What is Loctite 518 used for?

You use it as a form-in-place gasket sealant for rigid metal flanges, such as gearbox and engine casings.

How does this gasket sealant cure?

It cures anaerobically in the absence of air between close-fitting metal mating surfaces.

What is the maximum gap fill of Loctite 518?

It reliably fills gaps and surface irregularities up to 0.25 mm.

What is the operating temperature range?

Once cured, the seal withstands temperatures ranging from -55 °C to +150 °C.

Is Loctite 518 suitable for aluminium flanges?

Yes, it bonds effectively to active metals like steel as well as passive substrates like aluminium.

LOCTITE 518 surface sealant (300 ml standard tube) - 2069177

Name: LOCTITE 518 surface sealant (300 ml standard tube) - 2069177
Brand: LOCTITE
SKU: 11010252
Price: 165.4 EUR
Availability: InStock

Supplier number: LOCTITE 2069177 | EAN 5010266012131

Recommended Retail Price €221.21

165.40 tax incl.

€136.69 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered tomorrow 07/11/2026
Free shipping
Delivery by DHL

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Reliable sealing for rigid metal flanges

Practical benefits

Instant low pressure seal: You assemble rigid joints faster because the sealant resists low pressures immediately after fitting.
Semi-flexible gap filling performance: You bridge gaps up to 0.25 mm with a formulation that accommodates minor component movements.
Easy disassembly during maintenance: Thanks to medium strength curing, you cleanly disassemble parts later using standard hand tools.

In a nutshell

The right choise for

With Loctite 518 flange sealant, you create a reliable and leak-free joint between rigid metal flanges on engine and gearbox housings. This semi-flexible anaerobic formula easily fills gaps and surface imperfections up to 0.25 mm, providing instant resistance to low pressures immediately after assembly. It adheres effectively to both active metals like steel and passive materials such as aluminium, withstanding operating temperatures from -55 °C to +150 °C. By eliminating the need for pre-cut gaskets, it ensures a dependable seal for all mechanical assemblies. Thanks to its medium strength curing, parts can be disassembled cleanly during future maintenance using standard hand tools. The 300 ml cartridge is ideal for workshop use.

Product information FAQ

€165.40

In stock - tax incl.

Key features according to our expert

Net volume: 300 ml
Relative density: 1,1
ADR class: Not applicable
UN number: Not applicable
Principal hazard property: GHS07 Harmful or irritant
ADR packing group: Not applicable
P-statements: P273; P280; P302 + P352; P333 + P313; P337 + P313
H-statements: H315; H317; H319; H412
Hazard class: GHS07 Harmful or irritant
Physical state: Liquid
Flash point: > 100 °C
Packaging: Cartridge

Product description:

Medium-strength, general purpose gasketing product - excellent contamination tolerance.
Ideal for use on casted iron, steel and aluminum flanges.
LOCTITE 518 cures when confined in the absence of air between close-fitting metal surfaces.
It is an anaerobic gasketing material designed for use on rigid iron, aluminum, and steel flanged mating surfaces.
Fills gaps up to 0.25mm and forms a flexible, chemical-resistant seal that will not tear or decay.
Parts disassemble easily, even after extended service.
Typical applications include sealing close-fitting joints between rigid metal faces and flanges.
It is also used as a formed-in-place gasket on rigid flanged connections, e.g. transmissions and engine housings.
NEW: Henkel has recently improved the product formulation of LOCTITE 518 providing: Higher strength on contaminated surfaces Better flexibility and improved adhesion Enhanced sealing capability Improved gap cure High performance on passive metals without an activator

Precautionary statements

P273: Avoid release to the environment.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P302 + P352: IF ON SKIN: Wash with plenty of water/…
P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.
P337 + P313: If eye irritation persists: Get medical advice/attention.

Hazard statements

H315: Causes skin irritation.
H317: May cause an allergic skin reaction.
H319: Causes serious eye irritation.
H412: Harmful to aquatic life with long lasting effects.

All Features

Net volume: 300 ml
Relative density: 1,1
Adr class: Not applicable
Un number: Not applicable
Principal hazard property: GHS07 Harmful or irritant
Adr packing group: Not applicable
P-statements: P273; P280; P302 + P352; P333 + P313; P337 + P313
H-statements: H315; H317; H319; H412
Hazard class: GHS07 Harmful or irritant
Physical state: Liquid
Flash point: > 100 °C
Packaging: Cartridge

Brand LOCTITE
11010252
EAN 5010266012131
Supplier number LOCTITE 2069177

Frequently asked questions about this product

Answered by specialists

What is Loctite 518 used for?: You use it as a form-in-place gasket sealant for rigid metal flanges, such as gearbox and engine casings.
How does this gasket sealant cure?: It cures anaerobically in the absence of air between close-fitting metal mating surfaces.
What is the maximum gap fill of Loctite 518?: It reliably fills gaps and surface irregularities up to 0.25 mm.
What is the operating temperature range?: Once cured, the seal withstands temperatures ranging from -55 °C to +150 °C.
Is Loctite 518 suitable for aluminium flanges?: Yes, it bonds effectively to active metals like steel as well as passive substrates like aluminium.