The Washer,flat, cataloged under National Stock Number 5310-01-116-8104, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-116-8104 |
| Primary Part Number | 409B190 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-13924 CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.593 INCHES NOMINAL IN |
| Hardness Rating | 27.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | OXIDE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4130 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.439 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN |
| Thickness | 0.126 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 |
|---|---|
| 409B190 PRIMARY | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division (USA) |
| Reference | Meaning |
|---|---|
| 10109307 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 409B190 | 5/9 Secondary reference Eaton Motor Site |
NSN 5310-01-116-8104 is a Washer,flat, manufactured by Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-116-8104 has 1 manufacturer part number on file: 409B190 (Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division).
Key specifications for 409B190: Surface Treatment Document and Classification: MIL-C-13924 CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.593 INCHES NOMINAL IN; Hardness Rating: 27.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 11 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.