Flat Washer Dimensions: 5/16
NAS1401 516 alum radius to NAS620 516 alum reduced
Military-preferred flat washer dimensional data per MIL-STD-1764 Sections 301-304 — OD, ID (min/max), and thickness for flat round and flat square/radius washers by nominal bolt/screw size (#0 through 3-inch), series (Narrow/Regular/Wide), material (Aluminum Alloy, Carbon Steel, CRES), and finish. Applicable documents: AN960, NAS620, MS9320, MS15795, MS16212, NAS1401. Used for bearing area, joint stack-up, and clearance calculations in aerospace and military hardware design.
| nominal size | record id | applicable document | finish | id max in (in) | id min in (in) | material | nominal size decimal in (in) | od in (in) | part number | series | standard | thickness in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/16 | NAS1401 516 alum radius | NAS1401 | Anodize | 0.349 | 0.318 | Aluminum Alloy | 0.313 | 0.625 | NAS1401-516 | Regular | MIL-STD-1764 Section 303-304 | 0.049 |
| 5/16 | NAS1401 B516 steel radius | NAS1401 | Cadmium Plate | 0.349 | 0.318 | Carbon Steel | 0.313 | 0.625 | NAS1401-B516 | Regular | MIL-STD-1764 Section 303-304 | 0.049 |
| 5/16 | NAS1401 C516 cres radius | NAS1401 | Passivate | 0.349 | 0.318 | CRES | 0.313 | 0.625 | NAS1401-C516 | Regular | MIL-STD-1764 Section 303-304 | 0.049 |
| 5/16 | NAS620 516 alum reduced | NAS620 | Anodize | 0.349 | 0.318 | Aluminum Alloy | 0.313 | 0.562 | NAS620-516 | Narrow | MIL-STD-1764 Section 301-304 | 0.049 |
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