The Washer,flat, cataloged under National Stock Number 5310-00-187-4083, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-187-4083 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Width Across Flats | 2.000 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-Z-325 TYPE 2 CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Nondefinitive Spec/std Data | B TYPE AND 1 GRADE AND A CLASS |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | SQUARE |
| Material | IRON AND STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Thickness | 0.1875 INCHES NOMINAL IN |
| 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 |
|---|---|
| FFW92TYPEBGRADE1CLASSA | 5/9 Secondary reference U.S. Government activity |
| FF-W-92B TY B GR I CL A | 4/1 Identification reference U.S. Government activity |
NSN 5310-00-187-4083 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5310-00-187-4085, 5310-00-187-4087, 5310-01-091-2638. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-187-4083: Width Across Flats: 2.000 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-Z-325 TYPE 2 CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Nondefinitive Spec/std Data: B TYPE AND 1 GRADE AND A CLASS. 10 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.