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How to Specify Custom Parts
Engineering Reference Handbook

Bus Bars Washers - C Shaped
Clamps and Brackets Washers - Centering
Expansion Plugs Washers - Countersunk
Grounding Straps Washers - Finishing
Insulators Washers - Flat
Jumpers Washers - Lock
Retaining Rings Washers - Odd Shaped ID
Sheet Metal Nuts and Strips Washers - Odd Shaped OD
Solder Lugs Washers - Retaining
Spacers Washers - Retention
Spring Clips Washers - Shoulder
Tags Washers - Split
Washers - Spring
Washers - Tab, Key, and Notch
Washers - Terminal Cup


Round Flat Washers

Definition: All round, flat washers are flat discs with a centrally located holes, however the choice of a metallic or non-metallic flat washer is dictated by the washer’s application in an assembly.

Metallic Flat Washers

Applications: Metallic flat washers are used in applications requiring a bearing surface for fasteners to minimize surface wear, as well as, evenly distributing fastener loads to minimize surface deformation when the fastener is tightened. They are, also, used to cover large clearance holes. Metallic flat washers can conduct electricity and provide more compression strength than non-metallic flat washers.

Flat Round Washers are available in the following materials and finishes:

  • Aluminum: Anodize, Cadmium types I & II, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, Zinc types I & II
  • Beryllium Copper: Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Brass: Black Oxide, Cadmium types I & II, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Copper: Black Oxide, Cadmium types I & II, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Cold Rolled Steel (Steel): Black Oxide, Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Pickling, Phosphate, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Phosphorous Bronze: Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Stainless Steel: Black Oxide, Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Passivate, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Stainless Steel 316: Black Oxide, Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Passivate, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II
  • Titanium: Cadmium types I & II, Chrome, Degreasing, Bright Nickel, Pickling, Silver, Bright Tin, Hot Tin Dip, and Zinc types I & II

Aluminum Flat Washer: 5712
Beryllium Copper Flat Washer: 5718
Brass Flat Washer: 5714
Copper Flat Washer: 5716
Phosphor Bronze Flat Washer: 5720
Stainless Steel Flat Washer: 5710
Stainless Steel 316 Flat Washer: 5711
Steel (Cold Rolled Steel) Flat Washer: 5700, 5702
Titanium Flat Washer: 5706

Example: Flat Round Washer



Non-Metallic Flat Washers

Applications: Non-metallic flat washers are used in applications requiring electrical and thermal insulation or isolation in an assembly. They also provide a sealing function by conforming to the surface configuration. Due to the elastic or plastic properties of some non-metallic flat washers the can provide cushioning between parts in an assembly, as well as protecting surface finishes.

Flat Round Washers are available in the following materials and finishes:

  • Acetal: No Finishes
  • Fiberglass: No Finishes
  • Fibre (fiber): No Finishes
  • Kapton: No Finishes
  • Mica: No Finishes
  • Mylar: No Finishes
  • Neoprene: No Finishes
  • Nylatron: No Finishes
  • Nylon: Dyed
  • Phenolic: No Finishes
  • Polyethylene: No Finishes
  • PVC: No Finishes
  • PTFE: Dyed

Acetal Flat Washer: 5614
Fiberglass Flat Washer: 5621
Fibre Flat Washer: 5600, 5602
Kapton Flat Washer: 5611
Mica Flat Washer: 5624
Mylar Flat Washer: 5622
Neoprene Flat Washer: 5613
Nylatron Flat Washer: 5615
Nylon Flat Washer: 5606, 5610
Phenolic Flat Washer: 5620
Polyethylene Flat Washer: 5617
PVC Flat Washer: 5619
PTFE Flat Washer: 5612

Example: Flat Round Washer