What is Loctite 549 used for?

You use it as a form-in-place gasket sealant for rigid metal flanges on pumps, thermostats, compressors, and gearboxes.

How does this gasket sealant cure?

It cures anaerobically at room temperature when confined in the absence of air between close-fitting metal surfaces.

What is the operating temperature range?

The sealant is suitable for service temperatures ranging from -55 °C to +150 °C.

Does it provide immediate sealing after assembly?

Yes, it provides an instant seal against low pressures immediately after flange assembly.

Which materials is Loctite 549 compatible with?

It is designed for rigid metal surfaces and flanges, such as steel and aluminium.

LOCTITE 549 surface sealant orange (250 ml bottle) - 230238

Name: LOCTITE 549 surface sealant orange (250 ml bottle) - 230238
Brand: LOCTITE
SKU: 11010071
Price: 124.95 EUR
Availability: InStock

Supplier number: LOCTITE 230238 | EAN 5010266234915

Recommended Retail Price €157.95

124.95 tax incl.

€103.26 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered tomorrow 02/10/2026
Shipping costs €6.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

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How does it work?

For a purchase value of €99 to €125 excl. VAT, receive FREE LOCTITE 55 thread sealing cord 50 m (IDH 528244) worth €9.99.
For a purchase value of more than €125 excl. VAT, receive FREE LOCTITE SF 7850 hand cleaner 400 ml (IDH 2098250) worth €13.21.
The free item is automatically added to your order. No registration is required.
The promotion is valid from 01.10.2026 to 31.10.2026.
Loctite Buy & Get deals are recognisable by the promotion label on the product page. Click the label to view all available deals.

Reliable flange sealing with Loctite 549

Practical benefits

Instant low pressure seal: You prevent fluid leaks immediately after assembly thanks to the fast-acting low-pressure sealing capability.
Broad temperature resistance: You maintain durable joint integrity across demanding operating temperatures ranging from -55 °C to 150 °C.
Effective gap filling performance: The thixotropic gel formula allows you to fill surface imperfections and machining marks between rigid metal faces smoothly.

In a nutshell

The right choise for

With the orange Loctite 549 flange sealant, you create a dependable and durable seal on rigid metal joints and mating faces. This anaerobic liquid sealant replaces pre-cut compression gaskets and cures at room temperature when confined without air between close-fitting metal surfaces. Thanks to its thixotropic consistency, it smoothly fills minor gaps and machining imperfections without running off. You benefit from an instant low-pressure seal immediately after assembly, effectively preventing fluid, oil, and gas leaks. Featuring a wide service temperature range from -55 °C to 150 °C, this 250 ml pack delivers dependable joint integrity for maintaining and assembling pumps, compressors, thermostat housings, and gearboxes.

Product information FAQ

€124.95

In stock - tax incl.

Key features according to our expert

Net volume: 250 ml
Relative density: 1,25
ADR packing group: Not applicable
UN number: Not applicable
ADR class: Not applicable
Physical state: Liquid
Flash point: > 100 °C
Packaging: Tube

Product description:

LOCTITE 549 - methacrylate slow curing thread sealant - Henkel
LOCTITE 549 is an orange, high strength, slow curing methacrylate thread sealant.
It cures in the absence of air and by contact with metals when confined within threads up to M80/R3".
This thixotropic product is suitable for all metal fittings and its breakaway torque rating is 20Nm.
Viscosity is 20,000 mPa-s and service temperature, -55 C to +150 C.

All Features

Net volume: 250 ml
Relative density: 1,25
Adr packing group: Not applicable
Un number: Not applicable
Adr class: Not applicable
Physical state: Liquid
Flash point: > 100 °C
Packaging: Tube

Brand LOCTITE
11010071
EAN 5010266234915
Supplier number LOCTITE 230238

Frequently asked questions about this product

Answered by specialists

What is Loctite 549 used for?: You use it as a form-in-place gasket sealant for rigid metal flanges on pumps, thermostats, compressors, and gearboxes.
How does this gasket sealant cure?: It cures anaerobically at room temperature when confined in the absence of air between close-fitting metal surfaces.
What is the operating temperature range?: The sealant is suitable for service temperatures ranging from -55 °C to +150 °C.
Does it provide immediate sealing after assembly?: Yes, it provides an instant seal against low pressures immediately after flange assembly.
Which materials is Loctite 549 compatible with?: It is designed for rigid metal surfaces and flanges, such as steel and aluminium.