
Best selling Sealants from Loctite
On this page you'll find a ranking of the best Loctite products in this category. To give you a quick overview, we've already ranked the most important information about the products for you.
1. Loctite Thread sealant
Loctite Thread Sealant 542 is a highly effective sealing compound specifically designed for sealing metal threads. This product replaces traditional sealing methods such as hemp, sealing tapes, and pastes, providing a reliable solution for a wide range of applications. The sealant cures in the absence of air between tight metal surfaces, ensuring 100% sealing. It is resistant to a variety of chemicals, including gasoline, oil, and hydraulic fluids, making it ideal for use in hydraulic and pneumatic systems as well as for small screw connections. Thanks to its thixotropic properties, the sealant stays in place after application, allowing for easy handling. The thread sealant is particularly useful in preventing connections from loosening on their own, even under shocks and vibrations. Before application, the threaded surface should be cleaned with a universal cleaner to achieve optimal results.
- Cures in the absence of air and ensures complete sealing
- Prevents self-loosening due to shocks and vibrations
- Thixotropic behavior reduces product migration after application
- Resistant to a variety of chemicals, including gasoline and oil
- Ideal for fine thread connections in hydraulic and pneumatic systems.

2. Loctite 577 Pipe thread seal
Loctite 577 Pipe Thread Sealant is a high performance threadlocker specially developed for sealing threads. Containing 50ml in a convenient tube, this product offers easy application and reliable sealing performance. The paste is suitable for a wide range of applications and ensures effective sealing at temperatures from -50 °C to 150 °C. The yellow colour allows easy identification of the product. Loctite 577 is ideal for use in various industrial and trade applications where a durable and secure bond is required. Maximum temperature resistance of 150 °C. Minimum temperature resistance of -50 °C. Breakaway torque of 9 Nm for reliable connections. Suitable for R3 threads.

3. Loctite Flange sealant
Loctite Surface Sealant Type 510 is a high-strength, anaerobic sealant specifically designed for sealing rigid metal surfaces. This single-component product cures in the absence of oxygen and through contact with metal parts. Its thixotropic property allows the sealant to be applied on vertical surfaces without dripping or running. With a temperature resistance of up to 200 °C and excellent sealing performance, this sealant is ideal for applications where reliable sealing is required. The surface sealant also offers outstanding resistance to oil, water, and glycol, making it a versatile solution for various industrial applications.
- Anaerobic, single-component surface sealant for rigid metal surfaces
- Thixotropic, ideal for vertical applications without dripping or running
- Temperature resistant up to 200 °C
- Excellent resistance to oil, water, and glycol
- Instant sealing effect with a gap sealing capability of up to 0.25 mm.

4. Loctite Flange sealant 518 PEN medium strength
LOCTITE Flange sealant, 518 PEN / 25 ml
Economical, clean product application and complete surface contact thanks to roll-on applicator, single-component, anaerobic curing product, for sealing of surfaces and flanges with large gaps, suitable for sealing of aluminium flanges, high viscosity, quick curing, medium to high strength, remains flexible up to +120°C, 30 % expansion, immediately seal-tight at low pressure loads, supplied in cartridges.

5. Loctite Surface sealant 50 ml
Sealants replace hemp, sealing tapes, and pastes. They are resistant to gases, liquids, air, water, oils, hydrocarbons, and many chemical products. Complete surface contact guarantees 100% tightness. Back-turning or position corrections during assembly before curing can be carried out at any time using conventional tools. Sealant residues do not clog filters and valves.

6. Loctite 55 Thread sealing thread Colour We
Loctite's Thread Sealant 55 is a versatile sealing material specifically designed for sealing metal and plastic pipe thread connections. This product meets the requirements for use with drinking water and gas, providing an immediate sealing effect without any curing time. The thread sealant is easy to handle and allows for precise assembly, even under challenging conditions, as it works independently of ambient temperature. The practical dispenser box ensures quick and clean application, while its high resistance to heat, cold, chemicals, gas, water, and steam guarantees reliable sealing. With various approvals, including KTW-D2 for drinking water and DVGW for gas and water, this thread sealant is a safe choice for professional applications.
- Immediate sealing effect without curing time
- Resistant to heat, cold, and chemicals
- Suitable for drinking water and gas with appropriate approvals
- Easy handling with a practical dispenser box
- Adjustable installation by 45° for flexible applications.

