The Washer,flat, cataloged under National Stock Number 5310-00-903-4082, 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 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-903-4082 |
| Primary Part Number | 4M27-5 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Overall Diameter | 0.438 INCHES NOMINAL IN |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1010 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.160 INCHES NOMINAL IN |
| Thickness | 0.032 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 |
|---|---|
| 4M27-5 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M27-5 | All Power Manufacturing Co. (USA) |
| 4M27-5 | Tect Hypervelocity, Inc. (USA) |
| 4M27-5 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 10121810 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 4M27-5 | 5/9 Secondary reference Pioneer Machine Products Inc. |
| 4M27-5 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-00-903-4082 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-903-4082 has 4 manufacturer part numbers on file: 4M27-5 (The Boeing Company Div Defense), 4M27-5 (All Power Manufacturing Co.), 4M27-5 (Tect Hypervelocity, Inc.), 4M27-5 (Anillo Industries Llc).
Key specifications for 4M27-5: Overall Diameter: 0.438 INCHES NOMINAL IN; Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: CADMIUM OVERALL. 9 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.