Loctite Green 638 High Strength, Retaining Compound 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide,
- RS Stock No.:
- 821-1425
- Mfr. Part No.:
- Loctite 638
- Brand:
- Loctite
Bulk discount available
Subtotal (1 unit)*
£13.33
(exc. VAT)
£16.00
(inc. VAT)
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In Stock
- 337 unit(s) ready to ship
- Plus 66 unit(s) ready to ship from another location
- Plus 444 unit(s) shipping from 24 October 2025
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Units | Per unit |
|---|---|
| 1 - 5 | £13.33 |
| 6 - 14 | £12.79 |
| 15 + | £12.53 |
*price indicative
- RS Stock No.:
- 821-1425
- Mfr. Part No.:
- Loctite 638
- Brand:
- Loctite
Specifications
Technical Reference
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
|---|---|---|
| Brand | Loctite | |
| Trade Name | 638 | |
| Application | Bonding | |
| Anaerobic | Yes | |
| Colour | Green | |
| Chemical Ingredients | 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin | |
| Product Form | Liquid | |
| Package Type | Bottle | |
| Package Size | 10 ml | |
| Cure Time | Up to 72h depending on the substrate used, the bondline gap, and the temperature. | |
| Strength | High | |
| Maximum Operating Temperature | +150°C | |
| Minimum Operating Temperature | -55°C | |
| Chemical Composition | 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin | |
| Operating Temperature Range | -55 → +150 °C | |
Select all | ||
|---|---|---|
Brand Loctite | ||
Trade Name 638 | ||
Application Bonding | ||
Anaerobic Yes | ||
Colour Green | ||
Chemical Ingredients 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin | ||
Product Form Liquid | ||
Package Type Bottle | ||
Package Size 10 ml | ||
Cure Time Up to 72h depending on the substrate used, the bondline gap, and the temperature. | ||
Strength High | ||
Maximum Operating Temperature +150°C | ||
Minimum Operating Temperature -55°C | ||
Chemical Composition 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin | ||
Operating Temperature Range -55 → +150 °C | ||
- COO (Country of Origin):
- IE
Loctite 638 High Strength Retaining Compound
Loctite 638 is a high strength retaining compound designed for the bonding of cylindrical parts where the bond gaps can approach 0.25 mm. The compound is used to fill the inner space between components and close-fitting metal surfaces. Loctite 638 cures in the absence of air to form a strong precision assembly and prevents loosening and leakage caused by shock and vibration.
What is a Retaining Compound?
A retaining compound is an anaerobic adhesive that can secure bearings, bushes and cylindrical parts into housings or onto shafts. The compound is applied as a liquid and is used to fill in the inner spaces of components forming a 100% contact between mating metal surfaces. Once cured the retaining compound forms a strong precision assembly
What Are The Benefits of a Retaining Compound?
A retaining compound helps to achieve maximum load transmission capability and uniform stress distribution. Micro movements between parts are eliminated to prevent component damage and fretting corrosion which reduces the need to purchase costly replacement parts
Features and Benefits of Loctite 638
• Robust curing performance
• Works on active metals such as mild steel
• Works on passive substrates such as stainless steel and plated surfaces
• High temperature performance
• Tolerates minor surface contaminations from oils including cutting, lubrication, anti-corrosion and protection fluids
• Works on active metals such as mild steel
• Works on passive substrates such as stainless steel and plated surfaces
• High temperature performance
• Tolerates minor surface contaminations from oils including cutting, lubrication, anti-corrosion and protection fluids
• Single component, quick and easy to apply
• Ideal for shafts, gears, pulleys and similar cylindrical parts
• DVGW Approval (EN 751-1): NG-5146AR0619
• WRAS Approval (BS 6920): 0511518
Applications
Loctite 638 retaining compound offers a high resistance to dynamic, axial and radial loads. This feature makes Loctite 638 ideal for bonding cylindrical fitting parts, shafts, gears, pulleys and locking bushing and sleeves into housings and onto shafts.
Note
Testing should be carried out prior to contact with styrene, acrylic and polycarbonate based plastics to ensure compatibility.
Threadlocking and Retainers