The Optical Flat, cataloged under National Stock Number 5210-01-306-9786, is classified within Federal Supply Class 5210 (Measuring Tools, Craftsmen's) of the Measuring Tools group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5210-01-306-9786 |
| Item Name | Optical Flat |
| FSC / FSG | 5210 / 52 — Measuring Tools, Craftsmen's |
| Status | ACTIVE |
| Design Type | WORKING DOUBLE |
| Diameter | 4.000 INCHES NOMINAL IN |
| Working Surface Flatness Accuracy | 0.00000100 INCHES NOMINAL IN |
| Material | QUARTZ |
| Thickness | 0.750 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Case | PROVIDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| D-617-4-Q-1-P | 3/2 Design control — primary reference U.S. Government activity |
| 5210PL0930748 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5210-01-306-9786 is a Optical Flat, classified under FSC 5210, Measuring Tools, Craftsmen's. Status: active.
Key specifications for 5210-01-306-9786: Design Type: WORKING DOUBLE; Diameter: 4.000 INCHES NOMINAL IN; Working Surface Flatness Accuracy: 0.00000100 INCHES NOMINAL IN; Material: QUARTZ. 6 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.