Loctite 55 Thread sealing thread Colour We
0.13 kg, White, 160 ml
7. Loctite 396914 EA3463 Verformbares Eisen, Metallpaste 50 g
Loctite EA3463 moldable iron is a steel-filled two-component epoxy adhesive that is ideal for structural bonding and emergency repairs. This metal paste is offered in a convenient 50 g tube and is known for its versatility. It can be used for a variety of repairs, including sealing leaks in pipes and tanks, filling oversized screw holes, and smoothing weld seams. The application is simple and user-friendly, as the paste is moldable and easy to work with, even in emergency situations. Once cured, the adhesive provides high compressive strength, ensuring a durable and reliable repair. Additionally, it adheres well to various materials and is suitable for a wide temperature range of -30 °C to +121 °C, making it an effective solution for numerous applications.
- Versatile for various repairs
- User-friendly, moldable paste
- High compressive strength after curing
- Good adhesion to most materials
- Temperature resistant from -30 °C to +121 °C.

8. Loctite 5923 Liquid flat sealant 117ml
Loctite MR5923 Sealant Enhancer Liquid 117 ml
Special Features
Loctite MR5923 is a specialized sealing liquid for mechanical assembly, particularly in engines and transmissions. It is designed to seal flanges and enhance sealing for both old and new pre-cut gaskets.
Here are its main features and applications:
Sealing Liquid: Loctite MR5923 is a liquid applied to flanges to create a sealing layer between the connected surfaces.
Improved Sealing: The product enhances flange sealing, prevents leaks, and improves assembly performance.
Suitable for Old and New Gaskets: Loctite MR5923 can be used with both old and new pre-cut gaskets, making it a versatile solution for various situations and repairs.
Applications: Typical applications of Loctite MR5923 include sealing flanges in engines and transmissions, where a reliable seal is essential for optimal performance and reliability.
Strengths:
- For flanges with tight tolerances
- Quick drying
- Flexible setting
Hazard Information:
- H225: Liquid and vapor highly flammable.
- H317: May cause an allergic skin reaction.
- H319: Causes serious eye irritation.
- H336: May cause drowsiness or dizziness.
Safety Recommendations:
- P210: Keep away from heat, hot surfaces, sparks, open flames, and other ignition sources. No smoking.
- P261: Avoid breathing dust/fume/gas/mist/vapor/aerosol.
- P280: Wear protective gloves/protective clothing/eye protection/face protection.
- P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.
- P337 + P313: If eye irritation persists: Get medical advice/attention.
Technical Data:
Physical Form: Liquid
Color: Brown
Volume: 117 ml.

9. Loctite 2600859 515 Flüssigdichtung 50 ml
The Loctite 2600859 515 liquid gasket is a highly developed sealing material specifically designed for sealing machined metal flanges. With a medium-strength consistency, this product provides a reliable solution for industrial applications where a solid and permanent seal is required. The liquid gasket cures anaerobically, meaning it hardens in the absence of air, ensuring an effective seal between closely fitting metal surfaces. The application is simple and time-saving, with a fixture time of only about three minutes. Additionally, the sealant can fill gaps up to 0.25 mm, making it ideal for use in various machines and equipment. The Loctite 515 liquid gasket is therefore a valuable addition to any workshop or industrial environment where a reliable sealing solution is needed.
- Medium tensile shear strength of 6 N/mm² for reliable sealing
- Fixture time of about 3 minutes for quick assembly
- Anaerobic curing for effective seals between metal surfaces
- Fills gaps up to 0.25 mm and compensates for unevenness
- Ideal for applications in pumps, thermostats, and compressors.

10. Loctite Surface sealant LOCTITE 5970 50ml
Application: Connect
Color: Black
Strength: Low
Operating temperature min.: -60°C
Operating temperature max.: +200°C
Packaging unit: 50 ml
Product form: Paste
Trade name: Loctite 5970
Chemical components: Alkoxide silicone
Container type: Cartridge
Operating temperature range: -60 to +200 °C
Silicone adhesive and sealant, Loctite 5970. Dimensionally stable, non-corrosive, black one-component silicone adhesive and sealant for applications in the automotive industry, for sealing deep-drawn parts, end caps, and oil pans. Pasty before processing, vulcanizes at room temperature, low odor, and high resistance to engine operating fluids.
