The Washer,flat, cataloged under National Stock Number 5310-00-027-3940, 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10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-027-3940 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-F-14072 FINISH E300,TYPE 1 OR TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-764 FED SPEC 2ND MATERIAL RESPONSE AND QQ-S-763 FED SPEC 3RD MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.139 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN |
| Thickness | 0.011 INCHES MINIMUM AND 0.021 INCHES MAXIMUM 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 |
|---|---|
| 410909-6 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-027-3940 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4720-01-548-3166. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-027-3940: Surface Treatment Document and Classification: MIL-F-14072 FINISH E300,TYPE 1 OR TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-763 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-764 FED SPEC 2ND MATERIAL RESPONSE AND QQ-S-763 FED SPEC 3RD MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.