Loctite Solutions for Bonding, Sealing, Threadlocking & Repair

Loctite is a globally recognized range of high-performance adhesives, threadlockers, retaining compounds, sealants, and maintenance solutions for demanding industrial applications. At Si Concepts, we offer a wide range of products for manufacturing, engineering, automotive, maintenance, repair, and industrial assembly. Whether you need bonding adhesive, a threadlocker, a retaining compound, or a sealant, it offers specialized solutions.

Loctite® Threadlockers (Nut, Bolt & Screw Locking)

Loctite Threadlockers: Loctite Threadlockers are anaerobic adhesives used to secure threaded fasteners, prevent loosening from vibration and shock, and help protect threads against corrosion and leakage.
Threadlocker type and Applications
Loctite 222 – Low strength
Small screws, adjustment screws and fasteners requiring easy disassembly
Loctite 242- Medium strength
General-purpose nuts, bolts and threaded fasteners
Loctite 243 – Medium strength, oil tolerant
Automotive and industrial fasteners where light oil contamination may be present
Loctite 263 – High strength
Heavy-duty bolts and threaded assemblies requiring strong locking
Loctite 270: – High strength
Permanent locking of studs, nuts and bolts
Loctite 271: – High strength
Critical and permanent threaded assemblies
Loctite 272: – High-temperature, high strength
Fasteners exposed to elevated operating temperatures
Loctite 277:- High strength
Large-diameter bolts and studs in heavy machinery
Loctite 290: – Wicking grade
Locking pre-assembled fasteners; penetrates into existing threads

LOCTITE Retaining Compounds are high-performance anaerobic adhesives designed to secure cylindrical metal components. They fill the clearance between mating surfaces, increasing assembly strength and helping prevent loosening, fretting and corrosion.
Product & Typical Application
Loctite 603
Retaining bearings, bushes, sleeves and cylindrical components with close fits
Loctite 609
Securing bearings, bushings, sleeves and other cylindrical parts
Loctite 620
High-temperature retaining applications such as bearings, bushings and shafts
Loctite 638
High-strength retention of shafts, gears, bearings and cylindrical assemblies
Loctite 641
Retaining components where future disassembly may be required
LOCTITE 648
High-strength retention of bearings, gears, bushes and shafts; suitable for demanding assemblies
Common Applications
Shaft-to-hub assemblies
Bearings and bearing housings
Bushes and sleeves
Gears and pulleys
Rotors and cylindrical components
Repairing worn or loose cylindrical fits
Preventing fretting and movement between mating components

Loctite Instant Adhesives are fast-curing cyanoacrylate adhesives designed for quick, strong bonding of a wide range of materials. Different grades are available for plastics, rubber, metals, porous materials and demanding industrial applications.
Product
Type / Key Feature & Typical Applications
Loctite 401
General-purpose, low viscosity
Metal, rubber, plastics, wood and porous materials
Loctite 406
Fast bonding, especially plastics & rubber
Plastic-to-plastic and rubber-to-plastic assemblies
Loctite 408
Low-odor / low-bloom type
Cosmetic assemblies, plastics and sensitive applications
Loctite 414
Fast general-purpose adhesive
Plastics, metals and rubber components
Loctite 415
High-strength, gap-filling capability
Metal and rigid material assemblies
Loctite 435
Toughened instant adhesive
Impact/vibration-resistant bonding of metal, rubber and plastics
LOCTITE 480
Rubber-toughened
Rubber, metal and plastic assemblies requiring improved impact resistance
LOCTITE 495
General-purpose, fast curing
Metal, rubber and plastic bonding
LOCTITE 454
Gel, non-dripping
Vertical or overhead bonding and porous surfaces
Common Applications
Plastic-to-plastic bonding
Rubber bonding
Metal-to-metal and metal-to-rubber bonding
Ceramic and other rigid-material bonding
Small component assembly and repairs
Electrical and electronic component assembly
Automotive and industrial manufacturing
Quick maintenance and repair applications

Loctite Thread Sealants are anaerobic sealants designed to seal threaded pipe and fitting connections, helping prevent leakage of gases, water, oils, fuels and other fluids. They also provide resistance to vibration and corrosion in suitable applications.

Common Applications

• Hydraulic and pneumatic pipe fittings
• Pumps, valves and compressors
• Water and gas piping
• Fuel and oil lines
• Industrial process piping
• Plumbing and maintenance applications
• Sealing tapered and parallel threaded connections

Key benefits: leak prevention • vibration resistance • corrosion protection • easy application • reliable sealing of threaded connections.

LOCTITE Flange Sealants are anaerobic or silicone-based sealing solutions designed to prevent leakage between mating flange surfaces. They provide reliable sealing against oils, coolants, gases and other fluids while helping compensate for surface imperfections.
Product
Type / Key Feature
Typical Applications
Loctite 515
Flexible anaerobic flange sealant
Rigid metal flanges, engine components, pumps and machinery housings
Loctite518
High-performance anaerobic flange sealant
Close-fitting rigid metal flanges, gearboxes, transmission housings and engine assemblies
Loctite 510
High-temperature flange sealant
Rigid metal flanges exposed to elevated temperatures
Loctite 574
Fast-curing flange sealant
Precision-machined metal flanges and rigid flange assemblies
Loctite SI 5910
Silicone flange sealant
Flexible flange sealing, oil pans, covers and stamped-metal assemblies
LOCTITE SI 5699
Silicone flange sealant
Flange sealing applications requiring resistance to water, oils and other fluids
Common Applications
Engine and transmission housings
Gearboxes and machinery casings
Pumps and compressors
Oil pans and covers
Rigid metal flange assemblies
Industrial equipment and maintenance
Replacing conventional cut gaskets in suitable applications
Key benefits: reliable leak prevention • gap filling • vibration resistance • reduced gasket inventory • excellent sealing of mating flange surfaces.

