The Washer,flat, cataloged under National Stock Number 5310-01-375-2878, 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 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-375-2878 |
| Primary Part Number | 4M116-12004 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Overall Diameter | 2.190 INCHES MINIMUM AND 2.220 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-R-25988,TYPE 2,CLASS 1 GRADE 40 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | RUBBER FLUOROSILICONE CLASS FQ OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.590 INCHES MINIMUM AND 1.610 INCHES MAXIMUM IN |
| Thickness | 0.104 INCHES MINIMUM AND 0.136 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 |
|---|---|
| 4M116-12004 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M116-12004 | Moeller Manufacturing & Supply, Llc (USA) |
| 4M116-12004 | Indiana Aircraft Hardware, Inc. (USA) |
| 4M116-12004 | Anillo Industries Llc (USA) |
| 4M116-12004 | Aero-Plastics, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4M116-12004 | C/1 Advisory reference — outside the item-of-supply concept Plastifab, Inc. Dba Plastifab Leed Plastics Div Plasifab Inc. |
| 4M116-12004 | 5/9 Secondary reference Jetron Inc |
| 4M116-12004 | 5/9 Secondary reference Plastifab Incorporated |
NSN 5310-01-375-2878 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-375-2878 has 5 manufacturer part numbers on file: 4M116-12004 (The Boeing Company Div Defense), 4M116-12004 (Moeller Manufacturing & Supply, Llc), 4M116-12004 (Indiana Aircraft Hardware, Inc.), 4M116-12004 (Anillo Industries Llc), 4M116-12004 (Aero-Plastics, Inc.).
Key specifications for 4M116-12004: Overall Diameter: 2.190 INCHES MINIMUM AND 2.220 INCHES MAXIMUM IN; Material Document and Classification: MIL-R-25988,TYPE 2,CLASS 1 GRADE 40 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; 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.