What is Loctite 573 used for?

It is used as a form-in-place gasket to seal close-fitting joints between rigid metal faces and flanges.

How does this flange sealant cure?

It is an anaerobic sealant that cures when confined in the absence of air between close-fitting metal surfaces.

What maximum gap can this sealant bridge?

It is designed for close-fitting flange connections with gaps up to 0.25 mm.

Why choose Loctite 573 for extended assemblies?

Its slow curing speed allows ample time to position and bolt large or complex parts without premature curing.

What is the volume of this bottle?

This bottle contains 50 ml of liquid sealant.

LOCTITE 573 surface sealant (50 ml bottle) - 234503

Name: LOCTITE 573 surface sealant (50 ml bottle) - 234503
Brand: LOCTITE
SKU: 11010074
Price: 33.8 EUR
Availability: InStock

Supplier number: LOCTITE 234503 | EAN 5010266573335

33.80 tax incl.

€27.93 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered as of 05/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

↓ Documents (1) ✆ Talk to a specialist

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 surface sealing for metal flanges

Practical benefits

Ideal for lengthy assembly: Slow curing properties give you ample time to align and position large or complex machined metal casings.
Loctite 573 prevents leaks: The anaerobic formula cures between tight-fitting metal faces to create a durable, fluid-resistant form-in-place gasket.
Minimal migration after application: Its thixotropic nature ensures the liquid stays in place without dripping or running before you assemble parts.

In a nutshell

The right choise for

With Loctite 573 flange sealant, you create a dependable seal between rigid metal faces and flanges without relying on traditional pre-cut gaskets. This anaerobic formula cures in the absence of air between close-fitting metal surfaces, bridging gaps of up to 0.25 mm. Its slow cure speed gives you the time needed to align and assemble large or complex parts, such as gearboxes and crankcases, with complete precision. The thixotropic liquid stays where you place it without running or dripping. Supplied in a 50 ml bottle, it forms a durable form-in-place gasket that resists fluids, withstands vibrations, and protects against crevice corrosion.

Product information FAQ

€33.80

In stock - tax incl.

Key features according to our expert

Net volume: 50 ml
Relative density: 1,08
ADR packing group: Not applicable
UN number: Not applicable
ADR class: Not applicable
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Product description:

Gasketing Product - slow curing.
Ideal for use on machined and rigid metal flanges.
LOCTITE 573 seals close-fitting joints between rigid metal faces and flanges.
The product cures when confined in the absence of air between close-fitting metal surfaces.
Typically used as a form-in-place gasket on rigid flanged connections, e.g. transmission and engine casings, etc.
It is the ideal product for part assembly jobs extending over several hours.
The nature of LOCTITE 573 reduces the migration of liquid product after application to the part.

Documents

⤓ Safety sheet PDF

All Features

Net volume: 50 ml
Relative density: 1,08
Adr packing group: Not applicable
Un number: Not applicable
Adr class: Not applicable
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Brand LOCTITE
11010074
EAN 5010266573335
Supplier number LOCTITE 234503

Frequently asked questions about this product

Answered by specialists

What is Loctite 573 used for?: It is used as a form-in-place gasket to seal close-fitting joints between rigid metal faces and flanges.
How does this flange sealant cure?: It is an anaerobic sealant that cures when confined in the absence of air between close-fitting metal surfaces.
What maximum gap can this sealant bridge?: It is designed for close-fitting flange connections with gaps up to 0.25 mm.
Why choose Loctite 573 for extended assemblies?: Its slow curing speed allows ample time to position and bolt large or complex parts without premature curing.
What is the volume of this bottle?: This bottle contains 50 ml of liquid sealant.