Provides a bearing surface thus minimizing surface wear
Distributes fastener loads evenly to minimize surface deformation (when tightening fasteners)
Conducts electricity
May cover large clearance holes
Has more compression strength and can handle higher forces than non-metallic
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Aluminum 5712
Light weight — 1/3 the weight of steel
Good sealing capability
Non-magnetic
Good electrical conductor (30% copper)
Good heat conductor (70 btu/hr/sq ft/°F/ft)
May be anodized to increase corrosion resistance and is available in a wide variety of colors
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Beryllium Copper 5718
Good electrical conductor (17-22% copper)
May be heat treated for higher strength
Corrosion resistant
Non-magnetic
Good heat conductor (68 btu/hr/sq ft/°F/ft)
Good vase metal for plating
Excellent spring material
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Brass 5714
Good electrical conductor (26% copper)
Non-magnetic
Excellent plating base
Corrosion resistant — especially in a marine environment
Good heat conductor (70 btu/hr/sq ft/°F/ft)
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Copper 5716
Excellent electrical conductor (100% copper)
Excellent sealing capability
Corrosion resistant
Good plating base
Excellent thermal conductivity (225 btu/hr/sq ft/°F/ft)
Non-magnetic
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Phosphor Bronze 5720
Good bearing surface
Non-magnetic
Good electrical conductor (15% copper)
High strength
High temperature resistance
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Steel 5702
Least expensive metallic washer
Good plating base
Fair electrical conductor (12% copper)
Most commonly used material
Highest strength for cost
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Stainless Steel 5710
Excellent corrosion resistance
May be passivated for increased corrosion resistance
High strength
Low magnetic permeability — can vary with alloy and temper
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Titanium 5706
Extreme high temperature applications
Corrosion resistant
Quite expensive
High strength to weight ratio
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 |
| Covers large
clearance holes.
|
 |
| The terms washer, shim and spacer are essentially interchangeable and often dictated by personal preference. |
| |
| |
| Covers large clearance holes. |
| |
| The terms washer, shim and spacer are essentially interchangeable and often dictated by personal preference. |