Flat Washer Dimensions: #4
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 | thickness in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| #4 | AN960_416L_steel_wide | AN960 | Cadmium Plate | 0.136 | 0.115 | Carbon Steel | 0.112 | 0.438 | AN960-416L | Wide | 0.032 |
| #4 | AN960_416_steel_regular | AN960 | Cadmium Plate | 0.136 | 0.115 | Carbon Steel | 0.112 | 0.312 | AN960-416 | Regular | 0.032 |
| #4 | MS15795_A41_alum_narrow | MS15795 | Anodize | 0.136 | 0.114 | Aluminum Alloy | 0.112 | 0.312 | MS15795-A41 | Narrow | 0.032 |
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