FIBRE MATERIALS CORP.
40 Dupont Street
Plainview, NY 11803
Tel: (516)349-1660
Fax: (516)349-1671
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Flat non-metallic washers come in a multitude of materials and sizes. Therefore, a review of certain definitions should be presented to make it easier for the buyer to order or an engineer to design a washer.
Concentricity and Position:
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If you were to take the small circle and overlay it onto a large circle whereby each center was exactly on top of each other...you would have concentricity. The I.D. and O.D. circles created would be equidistant from one another as you moved around the washer. Nema tolerances permit a variance of .010 from center of washer. Both concentricity and position are considered location symbols dealing with tolerances.
Wall Thickness:
A general rule of thumb when deciding if the wall of a washer can be created during the manufacturing process is...Subtract the I.D. from the O.D., then divide by two(2). If your answer is less than the thickness of the material you are using, there is a good chance the material will disintegrate in the die. Consult our office if you have any questions:
Material Thickness and Tolerances:
All materials that are manufactured have tolerances regarding thickness. All tolerances are not the same between materials. Check with our office before you enter the tolerances on the blueprint.
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