Engineering Resources

Engineering Data
Engineering Reference Handbook
How to Specify Custom Parts
Engineering Reference Handbook

Clamps & Brackets
Expansion Plugs
Metallic Flat Washers
Miscellaneous Electrical Hardware
Miscellaneous Washers
Non-Metallic Washers
Retaining Rings
Sheet Metal Nuts
Shoulder Washers
Solder Lugs
Solid State Insulators
Spring Clips
Spring Washers
Tab, Key & Notch Washers

Metallic Flat Washers

• A flat disc with a centrally located hole.
• 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.

The terms washer, shim and spacer are essentially interchangeable and often dictated by personal preference.

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

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 base metal for plating
• Excellent spring material

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)

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

Phosphor Bronze 5720

• Good bearing surface
• Non-magnetic
• Good electrical conductor (15% copper)
• High strength
• High temperature resistance

Steel 5702

• Least expensive metallic washer
• Good plating base
• Fair electrical conductor (12% copper)
• Most commonly used material
• Highest strength for cost

Stainless Steel 5710

• Excellent corrosion resistance
• May be passivated for increased corrosion resistance
• High strength
• Low magnetic permeability — can vary with alloy and temper

Titanium 5706

• Extreme high temperature applications
• Corrosion resistant
• Quite expensive
• High strength to weight ratio