What is Loctite 638 used for?

It is designed for bonding and securing cylindrical fitting parts such as shafts, gears, pulleys, and bearings.

What gap size can this retaining compound bridge?

It is suitable for diametral clearances and gaps up to 0.25 mm between close-fitting metal parts.

How does Loctite 638 cure?

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

What is the operating temperature range?

The product withstands continuous service temperatures from -55 °C up to +180 °C.

How do you disassemble parts bonded with this product?

Due to its high strength, heat the assembly locally to 250 °C to break the bond and disassemble.

LOCTITE 638 fixing adhesive (250 ml bottle) - 1803042

Name: LOCTITE 638 fixing adhesive (250 ml bottle) - 1803042
Brand: LOCTITE
SKU: 11010086
Price: 215.2 EUR
Availability: InStock

Supplier number: LOCTITE 1803042 | EAN 5010266006437

Recommended Retail Price €271.97

215.20 tax incl.

€177.85 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 8 products in stock.

Ordered before 20:00 - delivered as of 03/10/2026
Free shipping
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.

High-strength bonding for cylindrical assemblies

Practical benefits

Robust Loctite 638 retention: You secure bearings, sleeves, and shafts firmly against severe shock, vibrations, and heavy dynamic loads.
Gap filling up to 0.25mm: You effectively bridge slip fits and tight tolerances on active metals as well as passive stainless steel.
Excellent heat and oil tolerance: You achieve dependable curing performance even with minor industrial oil contamination and elevated operating temperatures.

In a nutshell

The right choise for

With Loctite 638 retaining compound, you secure cylindrical components such as shafts, bearings, bushings, and gears with maximum bonding strength. This liquid formulation cures anaerobically between close-fitting metal surfaces, effectively bridging diametral gaps up to 0.25 mm. It prevents fretting corrosion, play, and loosening caused by severe shock or dynamic vibration. The compound tolerates minor industrial oil contamination and performs reliably across operating temperatures from -55 °C to +180 °C. Packed in a 250 ml bottle, it provides the robust retention you need for heavy-duty mechanical maintenance and assembly.

Product information FAQ

€215.20

In stock - tax incl.

Key features according to our expert

Net volume: 250 ml
Relative density: 1,1
ADR packing group: Not applicable
ADR class: Not applicable
Principal hazard property: GHS05 Corrosive
UN number: Not applicable
P-statements: P101; P102; P261; P273; P280; P302 + P352; P305 + P351 + P338; P333 + P313; P501
H-statements: H315; H317; H318; H335; H412
Hazard class: GHS05 Corrosive; GHS07 Harmful or irritant; GHS09 Environmental hazard
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Product description:

LOCTITE 638 - Retaining Compound - Henkel
LOCTITE 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 mm.
The product cures when confined in the absence of air between close-fitting metal surfaces and prevents looseningand leakage due to shock and vibration.
It not only works on active metals but also on passive substrates, exhibiting robust cure performance.
The product offers high-temperature performanceand good oil tolerance, and tolerates minor surface contaminants.

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.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P302 + P352: IF ON SKIN: Wash with plenty of water/…
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.
P501: Dispose of contents/container to ... (see safety data sheet).

Hazard statements

H315: Causes skin irritation.
H317: May cause an allergic skin reaction.
H318: Causes serious eye damage.
H335: May cause respiratory irritation.
H412: Harmful to aquatic life with long lasting effects.

All Features

Net volume: 250 ml
Relative density: 1,1
Adr packing group: Not applicable
Adr class: Not applicable
Principal hazard property: GHS05 Corrosive
Un number: Not applicable
P-statements: P101; P102; P261; P273; P280; P302 + P352; P305 + P351 + P338; P333 + P313; P501
H-statements: H315; H317; H318; H335; H412
Hazard class: GHS05 Corrosive; GHS07 Harmful or irritant; GHS09 Environmental hazard
Physical state: Liquid
Flash point: > 100 °C
Packaging: Bottle

Brand LOCTITE
11010086
EAN 5010266006437
Supplier number LOCTITE 1803042

Frequently asked questions about this product

Answered by specialists

What is Loctite 638 used for?: It is designed for bonding and securing cylindrical fitting parts such as shafts, gears, pulleys, and bearings.
What gap size can this retaining compound bridge?: It is suitable for diametral clearances and gaps up to 0.25 mm between close-fitting metal parts.
How does Loctite 638 cure?: It cures anaerobically in the absence of air between close-fitting metal surfaces.
What is the operating temperature range?: The product withstands continuous service temperatures from -55 °C up to +180 °C.
How do you disassemble parts bonded with this product?: Due to its high strength, heat the assembly locally to 250 °C to break the bond and disassemble.