Flat Washer - NAS1149F0963P
National Aerospace Standards
Description: Flat Washer
Part Number: NAS1149F0963P
Alternate Part Number: AN960-916
Product Overview
Washers are primarily used for distributing the load across a threaded fastener like a nut or a bolt. A washer can also be used for insulating steel screws from aluminum surfaces. Generally washers are made of metal and plastic and can serve many other uses such as a locking device, wear pad, or to reduce vibration especially if its a rubber washer.
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.
Specifications
| Cross-Sectional Shape Style | : | Rectangular | |
| Hole Diameter | : | 0.573" Inches minimum and 0.578" inches maximum | |
| Peripheral Shape Style | : | Round | |
| Center Hole Shape Style | : | Round | |
| Thickness | : | 0.063" Inches Nominal | |
| Overall Diameter | : | 1.057" Inches Minimum and 1.062" Inches Maximum | |
| End Item Identification | : | High-mobility artillery rocket system (himars) | |
| Material | : | Steel comp 1020 or steel comp 1025 overall | |
| Material Document and Classification | : | ClassificationMIL-S-7952 mil spec 1ST material response or astm A109 assn std 2ND material response overall | |
| Surface Treatment | : | Cadmium and chromate overall | |
| Surface Treatment Document and Classification | : | QQ-P-416 ty 2, cl 2 fed spec single treatment response overall | |
| Specification/Standard Data | : | 80205-NAS1149 professional/industrial association standard |
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