Loctite 620 Vs. 680: Temperature Range Guide
Loctite 620 Overview
Features of Loctite 620
Loctite 620 is a high-strength retaining compound known for its exceptional performance in high-temperature environments. It is designed specifically to bond cylindrical fitting parts such as bushings, sleeves, pins, and bearings. The key features of Loctite 620 include:
- High-Temperature Resistance: Loctite 620 can withstand temperatures up to 450°F (232°C), making it suitable for applications where heat is a significant factor (Stickyn).
- Gap Filling: The adhesive can fill diametral clearances up to 0.015 inches (0.38 mm), which is effective for bonding components with slight imperfections or wear.
- Shock and Vibration Resistance: The compound prevents loosening and leakage due to shock and vibration, ensuring a reliable bond in demanding conditions (Henkel Adhesives).
- Versatility: Similar to other Loctite products like Loctite 638, it is versatile and suitable for a variety of industrial applications.
Applications of Loctite 620
Loctite 620 is used in various industries, particularly where high-temperature resistance is necessary. Its applications include:
- Automotive Industry: Used for bonding bearings in auto transmissions and sleeves in pump housings. Its high-temperature resistance makes it ideal for these demanding applications.
- Radiator Assemblies: Suitable for bonding locating pins in radiator assemblies, providing a secure fit and preventing loosening or leakage.
- General Industrial Use: Also used in other industrial equipment where maintaining bond strength at high temperatures is crucial.
For further details on similar adhesives, you can refer to our comparison of Loctite 638 vs. 680 and Loctite 609 vs. 680. To understand more about handling adhesives, visit proper application of Loctite 620. And if you have any questions on other adhesive comparisons like 527 glue vs e6000, check out our extensive guides.
Loctite 680 Overview
Loctite 680 is a green, high-strength, anaerobic-curing retaining compound designed for the assembly and attachment of cylindrical fitting parts. It’s widely used in industrial applications where strong, permanent bonding is required.
Characteristics of Loctite 680
Loctite 680 offers several unique properties that make it suitable for use in demanding industrial environments. Here are some of its salient characteristics:
- High Strength: Loctite 680 provides a shear strength of 4,000 psi, making it highly effective for securing metal fasteners permanently (Sticky Aide).
- Anaerobic Cure: It cures in the absence of air, which is beneficial when bonding cylindrical parts together.
- Oil-Tolerant: The adhesive performs well even on surfaces that are slightly contaminated with oils.
- Low Viscosity: This property allows it to wick into small gaps effectively, filling spaces up to 0.25 mm.
- High-Temperature Performance: Loctite 680 maintains its adhesive properties in moderately high temperatures.
Suitable Applications for Loctite 680
Loctite 680 is versatile and can be used in numerous applications. Here are some of the most common uses:
- Securing Bearings onto Shafts: This adhesive is effective for maintaining the alignment and longevity of bearings in an industrial setting.
- Fixing Bushings or Sleeves: Loctite 680 is ideal for securely bonding cylindrical parts, making it invaluable for assembly lines and machinery maintenance.
- Cylindrical Part Assemblies: It provides robust curing performance on all metal substrates, including passive ones like stainless steel and plated surfaces (Try Loctite).
| Characteristic | Details |
|---|---|
| Shear Strength | 4,000 psi |
| Gap Filling | Up to 0.25 mm |
| Curing Type | Anaerobic |
| Utility | Bearings, bushings, sleeves, cylindrical parts assemblies |
| Temperature Resistance | Moderate |
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Performance Comparison
Understanding the performance characteristics of Loctite 620 and Loctite 680 is essential for making an informed decision. This section compares their temperature resistance, strength and bonding properties, and chemical resistance.
Temperature Resistance
Loctite 620 is renowned for its high-temperature resistance, making it suitable for applications where heat is a significant factor. It can withstand temperatures up to 450°F (232°C).
Loctite 680 provides good temperature resistance, tolerating conditions up to 300°F (149°C). This makes it ideal for applications where moderate heat exposure occurs without compromising the adhesive’s integrity.
| Product | Maximum Temperature | Applications |
|---|---|---|
| Loctite 620 | 450°F (232°C) | High-temperature environments, such as bonding locating pins in radiator assemblies |
| Loctite 680 | 300°F (149°C) | Moderate heat exposure, such as bonding loose-fitting parts in heavy machinery |
Strength and Bonding Properties
Loctite 620 is designed for bonding cylindrical fitting parts to prevent loosening and leakage due to shock and vibration. Its high-strength properties make it suitable for demanding applications.
Loctite 680 is a high-strength retaining compound that is oil tolerant, primerless, and fluorescent for easy inspection. It excels in bonding loose-fitting parts such as worn shafts and housings in heavy machinery.
| Product | Strength | Bonding Properties |
|---|---|---|
| Loctite 620 | High | Prevents loosening and leakage in high-shock environments |
| Loctite 680 | High | Oil tolerant, primerless, fluorescent for inspection |
Chemical Resistance
Chemical resistance is an important factor to consider, as it determines the adhesive’s durability in harsh environments. Unfortunately, specific data on the chemical resistance of Loctite 620 and Loctite 680 isn’t available in the given context.
For detailed information on the chemical resistance of these products, consider consulting the manufacturer or relevant product datasheets. This would provide insight into the suitability of the adhesives for applications involving exposure to various chemicals.
Choosing between Loctite 620 and Loctite 680 depends on the specific requirements of your project. For more detailed comparisons and considerations, you might also be interested in articles like loctite 380 vs. 480 or loctite 609 vs. 680.
By understanding the performance characteristics of each product, you can make an informed decision tailored to your needs. For comprehensive application techniques and tips, explore our sections on the proper application of Loctite 620 and proper application of Loctite 680.
