The Washer,flat, cataloged under National Stock Number 5310-01-474-0739, 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 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-474-0739 |
| Primary Part Number | 4M38C4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Overall Diameter | 0.312 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.125 INCHES NOMINAL IN |
| Thickness | 0.016 INCHES MINIMUM AND 0.312 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 |
|---|---|
| 4M38C4 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M38C4 | Anillo Industries Llc (USA) |
| 4M38C4 | Tect Hypervelocity, Inc. (USA) |
| 4M38C4 | All Power Manufacturing Co. (USA) |
| Reference | Meaning |
|---|---|
| 4M38 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 4M38C4 | 5/2 Secondary reference U.S. Government activity |
| 4M38C4 | 5/9 Secondary reference Pioneer Machine Products Inc. |
NSN 5310-01-474-0739 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-474-0739 has 4 manufacturer part numbers on file: 4M38C4 (The Boeing Company Div Defense), 4M38C4 (Anillo Industries Llc), 4M38C4 (Tect Hypervelocity, Inc.), 4M38C4 (All Power Manufacturing Co.).
Key specifications for 4M38C4: Overall Diameter: 0.312 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; End Item Identification: USED ON THE F/A 18E/F HORNET AIRCRAFT. 7 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.