The Optical Flat, cataloged under National Stock Number 5210-01-129-9262, is classified within Federal Supply Class 5210 (Measuring Tools, Craftsmen's) of the Measuring Tools group. The manufacturer of record is Van Keuren. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5210-01-129-9262 |
| Primary Part Number | OP-2B |
| Item Name | Optical Flat |
| FSC / FSG | 5210 / 52 — Measuring Tools, Craftsmen's |
| Manufacturer | Van Keuren |
| Status | ACTIVE |
| Diameter | 1.250 INCHES NOMINAL IN |
| Working Surface Flatness Accuracy | 0.00000004 INCHES NOMINAL IN |
| Material | QUARTZ |
| Thickness | 0.500 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 |
| Part Number | Manufacturer |
|---|---|
| OP-2B PRIMARY | Van Keuren (USA) |
| Reference | Meaning |
|---|---|
| 5210PL0930743 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5210-01-129-9262 is a Optical Flat, manufactured by Van Keuren, classified under FSC 5210, Measuring Tools, Craftsmen's. Status: active.
NSN 5210-01-129-9262 has 1 manufacturer part number on file: OP-2B (Van Keuren).
Key specifications for OP-2B: Diameter: 1.250 INCHES NOMINAL IN; Working Surface Flatness Accuracy: 0.00000004 INCHES NOMINAL IN; Material: QUARTZ; Thickness: 0.500 INCHES NOMINAL IN. 5 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.