The Optical Flat, cataloged under National Stock Number 5210-00-682-1618, is classified within Federal Supply Class 5210 (Measuring Tools, Craftsmen's) of the Measuring Tools group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5210-00-682-1618 |
| Item Name | Optical Flat |
| FSC / FSG | 5210 / 52 — Measuring Tools, Craftsmen's |
| Status | ACTIVE |
| Design Type | MASTER DOUBLE |
| Diameter | 6.000 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | 1 CLASS AND 12 SIZE |
| Working Surface Flatness Accuracy | 0.00000200 INCHES NOMINAL IN |
| Material | QUARTZ |
| Thickness | 1.000 INCHES NOMINAL 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 |
|---|---|
| GG-O-635STY2CL2 | 5/9 Secondary reference U.S. Government activity |
| MIL026901CLASS1SIZE12 | 5/9 Secondary reference U.S. Government activity |
| A-A-58051 TYPE II CLASS 2 | 4/1 Identification reference Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
NSN 5210-00-682-1618 is a Optical Flat, classified under FSC 5210, Measuring Tools, Craftsmen's. Status: active.
Key specifications for 5210-00-682-1618: Design Type: MASTER DOUBLE; Diameter: 6.000 INCHES NOMINAL IN; Nondefinitive Spec/std Data: 1 CLASS AND 12 SIZE; Working Surface Flatness Accuracy: 0.00000200 INCHES NOMINAL IN. 7 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.