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| Quantity: | |
|---|---|
Flat Washer | |||
1/4-20 | 5/16-18 | 3/8-16 | 1/2-13 |
9/16-12 | 5/8-11 | 3/4-10 | M3-0.5 |
M4-0.7 | M5-0.8 | M6-1.0 | M8-1.25 |
M10-1.5 | M12-1.75 | M16-2.0 | M20-2.5 |
The Copper Alloy Cup Washers for Machinery Fixing are specialized vibration-damping components designed to provide secure, long-lasting fastening in dynamic machinery applications. Constructed from high-purity copper-zinc-silicon alloy through precision deep-drawing processes, these cup-shaped washers create a controlled spring-like action that maintains consistent clamp load under cyclic stress, effectively preventing fastener loosening in vibrating equipment .
Parameter | Value |
Material | Copper-Zinc-Silicon Alloy (Cu 85%, Zn 10%, Si 5% for spring properties) |
Size Range | M5 - M24 (compatible with standard metric fasteners) |
Cup Depth | 1.5mm - 4mm (proportionate to size for optimal spring action) |
Hardness | HV100 - 130 (with 5-8% elongation for spring recovery) |
Tensile Strength | 450 - 550 MPa (minimum ultimate tensile strength) |
Surface Finish | Natural copper (with tarnish-resistant treatment) |
Spring Rate | 15-35 N/mm (varies by size and cup depth) |
• Cup-shaped design creates axial spring force (10-50N depending on size) to actively resist vibration-induced loosening, unlike passive flat washers
• Excellent conformability to uneven surfaces, ensuring 100% contact area and preventing leaks in fluid-tight assemblies
• Corrosion resistance in atmospheric and water-based environments, with natural oxide layer that self-heals minor scratches
• Good thermal conductivity (45 W/m·K) facilitates heat transfer away from bolted joints, preventing thermal fatigue
• Broad material compatibility with steel, stainless steel, and brass fasteners, eliminating galvanic corrosion concerns
Widely used in centrifugal pumps, electric motor mounts, generator assemblies, and heavy machinery drive trains. Ideal for securing engine mounts in automotive applications, conveyor system rollers, and industrial compressor fittings subject to continuous vibration and thermal cycling .
Q: How does this differ from standard flat washers?
A: The cup design provides active tension maintenance through spring action, maintaining 90%+ of initial clamp load after 10,000 vibration cycles—compared to 50-60% retention with flat washers.
Q: Can they be reused after disassembly?
A: Yes, maintains spring properties through 5+ assembly/disassembly cycles; visual inspection for deformation is recommended before reuse.
Q: What's the maximum load capacity?
A: Safe working load up to 80% of tensile strength (360-440 MPa) for extended service life, with yield point at 270-330 MPa.
Flat Washer | |||
1/4-20 | 5/16-18 | 3/8-16 | 1/2-13 |
9/16-12 | 5/8-11 | 3/4-10 | M3-0.5 |
M4-0.7 | M5-0.8 | M6-1.0 | M8-1.25 |
M10-1.5 | M12-1.75 | M16-2.0 | M20-2.5 |
The Copper Alloy Cup Washers for Machinery Fixing are specialized vibration-damping components designed to provide secure, long-lasting fastening in dynamic machinery applications. Constructed from high-purity copper-zinc-silicon alloy through precision deep-drawing processes, these cup-shaped washers create a controlled spring-like action that maintains consistent clamp load under cyclic stress, effectively preventing fastener loosening in vibrating equipment .
Parameter | Value |
Material | Copper-Zinc-Silicon Alloy (Cu 85%, Zn 10%, Si 5% for spring properties) |
Size Range | M5 - M24 (compatible with standard metric fasteners) |
Cup Depth | 1.5mm - 4mm (proportionate to size for optimal spring action) |
Hardness | HV100 - 130 (with 5-8% elongation for spring recovery) |
Tensile Strength | 450 - 550 MPa (minimum ultimate tensile strength) |
Surface Finish | Natural copper (with tarnish-resistant treatment) |
Spring Rate | 15-35 N/mm (varies by size and cup depth) |
• Cup-shaped design creates axial spring force (10-50N depending on size) to actively resist vibration-induced loosening, unlike passive flat washers
• Excellent conformability to uneven surfaces, ensuring 100% contact area and preventing leaks in fluid-tight assemblies
• Corrosion resistance in atmospheric and water-based environments, with natural oxide layer that self-heals minor scratches
• Good thermal conductivity (45 W/m·K) facilitates heat transfer away from bolted joints, preventing thermal fatigue
• Broad material compatibility with steel, stainless steel, and brass fasteners, eliminating galvanic corrosion concerns
Widely used in centrifugal pumps, electric motor mounts, generator assemblies, and heavy machinery drive trains. Ideal for securing engine mounts in automotive applications, conveyor system rollers, and industrial compressor fittings subject to continuous vibration and thermal cycling .
Q: How does this differ from standard flat washers?
A: The cup design provides active tension maintenance through spring action, maintaining 90%+ of initial clamp load after 10,000 vibration cycles—compared to 50-60% retention with flat washers.
Q: Can they be reused after disassembly?
A: Yes, maintains spring properties through 5+ assembly/disassembly cycles; visual inspection for deformation is recommended before reuse.
Q: What's the maximum load capacity?
A: Safe working load up to 80% of tensile strength (360-440 MPa) for extended service life, with yield point at 270-330 MPa.
