Flat Washer Dimensions: 3/8
NAS1401 616 alum radius to NAS620 616 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | NAS1401 616 alum radius | NAS1401 | Anodize | 0.411 | 0.38 | Aluminum Alloy | 0.375 | 0.75 | NAS1401-616 | Regular | MIL-STD-1764 Section 303-304 | 0.065 |
| 3/8 | NAS1401 B616 steel radius | NAS1401 | Cadmium Plate | 0.411 | 0.38 | Carbon Steel | 0.375 | 0.75 | NAS1401-B616 | Regular | MIL-STD-1764 Section 303-304 | 0.065 |
| 3/8 | NAS1401 C616 cres radius | NAS1401 | Passivate | 0.411 | 0.38 | CRES | 0.375 | 0.75 | NAS1401-C616 | Regular | MIL-STD-1764 Section 303-304 | 0.065 |
| 3/8 | NAS620 616 alum reduced | NAS620 | Anodize | 0.411 | 0.38 | Aluminum Alloy | 0.375 | 0.688 | NAS620-616 | Narrow | MIL-STD-1764 Section 301-304 | 0.063 |
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