The Washer,recessed, cataloged under National Stock Number 5310-00-059-5228, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Leonardo Spa Aeronautics Division - Pomigliano D'arco Site. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-059-5228 |
| Primary Part Number | MS9768-12 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Top Recess Diameter | 0.435 INCHES NOMINAL IN |
| Bottom Recess Diameter | 0.435 INCHES NOMINAL IN |
| Hardness Rating | 29.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| Top Recess Angle | 90.000 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Material Document and Classification | AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5518 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Material Thickness | 0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Bottom Recess Angle | 90.000 DEGREES NOMINAL |
| Recess Diameter | 0.435 INCHES NOMINAL IN |
| Hole Diameter | 0.378 INCHES MINIMUM AND 0.388 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 |
|---|---|
| MS9768-12 | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site (ITA) |
| Reference | Meaning |
|---|---|
| 5310PL0712488 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MS9768-12 | 2/2 Government specification standardization U.S. Government activity |
| 10437719 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-00-059-5228 is a Washer,recessed, manufactured by Leonardo Spa Aeronautics Division - Pomigliano D'arco Site, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-059-5228 has 1 manufacturer part number on file: MS9768-12 (Leonardo Spa Aeronautics Division - Pomigliano D'arco Site).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-497-3959. Verify interchangeability with system specifications before substitution.
Key specifications for MS9768-12: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Top Recess Diameter: 0.435 INCHES NOMINAL IN; Bottom Recess Diameter: 0.435 INCHES NOMINAL IN. 13 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.