The Washer,flat, cataloged under National Stock Number 5310-00-815-2009, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-815-2009 |
| Primary Part Number | 4M27-3 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Overall Diameter | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.097 INCHES MINIMUM AND 0.107 INCHES MAXIMUM IN |
| Thickness | 0.029 INCHES MINIMUM AND 0.035 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 |
| Part Number | Manufacturer |
|---|---|
| 4M27-3 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M27-3 | All Power Manufacturing Co. (USA) |
| 4M27-3 | Tect Hypervelocity, Inc. (USA) |
| 4M27-3 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 240695 | 5/9 Secondary reference Lockheed Martin Corp Electronics and Missiles Div |
| 4M27-3 | 5/9 Secondary reference Pioneer Machine Products Inc. |
| 4M27-3 | 5/2 Secondary reference U.S. Government activity |
| 10121727 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-00-815-2009 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-815-2009 has 4 manufacturer part numbers on file: 4M27-3 (The Boeing Company Div Defense), 4M27-3 (All Power Manufacturing Co.), 4M27-3 (Tect Hypervelocity, Inc.), 4M27-3 (Anillo Industries Llc).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-435-7115. Verify interchangeability with system specifications before substitution.
Key specifications for 4M27-3: Overall Diameter: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: CADMIUM OVERALL; Peripheral Shape Style: ROUND. 8 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.