologies | Acrylates, anaerobic cure |
| Color | Yellow |
| Fixture time | 20.0 min |
| Gap fill | 0.15 mm |
| Key characteristics | Strength: medium strength |
| Operating temperature | -55.0 °C – 150.0 °C (-65.0 °F – 300.0 °F) |
| Recommended for use with | Metal: steel |
| Shear strength, Steel | 12.0 N/mm² (1700.0 psi) |
| Viscosity | 600.0 mPa·s (cP) |
WARNING!
Cancer and Reproductive Harm www.P65Warnings.ca.gov
LOCTITE® 577 Instant Adhesive
When you need a dependable, all-purpose thread sealant that performs reliably under high temperatures and less-than-perfect surface conditions, LOCTITE® 577 is an excellent choice. It is specially formulated for sealing and locking threaded metal pipes and fittings, delivering an instant low-pressure seal without creeping, shrinking, or tearing over time. The product works exceptionally well on both active and inactive metals, including stainless steel, with no surface activator required.
LOCTITE® 577 offers gap-filling capability up to 0.25 mm (0.01″) and cures effectively even when light residues from oils, cutting fluids, corrosion protection agents, or cleaning solutions are present. This makes it a practical and time-saving solution for demanding industrial and maintenance applications.
Additionally, it meets the performance requirements of KIWA GASTEC QA AR 214 for gas admixtures up to 100% hydrogen, with certification available in select countries.
- Excellent chemical resistance
Technical specification :
WARNING!
Cancer and Reproductive Harm www.P65Warnings.ca.gov
LOCTITE® 638 Instant Adhesive
When you need a high-strength retaining compound that works reliably on all metals—including passive substrates—LOCTITE® 638 is a powerful solution. It delivers excellent performance at high temperatures, offers strong resistance to oils, and features a fast fixture time of around four minutes. With gap-filling capability between 0.15 mm and 0.25 mm (0.006″ to 0.01″), it ensures secure bonding even where slight clearances exist.
Thanks to its high-viscosity formula, LOCTITE® 638 is ideal for securing cylindrical parts such as shafts, gears, and pulleys. It also performs effectively in high-strength threadlocking and thread-sealing applications. The product cures reliably even in the presence of minor surface contamination, including industrial oils, and operates across a wide temperature range from -55°C to 180°C (-65°F to 355°F).
LOCTITE® 638 meets the performance requirements of KIWA GASTEC QA AR 214 for metal threaded fittings with gas admixtures up to 100% hydrogen, with certifications available in select countries.
- Ideal for shafts, gears, pulleys and similar cylindrical parts