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FIIG:  A022B0

Entry Date:  Apr-01-1974

Concept:  1

Status:  A

Applicability:  B

Type:  0

Definition:  A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use SHIM. For items fabricated from ceramic or electrically rated materials by specification or industry standards use INSULATOR (1), WASHER. Excludes: DISK, VALVE, graphite impregnated and lubricated items.

Basic INC:  70650

Basic Name:  WASHER

Description:  1. A perforated piece of metal, leather, or other material of various shapes and forms. It is used primarily as a seat for a bolt, nut, screw, rivet, or nail to distribute pressure and prevent endwise motion over an area, and/or to prevent movement between two parts by means of restraining features created by the shape of its edges.