Selecting the Right Loctite
Choosing the right adhesive for your project involves considering various factors to ensure optimal performance. When deciding between Loctite 620 and 680, understanding their unique properties is essential.
Factors to Consider
When selecting between Loctite 620 and 680, several key factors should be taken into account:
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Temperature Resistance: Loctite 620 is ideal for high-temperature applications, withstanding temperatures up to 232°C (450°F). On the other hand, Loctite 680 offers excellent performance in moderate temperature ranges.
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Viscosity: Loctite 620 is a high-viscosity adhesive, making it suitable for gap-filling in applications like bonding bearings and bushings (Sticky Aide). Loctite 680, with its low-viscosity, is designed for close-fitting parts like gearboxes and valve housings.
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Strength and Bonding Properties: Both products offer high-strength bonds, but the specific bonding requirements of your project may dictate the choice. Loctite 620 provides high-strength bonding of cylindrical parts to prevent loosening and leakage due to shock and vibration (Henkel Adhesives).
| Factor | Loctite 620 | Loctite 680 |
|---|---|---|
| Temperature Resistance | Up to 232°C (450°F) | Moderate range |
| Viscosity | High | Low |
| Ideal Applications | Bearings, bushings | Gearboxes, valve housings |
| Strength and Bonding | High-strength, gap-filling | High-strength, close-fitting |
Project-Specific Considerations
To ensure successful bonding and longevity of your project, consider the following:
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Application Type: For high-temperature environments such as automotive exhaust systems, powertrain parts, and industrial gearboxes, Loctite 620 is recommended. Loctite 680 is more suitable for applications involving close-fitting parts like slip fits, press fits, and bonded heat shrink fits.
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Material Compatibility: Ensure that the adhesive is compatible with the materials you are bonding. Loctite 620 excels in applications with metal parts, while Loctite 680 performs well with cylindrical fitting parts requiring minimal gaps.
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Performance Requirements: Consider the mechanical stresses and environmental conditions the bond will face. For instance, Loctite 620’s high viscosity and gap-filling capabilities are suited for situations requiring shock and vibration resistance. Meanwhile, Loctite 680’s low viscosity is optimal for precision fitting in mechanical assemblies.
For more information on different adhesive requirements and applications, explore our detailed guides on construction adhesive vs. epoxy and ca glue vs. wood glue.
Application Techniques
Proper Application of Loctite 620
LOCTITE® 620 is specialized for applications requiring high temperature resistance up to 232°C (450°F). It is designed for bonding cylindrical fitting parts like locating pins in radiator assemblies, sleeves in pump housings, and bearings in auto transmissions to prevent loosening and leakage due to shock and vibration.
Application Steps:
- Surface Preparation: Clean and dry all surfaces to remove grease, oil, and dirt, ensuring proper adhesion.
- Apply Adhesive: Apply the Loctite 620 evenly to the surface, ensuring full coverage. A thin layer is usually sufficient.
- Assemble Parts: Press the parts together and hold them in place until the adhesive sets. This ensures that the bond is secure and durable.
- Curing: Allow the adhesive to cure at room temperature. The full cure time might take up to 24 hours depending on the temperature and substrate material.
Proper Application of Loctite 680
LOCTITE® 680 is a green, high-strength, anaerobic-curing retaining compound used for the assembly and attachment of cylindrical fitting parts, where low viscosity is required. It prevents loosening and leakage from shock and vibration, and it can cure on both active and passive surfaces without requiring a primer. Loctite 680 provides good temperature resistance, tolerating conditions up to 300°F (149°C).
Application Steps:
- Surface Preparation: Thoroughly clean the surfaces to be bonded, removing all contaminants to ensure a strong bond.
- Apply Adhesive: Dispense a few drops of Loctite 680 onto the inner and outer surfaces of the parts to be bonded.
- Assembly: Fit the parts together and apply pressure to ensure full contact. This helps in achieving a strong and reliable bond.
- Curing: Allow the adhesive to cure. Full curing might take up to 24 hours at room temperature. For faster curing, heat can be applied to accelerate the process.
By understanding and following the proper application techniques for Loctite 620 and Loctite 680, users can ensure optimal performance of these adhesives in their specific applications. For additional tips and information on adhesive comparisons, explore our articles on loctite 609 vs. 680 and loctite 638 vs. 680.
Practical Examples
Real-World Applications of Loctite 620
LOCTITE® 620 is designed for high-temperature applications, making it an excellent choice for specific industrial uses. Below are some practical examples where Loctite 620 excels:
- Radiator Assemblies: Loctite 620 is suitable for bonding locating pins in radiator assemblies due to its high-temperature resistance, up to 232°C (450°F).
- Pump Housings: It’s ideal for bonding sleeves in pump housings, ensuring they remain secure even under high temperatures.
- Auto Transmissions: Bearings in auto transmissions benefit from the high-temperature resistance and secure bonding provided by Loctite 620, preventing loosening and leakage due to shock and vibration.
Real-World Applications of Loctite 680
Loctite 680 is a high-strength, high-viscosity adhesive perfect for securing cylindrical parts. Here are some real-world applications:
- Cylindrical Parts Bonding: Loctite 680 is ideal for bonding cylindrical parts such as bearings and bushings. Its low viscosity facilitates bonding close-fitting parts like gearboxes and valve housings, ensuring a strong hold.
- Metal Fasteners: With a shear strength of 4,000 psi, Loctite 680 is suitable for securing metal fasteners permanently. This makes it an essential adhesive for projects requiring permanent mounting.
These practical examples highlight the versatility and specific use cases of Loctite 620 and Loctite 680. For more comparisons of glues and adhesives, explore articles like 527 glue vs e6000 and construction adhesive vs. epoxy.
