Product Overview
Loctite 603 is a high-strength, anaerobic retaining compound specially formulated for the bonding of cylindrical fitting parts. It provides excellent performance on both active and passive metals and is highly effective even on slightly contaminated surfaces. It also offers high temperature resistance, superior gap filling, and outstanding resistance to vibration, ensuring long-term reliability in mechanical assemblies.
Key Features & Benefits
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High Strength: Provides maximum holding power for tight-fitting cylindrical assemblies.
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Oil Tolerant: Performs well on slightly oily or contaminated surfaces.
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Temperature Resistant: Withstands continuous exposure up to 150°C.
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Excellent Gap Filling: Fills clearance gaps up to 0.1 mm.
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Prevents Loosening: Protects against shock, vibration, and leakage.
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Reliable on Passive Metals: Works effectively on stainless steel and plated surfaces.
Typical Applications
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Retaining bearings in housings and shafts
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Securing bushings, sleeves, and cylindrical parts
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Preventing movement or loosening in rotating assemblies
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Ideal for electric motor housings, gears, and pulleys
Technical Specifications
| Property | Specification |
|---|---|
| Color | Green |
| Viscosity | Medium |
| Cure Type | Anaerobic |
| Strength | High |
| Service Temperature Range | -55°C to +150°C |
| Recommended Gap | Up to 0.1 mm |
| Cure Time (Full Strength) | 24 hours |
| Handling Strength | 10 – 20 minutes |
How to Use
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Surface Preparation: Clean and dry all mating surfaces. Light oil contamination is acceptable.
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Application: Apply Loctite 603 evenly to both parts before assembly.
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Assembly: Fit parts together and remove excess adhesive.
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Curing: Allow anaerobic curing at room temperature. Full strength develops in 24 hours.
FAQs
Q1: Can Loctite 603 be used on oily surfaces?
Yes. It is designed to cure reliably on slightly oily or contaminated parts without a primer.
Q2: What’s the difference between Loctite 603 and Loctite 638?
Loctite 603 is optimized for smaller gaps and higher precision fits, while 638 offers higher temperature resistance and gap filling capability.
Q3: Is heat required for curing?
No. Loctite 603 cures anaerobically at room temperature once confined between metal surfaces.
Q4: Can it be disassembled?
Disassembly requires localized heat (around 250°C) and mechanical tools.
