What is Loctite 542 specifically used for?

It is designed for locking and sealing fine metal threads in hydraulic, pneumatic, and pipe fittings.

Can this thread sealant be used on plastic fittings?

No, Loctite 542 is formulated exclusively for metal threads up to a maximum thread size of 3/4 inch.

What is the operating temperature range?

The product withstands service temperatures from -55 °C to +150 °C.

Can fittings be disassembled later with hand tools?

Yes, its medium strength allows disassembly using standard hand tools.

Does it seal against pressure immediately?

Properly tightened fittings provide an instant seal against low pressures.

LOCTITE 542 thread sealant (250 ml bottle) - 234405

Name: LOCTITE 542 thread sealant (250 ml bottle) - 234405
Brand: LOCTITE
SKU: 11010069
Price: 122.4 EUR
Availability: InStock

Supplier number: LOCTITE 234405 | EAN 5010266542447

Recommended Retail Price €182.13

122.40 tax incl.

€101.16 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 3 products in stock.

Ordered before 20:00 - delivered as of 05/10/2026
Shipping costs €6.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

✆ 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 hydraulic sealing with Loctite 542

Practical benefits

Vibration and shock resistance: You prevent fine metal threaded fittings from loosening under operational shocks and continuous high-vibration conditions.
Robust fluid and oil resistance: You ensure durable sealing against fuels, oils, coolants, and hydraulic fluids across all metal connections.
Clean and precise application: Thanks to the thixotropic liquid formula, it stays in place without clogging delicate fluid filtration systems.

In a nutshell

The right choise for

With Loctite 542 hydraulic thread sealant in a practical 250 ml bottle, you reliably lock and seal fine metal threaded connections in hydraulic and pneumatic systems. Its thixotropic liquid formula stays exactly where applied without migrating, eliminating loose particles that could clog delicate valves or fluid filters. You effectively prevent fittings from loosening under severe vibration and mechanical shocks. Formulated to withstand service temperatures from -55 °C to +150 °C as well as fuels, oils, and hydraulic fluids, it delivers an instant low-pressure seal after assembly while remaining easy to disassemble with standard hand tools.

Product information FAQ

€122.40

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
Principal hazard property: GHS07 Harmful or irritant
UN number: Not applicable
P-statements: P101; P102; P261; P273; P337 + P313; P501
H-statements: H319; H335; H412
Hazard class: GHS07 Harmful or irritant
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Product description:

LOCTITE 542 - Thread Sealant - Henkel
LOCTITE 542 is designed for the locking and sealing of metal pipes and fittings as well as other cylindrical metal assemblies.
The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration.
The thixotropic nature of LOCTITE 542 reduces the migration of liquid product after application to the part.

Precautionary statements

P101: If medical advice is needed, have product container or label at hand.
P102: Keep out of reach of children.
P261: Avoid breathing dust/fume/gas/mist/vapours/spray.
P273: Avoid release to the environment.
P337 + P313: If eye irritation persists: Get medical advice/attention.
P501: Dispose of contents/container to ... (see safety data sheet).

Hazard statements

H319: Causes serious eye irritation.
H335: May cause respiratory irritation.
H412: Harmful to aquatic life with long lasting effects.

All Features

Net volume: 250 ml
Relative density: 1,08
Adr packing group: Not applicable
Adr class: Not applicable
Principal hazard property: GHS07 Harmful or irritant
Un number: Not applicable
P-statements: P101; P102; P261; P273; P337 + P313; P501
H-statements: H319; H335; H412
Hazard class: GHS07 Harmful or irritant
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Brand LOCTITE
11010069
EAN 5010266542447
Supplier number LOCTITE 234405

Frequently asked questions about this product

Answered by specialists

What is Loctite 542 specifically used for?: It is designed for locking and sealing fine metal threads in hydraulic, pneumatic, and pipe fittings.
Can this thread sealant be used on plastic fittings?: No, Loctite 542 is formulated exclusively for metal threads up to a maximum thread size of 3/4 inch.
What is the operating temperature range?: The product withstands service temperatures from -55 °C to +150 °C.
Can fittings be disassembled later with hand tools?: Yes, its medium strength allows disassembly using standard hand tools.
Does it seal against pressure immediately?: Properly tightened fittings provide an instant seal against low pressures.