The Washer,flat, cataloged under National Stock Number 5310-01-540-5438, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is C E Niehoff & Co. The record lists 5 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-540-5438 |
| Primary Part Number | N9393 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | C E Niehoff & Co |
| Status | ACTIVE |
| 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 |
|---|---|
| N9393 PRIMARY | C E Niehoff & Co (USA) |
| 25KP404 | Oshkosh Defense Llc (USA) |
| 7421528775 | Arquus (FRA) |
| MZK4848 | Paccar Parts U.k. Limited (GBR) |
| 21528775 | Volvo Lastvagnar Aktiebolag (SWE) |
| Reference | Meaning |
|---|---|
| 21528775 | 5/9 Secondary reference Volvo Lastvagnar Ab - Volvo Truckcorp |
| 25KP404 | 5/9 Secondary reference Oshkosh Corp |
NSN 5310-01-540-5438 is a Washer,flat, manufactured by C E Niehoff & Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-540-5438 has 5 manufacturer part numbers on file: N9393 (C E Niehoff & Co), 25KP404 (Oshkosh Defense Llc), 7421528775 (Arquus), MZK4848 (Paccar Parts U.k. Limited), 21528775 (Volvo Lastvagnar Aktiebolag).
Key specifications for N9393: Part Name Assigned by Controlling Agency: WASHER; End Item Identification: MRAP BUFFALO MK2A2; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS). 0 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.