The Washer,flat, cataloged under National Stock Number 5310-01-391-2767, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Buena Park Tool & Engineering, Inc Dba Buena Park Tool. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-391-2767 |
| Primary Part Number | 13D0021-018 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Buena Park Tool & Engineering, Inc Dba Buena Park Tool |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.874 INCHES MINIMUM AND 0.882 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 304 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.641 INCHES NOMINAL IN |
| Thickness | 1.090 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 |
| Part Number | Manufacturer |
|---|---|
| 13D0021-018 | Buena Park Tool & Engineering, Inc Dba Buena Park Tool (USA) |
| Reference | Meaning |
|---|---|
| 13D0021-018 | 3/2 Design control — primary reference U.S. Government activity |
| 13D0021-018 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-391-2767 is a Washer,flat, manufactured by Buena Park Tool & Engineering, Inc Dba Buena Park Tool, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-391-2767 has 1 manufacturer part number on file: 13D0021-018 (Buena Park Tool & Engineering, Inc Dba Buena Park Tool).
Key specifications for 13D0021-018: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.874 INCHES MINIMUM AND 0.882 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-5059 MIL SPEC SINGLE 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.