Loctite silicone sealants are flexible, durable sealing solutions designed for flanges, joints, housings, covers and other assemblies exposed to vibration, temperature changes, moisture, oils and environmental conditions. They are widely used in automotive, industrial equipment, machinery and maintenance applications.
Loctite Product Type / Key Feature
Typical Applications
Loctite SI 596
High-performance silicone sealant; flexible and heat resistant
Engine components, pumps, machinery housings, covers, flanges
Loctite SI 5910
Low-strength, flexible silicone flange sealant
Oil pans, transmission covers, stamped-metal flanges, engine SI 5699
Silicone flange sealant with good resistance to water, oils and fluids
Engine/transmission flanges, machinery housings, pumps and industrial equipment
Loctite SI 5970
Silicone-based gasket maker/sealant
Automotive and industrial flange sealing, covers and housings
Loctite SI 5900
Silicone sealant/gasket maker for flexible sealing
Large flange surfaces, engine and machinery assemblies
Loctite SI 595
General-purpose silicone sealant
General industrial sealing, joints, housings and maintenance
Common Applications
Engine and transmission sealing
Oil pans and valve covers
Gearbox and machinery housings
Pump and compressor housings
Flange and joint sealing
Stamped-metal components
Automotive maintenance and repair
Industrial equipment maintenance
Sealing against moisture, oils and environmental contaminants
Key Benefits
Flexible sealing for assemblies subject to vibration and thermal movement
Helps prevent oil, water and fluid leakage
Excellent adhesion to many common substrates
Fills surface irregularities and flange imperfections
Suitable for many automotive and industrial maintenance applications
Can replace conventional formed gaskets in suitable applications

Loctite metal repair putties are two-component epoxy-based repair compounds designed for rebuilding, repairing and restoring worn or damaged metal components. They are suitable for maintenance and repair applications where machining, welding or replacement may be difficult or costly.
Loctite Product, Type / Key Feature & Typical Applications
Loctite EA 3478
High-performance epoxy metal repair compound
Rebuilding worn shafts, housings, keyways, machine components and metal surfaces
Loctite EA 3473
Fast-curing metal repair epoxy
Emergency repairs, damaged metal parts, housings, pipes and machinery components
Loctite EA 3471
Steel-filled epoxy repair compound
Repairing cracks, holes, worn surfaces and damaged metal components
Loctite EA 3475
Aluminium-filled epoxy repair compound
Repairing aluminium components, housings, castings and equipment
Loctite EA 3463
Steel-filled epoxy repair stick/putty
Quick repairs of pipes, tanks, housings, machinery and metal surfaces
Common Applications
Repairing cracks, holes and damaged metal surfaces
Rebuilding worn shafts and housings
Repairing keyways and machine components
Restoring worn bearing seats
Repairing pumps, valves and industrial equipment
Rebuilding damaged castings
Repairing pipes, tanks and metal structures
Filling pits, voids and surface imperfections
Maintenance and emergency industrial repairs
Key Benefits
Strong epoxy-based metal repair
Helps restore damaged or worn components
Can be shaped, drilled, tapped or machined after curing, depending on the grade
Reduces equipment downtime
Useful for maintenance and emergency repairs
Available in different formulations for steel, aluminium and specialized repair requirements

Loctite ® products are engineered to provide reliable performance in demanding assembly and maintenance environments. Depending on the product, Loctite ® solutions can provide:
Strong and reliable bonding
Fast curing
Excellent vibration resistance
Thread locking and anti-loosening performance
Reliable sealing
Cylindrical retaining
Resistance to oils and industrial fluids
Temperature-resistant solutions
Reduced maintenance requirements
Improved assembly reliability

Not sure which Loctite® product you need## How to Select the Right Loctite Product for Your Application Tell us the materials being joined or sealed. Tell us the application type. Tell us the operating temperature. Tell us the required bond strength. Tell us the gap size. Tell us about exposure to oil, chemicals, or moisture. Tell us the required curing time. Additionally, our team can help you identify a suitable Loctite® solution for your application.

What is Loctite® used for?
Loctite ® is a range of adhesives, threadlockers, retaining compounds, sealants and other engineering products used for bonding, securing, sealing and maintaining industrial assemblies.
Which Loctite ® is best for metal bonding?
The appropriate product depends on the metals, joint design, gap, temperature and required strength. Loctite ® offers different solutions for structural bonding, retaining and other metal assembly applications.
Which Loctite ® is used for threadlocking?
Loctite ® offers different threadlockers for removable, medium-strength and high-strength applications. Products such as LOCTITE® 242, 243, 262, 263, 270 and 271 are commonly selected according to the application requirements.
Which Loctite ® is used for retaining bearings?
Loctite ® retaining compounds such as 603, 609, 638, 641 and 648 are designed for different cylindrical retaining applications. The correct selection depends on the assembly, clearance, temperature and required strength.
Can Loctite ® be used for plastic and rubber?
Yes. Certain LOCTITE® instant adhesives are formulated for plastics and/or rubber. Product selection should be based on the specific substrate and application.

Looking for Loctite ® adhesives, threadlockers, retaining compounds or sealants in India?
Si Concepts supplies a wide range of Genuine Loctite ® industrial products for professional, engineering and maintenance applications.
Contact Si Concepts for product availability, technical guidance and suitable Loctite ® solutions for your application.