What is Loctite 573 used for?

You use it to seal close-fitting joints between rigid metal faces and flanges, such as gearboxes and engine casings.

How does this flange sealant cure?

It cures anaerobically, which means it hardens in the absence of air when confined between close-fitting metal surfaces.

What is the maximum gap size for Loctite 573?

This sealant is designed for close-fitting flange parts with gaps up to 0.25 mm.

Why choose Loctite 573 for complex assemblies?

Its slow cure rate allows you ample time to align and assemble large or intricate flanges without premature curing.

Which fluids is this sealant resistant to?

It offers high resistance to common industrial fluids, engine oils, transmission fluids, and water.

LOCTITE 573 surface sealant (250 ml bottle) - 142614

Name: LOCTITE 573 surface sealant (250 ml bottle) - 142614
Brand: LOCTITE
SKU: 11010075
Price: 139.6 EUR
Availability: InStock

Supplier number: LOCTITE 142614 | EAN 5010266573410

Recommended Retail Price €176.48

139.60 tax incl.

€115.37 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 2 products in stock.

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 flange sealing for rigid metal assemblies

Practical benefits

Extra time for alignment: The slow curing nature of Loctite 573 gives you ample time to assemble and align complex multi-hour casing jobs.
Minimal liquid migration: Thanks to its thixotropic consistency, the sealant stays firmly on the metal joint without running off after application.
Robust form-in-place seal: You achieve dependable gasketing across close-fitting rigid flanges that reliably withstands demanding mechanical conditions.

In a nutshell

The right choise for

With the Loctite 573 flange sealant, you create a dependable and durable seal between close-fitting rigid metal flanges. Thanks to its slow curing rate, you have ample time to accurately align and assemble large parts such as gearboxes and engine casings. Its thixotropic consistency prevents run-off after application, ensuring the sealant stays exactly where applied. The product cures anaerobically between mating metal surfaces for gap sizes up to 0.25 mm. In addition, the seal provides high resistance to engine oils, transmission fluids, and common industrial fluids.

Product information FAQ

€139.60

In stock - tax incl.

Key features according to our expert

Net volume: 250 ml
Relative density: 1,08
ADR packing group: Not applicable
ADR class: Not applicable
UN number: Not applicable
Physical state: Liquid
Flash point: > 100 °C
Packaging: Tube

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

Brand LOCTITE
11010075
EAN 5010266573410
Supplier number LOCTITE 142614

Frequently asked questions about this product

Answered by specialists

What is Loctite 573 used for?: You use it to seal close-fitting joints between rigid metal faces and flanges, such as gearboxes and engine casings.
How does this flange sealant cure?: It cures anaerobically, which means it hardens in the absence of air when confined between close-fitting metal surfaces.
What is the maximum gap size for Loctite 573?: This sealant is designed for close-fitting flange parts with gaps up to 0.25 mm.
Why choose Loctite 573 for complex assemblies?: Its slow cure rate allows you ample time to align and assemble large or intricate flanges without premature curing.
Which fluids is this sealant resistant to?: It offers high resistance to common industrial fluids, engine oils, transmission fluids, and water.